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International Space Flight (ESA, Russia, China and others) => Indian Launchers => Topic started by: beidou on 06/11/2017 09:53 pm

Title: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: beidou on 06/11/2017 09:53 pm
The first IRNSS launch in 2018.
Title: Re: IRNSS-1I, PSLV C3x, FLP, 2nd Half of 2017
Post by: vineethgk on 06/12/2017 12:34 am
Do we know 1I is targeted for launch this year too? I mean, its possible considering reports of more failures of atomic clocks (http://forum.nasaspaceflight.com/index.php?topic=37666.msg1688750.msg#1688750) in the constellation, but I do not know if there has been any report confirming it so far. 1H is confirmed for the second half of the year to replace 1A.
Title: Re: IRNSS-1I, PSLV C3x, FLP, 2nd Half of 2017
Post by: Steven Pietrobon on 06/14/2017 06:18 am
Do we know 1I is targeted for launch this year too?

That's what beidou is saying. This thread is for IRNSS 1I.
Title: Re: IRNSS-1I, PSLV C3x, FLP, 2nd Half of 2017
Post by: vineethgk on 06/14/2017 07:11 am
Do we know 1I is targeted for launch this year too?

That's what beidou is saying. This thread is for IRNSS 1I.
Yes. I was referring to the '2nd half of 2017' in the title of the thread. I haven't seen any sources confirming the 1I for launch this year (or I may have missed it) as the original plan was to keep it as a ground spare.
Title: Re: IRNSS-1I, PSLV C3x, FLP, 2nd Half of 2017
Post by: K210 on 06/14/2017 12:59 pm
Highly unlikely this will go up in 2017. A H1 2018 launch is more likely i think based on the fact that the construction of this satellite has been outsourced to some private company.
Title: Re: IRNSS-1I, PSLV C40, FLP, 2nd Half of 2017
Post by: vineethgk on 08/10/2017 03:56 pm
VSSC Director hints at the launch of IRNSS-1I later this year (http://m.economictimes.com/news/science/india-to-launch-spare-navigation-satellite-august-end/articleshow/60007308.cms)
Quote
The space agency plans to launch an additional space navigation satellite later this year to augment the services of the Rs 1,420 crore NavIC.

"The two spare navigation satellites will make up for any shortfall in the operations and service provided by NavIC to the users round-the-clock over the next 10 years," added Sivan.
Title: Re: IRNSS-1I, PSLV C40, FLP, 2nd Half of 2017
Post by: vineethgk on 08/10/2017 04:06 pm
There were previous reports (http://forum.nasaspaceflight.com/index.php?topic=37666.msg1710096.msg#1710096) of failure of another 3 atomic clocks across the constellation, possibly distributed across multiple satellites as none of the other satellites have been reported to be out of action as yet. IRNSS-1I might be launched to a suitable orbital inclination and location to act as backup for one of these.
Title: Re: IRNSS-1I, PSLV C40, FLP, 2nd Half of 2017
Post by: vineethgk on 09/21/2017 04:37 pm
Assembly of IRNSS-1I started, targeted for May 2018 as per original plan. No decision yet on building yet another backup (http://www.thehindu.com/sci-tech/science/work-on-at-isro-to-send-substitute-navigation-satellite/article19729325.ece)
Quote
Is the Assembly of 1I being advanced? Back in December, the consortium of six industries was given six months to work on each spacecraft. The deadline for IRNSS-1I was around May 2018. Dr. Annadurai said that as of now, the timeline was the same. The launch of 1I, when it was ready, would also have to align with ISRO’s other missions, he said.
Title: Re: IRNSS-1I, PSLV FLP, 2018
Post by: input~2 on 10/11/2017 06:57 pm
Launch not expected until 2018
Title: Re: IRNSS-1I, PSLV , FLP, 2018
Post by: K210 on 10/23/2017 01:29 pm
Payload has likely been shifted to C41 mission
Title: Re: IRNSS-1I, PSLV C41 , FLP, Q1 2018
Post by: K210 on 01/23/2018 06:03 am
Launch now set for february: https://timesofindia.indiatimes.com/city/thiruvananthapuram/s-somnath-takes-charge-as-vikram-sarabhai-space-centres-director/articleshow/62609273.cms
Title: Re: IRNSS-1I, PSLV C41 , FLP, Q1 2018
Post by: hvdh on 01/29/2018 10:02 pm
IRNSS-1I location will be the 55°E IGSO location, where IRNSS-1A and IRNSS-1B already reside. From fcc.gov:
Quote
On January 18, 2018, Intelsat License LLC was granted special temporary authority for 30 days, beginning February 1, 2018, to operate its fixed earth station in Riverside, CA to provide launch and early orbit phase (LEOP) services for the Indian Regional Navigational Satellite System (IRNSS)-1I satellite on the following center frequencies: 6415.000 MHz and 6423.496 MHz (Earth-to-space) and 4188.768 MHz and 4196.928 MHz (space-to-Earth).
The permanent orbital and in-orbit testing location for IRNSS-1I will be 55.0° E.L.
Title: Re: IRNSS-1I, PSLV C41 , FLP, end March 2018
Post by: input~2 on 02/03/2018 04:11 pm
Launch now planned for end of March
http://www.prajasakti.com/Article/Nellor/2004423
Title: Re: IRNSS-1I, PSLV C41 , FLP, March 22, 2018
Post by: vineethgk on 02/25/2018 12:18 pm
IRNSS-1I launch delayed to April

Source (http://www.thehindu.com/news/national/kerala/isro-to-launch-anotherirnss-satellite-in-april/article22845347.ece)
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 2018
Post by: Steven Pietrobon on 02/27/2018 07:33 am
IRNSS-1I launch delayed to April

Source (http://www.thehindu.com/news/national/kerala/isro-to-launch-anotherirnss-satellite-in-april/article22845347.ece)

NET is still end of March.

"The next launch will be in March end or April, but NavIC is already in full scale as four satellites are sufficient for navigation and we already have six."
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 2018
Post by: zubenelgenubi on 02/28/2018 10:03 pm
IRNSS-1I launch delayed to April

Source (http://www.thehindu.com/news/national/kerala/isro-to-launch-anotherirnss-satellite-in-april/article22845347.ece)

NET is still end of March.

"The next launch will be in March end or April, but NavIC is already in full scale as four satellites are sufficient for navigation and we already have six."

Assuming the GSAT-6A launch goes according to this schedule, before IRNSS-1I:
Launch is set for 24th March. GS1 (1st stage) and GS2 (2nd stage) integration have been completed. Cryogenic upper stage has been shipped to launch site and GSAT-6A is fully assembled undergoing final stages of testing.

Article (Telugu): http://andhrabhoomi.net/content/nation-6342

How soon could the IRNSS launch follow?  A couple of weeks? (different launch complex, different LV, how much commonality of launch campaign crews, etc.?)
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 2018
Post by: K210 on 03/01/2018 12:39 am
Quote
How soon could the IRNSS launch follow?  A couple of weeks? (different launch complex, different LV, how much commonality of launch campaign crews, etc.?)

The shortest turn around time isro has achieved so far is 18 days and that was in 2016 between GSLV F-05 and PSLV C-35. If i had to guess i would say there will be at least a 2 week gap between F-08 and C-41 missions to allow for launch site readiness and final checks to be carried out on launch vehicle and payload. C41 payload is also critical to bring the IRNSS navigation system back to full capacity so they will probably carry out additional checks further increasing the likelihood that C41 will be launched in first week of april.
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 2018
Post by: K210 on 03/21/2018 01:19 am
NOTAM:

Quote
F0817/18 NOTAMN
Q) YMMM/QWMLW/IV/BO/W/000/999/0720S09232E280
A) YMMM
B) 1804040730 C) 1804061130
D) DAILY 0730/1130
E) FLW RECEIVED FROM GOVERNMENT OF INDIA:
PSLV  YH0038/03 - ROCKET LAUNCH FROM INDIA IS NOW SCHEDULED
DANGER ZONE B BOUNDED BY

S06 42 E088 44
S10 41 E089 33
S08 08 E096 54
S04 30 E095 04 TO BEGINNING
F) SFC G) UNL

Launch is set for anytime between 4th - 6th April
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 2018
Post by: input~2 on 03/21/2018 07:17 am
NOTAM:

Quote
F0817/18 NOTAMN
Q) YMMM/QWMLW/IV/BO/W/000/999/0720S09232E280
A) YMMM
B) 1804040730 C) 1804061130
D) DAILY 0730/1130
E) FLW RECEIVED FROM GOVERNMENT OF INDIA:
PSLV  YH0038/03 - ROCKET LAUNCH FROM INDIA IS NOW SCHEDULED
DANGER ZONE B BOUNDED BY

S06 42 E088 44
S10 41 E089 33
S08 08 E096 54
S04 30 E095 04 TO BEGINNING
F) SFC G) UNL

Launch is set for anytime between 4th - 6th April

This doesn't seem to be related to IRNSS-1I launch but rather to a missile launch.
Please compare with here (https://forum.nasaspaceflight.com/index.php?topic=40764.msg1785929#msg1785929)
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: input~2 on 03/21/2018 07:29 am
Launch planned for April 12
http://www.andhrajyothy.com/artical?SID=551505
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: K210 on 03/22/2018 12:20 pm
IRNSS-1I has been shipped from ISAC to SHAR on 22nd March 2018

Source: https://www.isac.gov.in/flagoff-irnss-1I.jsp
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: Jajar on 03/30/2018 07:51 pm
They say 2 weeks from now. I’d rather they don’t hurry and do things right, rather than making a mess of it.
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: K210 on 03/31/2018 10:21 am
They say 2 weeks from now. I’d rather they don’t hurry and do things right, rather than making a mess of it.

PSLV C41 launch campaign has been ongoing for about 2 months now so they are not rushing. They will only launch when they are confident that it will succeed.
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: vineethgk on 04/01/2018 01:24 am
Considering the fatal troubles reported with GSAT-6A post-launch (https://forum.nasaspaceflight.com/index.php?topic=44050.msg1805242#msg1805242) due to on-board power or communication failure, one can expect a delay for the IRNSS-1I launch as well. ISRO folks would probably need to figure out the root causes of the GSAT-6A problems, and ensure that it would not repeat for this satellite.
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: K210 on 04/01/2018 10:40 am
Considering the fatal troubles reported with GSAT-6A post-launch (https://forum.nasaspaceflight.com/index.php?topic=44050.msg1805242#msg1805242) due to on-board power or communication failure, one can expect a delay for the IRNSS-1I launch as well. ISRO folks would probably need to figure out the root causes of the GSAT-6A problems, and ensure that it would not repeat for this satellite.

I think it best if they slowed down and worked at a more stable pace. I really think the hectic pace of things during 2016-2017 has gotten to the isro employees.

Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: vineethgk on 04/05/2018 12:26 am
PSLV-C41/IRNSS-1I launch apparently still on track for April 12 despite GSAT-6A setback (https://m.timesofindia.com/india/despite-gsat-6a-jolt-isro-gears-up-for-navigation-sat-launch-on-april-12/articleshow/63619095.cms)
Quote
Despite snapping of the communication link with its recently launched communication satellite Gsat-6A, Isro is gearing up for the scheduled launch of its next navigation satellite IRNSS-1I on April 12. Isro chairman Dr K Sivan told TOI that the "upcoming launches like of IRNSS-1I will not be affected because of the snapping of signal link with communication satellite Gsat-6A". While one team of Isro is busy with re-establishing the contact with Gsat-6A, the second team is busy in preparations for the launch of the navigation satellite, says a source in Isro.
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: worldtimedate on 04/05/2018 08:01 am
PSLV-C41/IRNSS-1I launch apparently still on track for April 12 despite GSAT-6A setback (https://m.timesofindia.com/india/despite-gsat-6a-jolt-isro-gears-up-for-navigation-sat-launch-on-april-12/articleshow/63619095.cms)
Quote
Despite snapping of the communication link with its recently launched communication satellite Gsat-6A, Isro is gearing up for the scheduled launch of its next navigation satellite IRNSS-1I on April 12. Isro chairman Dr K Sivan told TOI that the "upcoming launches like of IRNSS-1I will not be affected because of the snapping of signal link with communication satellite Gsat-6A". While one team of Isro is busy with re-establishing the contact with Gsat-6A, the second team is busy in preparations for the launch of the navigation satellite, says a source in Isro.

Since the demise of Prof. U. R. Rao last year, regarded as the father of Indian Satellite Program, ISRO has suffered two launch mission failures in barely 7 months. Had he been alive, he would've definitely advised top ISRO brass to slow down the hectic and frequent launch schedule, not to compromise the quality control in the manufacturing of the several components of launch vehicles and satellites outsourced abundantly from the private sector that can get away with impunity.

Ever since I have been tracking the launch of PSLV, not a single mission with PSLV - except the first developmental flight on September 23, 1993, the date still remembered by me - has ended up with failure. But just all on a sudden, the problems like the payload fairing not having separated, the power system having failed – have started appearing. The writing was on the wall, even though many people would not agree to that. These kind of problems that were supposed to have happened later when the complete PSLV manufacture and launching procedure were to be transferred to ISRO in 2020 have already cropped up. Because of the hectic and frequent launch schedule, stringent checking of all the components has escaped scrutiny, resulting in the mission failure.

I hope, ISRO will not botch up this IRNSS-1 mission. By the way, IRNSS should have been operationalized last year. Any further mishap will not only erode ISRO's reputation as a Space Agency, but also sully PSLV's unsullied track record of launching foreign satellites. It is better for ISRO to launch successful 7 out of 7 missions, rather than end up with two to three failure of 10 to 12 mission every year.

--- [ --- ]
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: K210 on 04/05/2018 01:33 pm
Although i am glad isro is going foward with this launch on the 12th i can only imagine the pressure the C41 project team must be under right now knowing that there is no room for failure/underperformance.....
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: vineethgk on 04/06/2018 02:36 am
No additional precautions taken for IRNSS-1I launch post-GSAT6A troubles as satellite is of different type, says VSSC Director. Launch to go ahead as scheduled on April 12.

Quote
S Somanath, director, Vikram Sarabhai Space Centre (VSSC), ISRO’s lead agency for space vehicles, said the space agency expected the PSLV C-41 mission to be a smooth one. 

"We have not taken any additional precautions as the satellite is a different type. Moreover, we had conducted a successful PSLV mission, the PSLV C-40, in January this year,” Somanath said.

Source (http://www.newindianexpress.com/cities/thiruvananthapuram/2018/apr/06/isro-gears-up-for-pslv-mission-next-week-1797613.html)
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: Steven Pietrobon on 04/06/2018 04:37 am
How do you know that the recent failures are not just coincidental? I think its impossible to know! These could be just random failures. I'm sure ISRO is doing the best job they can. When there are failures, ISRO will learn from them so that the chance of them happening again is greatly reduced.
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: Notleslie on 04/06/2018 06:12 am
NOTAM is out :)

A1116/18 NOTAMN
Q) WMFC/QWMLW/IV/BO /W /000/999/
A) WMFC B) 1804112145 C) 1804200145
D) APR 11 2145 - 2359
DLY FM APR 12 - APR 19 BTN 2145 - 2359 AND 0000 - 0145
APR 20 0000 - O145
E) TEMPO DNG AREA ESTABLISHED WI THE FLW COORD DUE TO THE LAUNCHING
OF PSLV-C41 ROCKET FM SHAR RANGE, SRIHARIKOTA, INDIA:
090500N 0945000E - 095500N 0950500E -
093500N 0960000E - 084500N 0954500E
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: Star One on 04/06/2018 06:22 am
How do you know that the recent failures are not just coincidental? I think its impossible to know! These could be just random failures. I'm sure ISRO is doing the best job they can. When there are failures, ISRO will learn from them so that the chance of them happening again is greatly reduced.

Good point well made. Disappointed to see such negativity about ISRO expressed by some, perhaps have more faith in their capabilities.
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: K210 on 04/06/2018 10:20 am
It is possible we might see high thrust vikas engine (HTVE) inducted on this pslv launch. Historically when isro has upgraded rocket engines/solid propellant motors they have discontinued the older variants. A high thrust vikas engine would enable pslv to carry 100-200 kg extra payload depending on type of orbit.
Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: K210 on 04/06/2018 03:02 pm
Launch campaign images

Source: https://www.isro.gov.in/launcher/pslv-c41-irnss-1i

Title: Re: IRNSS-1I, PSLV C41 , FLP, April 12 2018
Post by: Galactic Penguin SST on 04/06/2018 03:09 pm
Launch time is 04:04 local on April 12 = 22:34 UTC on April 11.
Title: Re: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/06/2018 04:49 pm
If this launch happens as scheduled on April 12, it would mark the shortest gap between two successive Indian orbital launches yet - 14 days.

Previous record was 18 days by GSLV-F05/PSLV-C35 and GSLV Mk3-D1/PSLV-C38 flights.

http://space.skyrocket.de/doc_lau_fam/pslv.htm

http://space.skyrocket.de/doc_lau/gslv-mk3.htm

Edit: Thanks to Gunter Krebbs!
Title: Re: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: K210 on 04/09/2018 05:42 am
Mission readiness review set for April 9th: https://www.sakshi.com/news/national/isro-pslv-c41-experiment-april-12-1061991
Title: Re: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: input~2 on 04/09/2018 08:12 am
BAY OF BENGAL, ANDAMAN SEA, PACIFIC OCEAN (.) CHARTS 32, 41, 356 INT 71 (.)
PSLV LAUNCH SCHEDULED FROM 11 – 19 APR 18 FOR 04 HRS FROM 2145 UTC
2. DANGER ZONE AS FOLLOWS
ZONE -1: CIRCLE OF 10 NM FROM 13-43.9N 080-14.2E
ZONE–2: 13-30N 080-30E, 13-50N 080-35E, 13-35N 081-30E, 13-15N 081-25E
ZONE–3: 13-00N 082-10E, 13-30N 082-15E, 12-55N 084-05E, 12-25N 084-00E
ZONE–4: 12-20N 084-05E, 13-00N 084-15E, 12-45N 085-10E, 12-05N 085-00E
ZONE–5: 11-10N 088-25E, 11-45N 088-35E, 11-25N 089-40E, 10-50N 089-30E
ZONE–6: 09-05N 094-50E, 09-55N 095-05E, 09-35N 096-00E, 08-45N 095-45E
ZONE–7: 19-00S 134-00W, 17-00S 134-00W, 13-00S 112-00W, 07-30S 090-00W,
09-30S 090-00W, 15-00S 112-00W
3. CANCEL THIS MSG 200245 UTC APR 18
Title: Re: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/09/2018 12:12 pm
Mission brochure is up!

Source (https://www.isro.gov.in/pslv-c41-irnss-1i/pslv-c41-irnss-1i-mission-brochure)
Title: Re: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/09/2018 12:58 pm
Just looked at the mission brochure; the second stage will not use the HTVE-Vac engine (846.8 kilonewtons), but rather the Vikas 2B engine (803.78 kilonewtons).
Title: Re: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: K210 on 04/09/2018 04:46 pm
Screenshots of brochure attached for convenience

 
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/10/2018 02:19 am
Just looked at the mission brochure; the second stage will not use the HTVE-Vac engine (846.8 kilonewtons), but rather the Vikas 2B engine (803.78 kilonewtons).
They may still have a few of the older Vikas-vacs lying around and may make the switch in a later flight.

An alternate possibility is that they do not intend to use the HTVE in PS2 at all, as unlike the case of GSLV MkII/III they haven't explicitly stated that they would use the new engine in a PSLV. But that would mean they would have to keep producing two different versions of Vikas-vacs which would seem like an additional overhead, not to mention the (perhaps remote) possibility of the two getting mixed up in a flight, with catastrophic results.

But I'm guessing its the former.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/10/2018 04:40 am
Well, let's say that ISRO eventually does use the HTVE-Vac in the PSLV. I think the payload capacity will be increased by a couple hundred kilograms in this scenario.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/10/2018 07:45 am
Curtain raiser video

https://www.isro.gov.in/pslv-c41-irnss-1i/pslv-c41-irnss-1i-mission-curtain-raiser-video-english
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/10/2018 11:53 am
Mission gallery (https://www.isro.gov.in/pslv-c41-irnss-1i/pslv-c41-irnss-1i-gallery) has been updated with some rather nice night time shots of the rocket on pad.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: K210 on 04/10/2018 01:34 pm
Curtain raiser video youtube mirror:

https://www.youtube.com/watch?v=TuY2KJpozRY (https://www.youtube.com/watch?v=TuY2KJpozRY)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/10/2018 04:02 pm
Quote
The 32 hr countdown activity has commenced at 20:04hr IST on Tuesday, April 10, 2018 for the launch of PSLV-C41/IRNSS-1I Mission scheduled at 04:04 hr IST on April 12, 2018
Source (https://www.isro.gov.in/update/10-apr-2018/32-hr-countdown-activity-has-commenced-2004hr-ist-tuesday-april-10-2018-launch-of)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/10/2018 05:53 pm
Quote
On addition of any new safety mechanism in IRNSS-1I to avoid power failure, the chairman said, “Power systems used in GSAT-6A and IRNSS-1I are totally different. The power system being used in IRNSS-1I is very simple and proven as all seven navigation satellites launched earlier are working successfully.”
Source (https://m.timesofindia.com/india/we-now-knows-exact-location-of-gsat-6a-communication-satellite-says-isro-chief/articleshow/63701803.cms)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: catdlr on 04/11/2018 05:45 am
India ISRO : Rocket Launch of PSLV-C41/IRNSS-1I Mission


space googlevesaire
Scheduled for Apr 11, 2018

https://www.youtube.com/watch?v=FpjoU226xnc?t=001

https://www.youtube.com/watch?v=FpjoU226xnc
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 06:01 am
The countdown has started. We are barely 17 hours away for the launch of PSLV C41 - IRNSS-1I Mission.

PSLV C41 - IRNSS-1I Mission Countdown (http://---countdown/create_countdown_action.php?event=PSLV-C41+-+IRNSS-1I+Launch&month=4&day=11&year=2018&hour=22&minute=34&second=0)

--- [ --- ]
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Chris Bergin on 04/11/2018 01:49 pm
William Graham's launch article!
https://www.nasaspaceflight.com/2018/04/indias-pslv-rocket-irnss-1i/
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 09:34 pm
One hour until launch.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 09:51 pm
https://www.isro.gov.in/pslv-c41-irnss-1i/launch-of-pslv-c41-irnss-1i-mission

On ISRO's website, the webcast is technically up, but it's showing static shots of the Mission Control Centre's interior.

Actual coverage will start at 22:00 UTC.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 09:57 pm
Countdown is in progress, obviously.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 09:58 pm
PSLV-C41/IRNSS-1I Live Telecast on April 12, 2018 from 03:30 Hrs
https://www.youtube.com/watch?v=-ku-PVhskyo
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:00 pm
Coverage should start any time now.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:01 pm
And we're live from the Satish Dhawan Space Centre. In about 34 minutes, the Indian Space Research Organisation will launch their 43rd Polar Satellite Launch Vehicle and the ninth Indian Regional Navigation Satellite System spacecraft into a sub-geosynchronous transfer orbit. The planned T0 time is 22:34 UTC, or 4:04 AM Indian Standard Time.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:02 pm
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:04 pm
Base of vehicle. Commentator describing mission.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:04 pm
The commentators for this mission.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:04 pm
Under a half hour to launch.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:05 pm
T-30 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 10:05 pm
And we're live from the Satish Dhawan Space Centre. In about 34 minutes, the Indian Space Research Organisation will launch their 43rd Polar Satellite Launch Vehicle and the ninth Indian Regional Navigation Satellite System spacecraft into a sub-geosynchronous transfer orbit. The planned T0 time is 22:34 UTC, or 4:04 AM Indian Standard Time.

Coverage has started.

1 )
https://www.isro.gov.in/pslv-c41-irnss-1i/launch-of-pslv-c41-irnss-1i-mission

2 )
https://www.youtube.com/watch?v=-ku-PVhskyo
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:06 pm
Mission controllers in their positions, including ISRO's chairman.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:07 pm
Weather conditions are clear and preferable for launch.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:08 pm
Targeted orbital parameters at spacecraft separation:

Perigee: 284 kilometers
Apogee: 20,650 kilometers
Inclination: 19.2 degrees
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:08 pm
The ISRO page is showing the correct aspect ratio.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:09 pm
Explaining how ISRO uses weather balloons to monitor upper-level winds.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Chris Bergin on 04/11/2018 10:09 pm
Through the trees.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:10 pm
T-25 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:13 pm
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:15 pm
T-20 minutes. Showing launch preparation.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:15 pm
Showing the assembly of the launch vehicle.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:16 pm
Preparing satellite.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:17 pm
Payload encapsulation and MST rollback.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 10:17 pm
T-18 Seconds. in the next minutes, authorization will be given.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:17 pm
Current status.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:19 pm
The launch authorization key has been turned. Terminal Count should start pretty soon.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:19 pm
Under 15 minutes to launch.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:20 pm
Turning key.

T-15 minutes. Launch authorised.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:20 pm
Terminal Count has officially started.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:21 pm
Now showing a promo video for the IRNSS 1I payload.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:23 pm
T-12 minutes. Showing another video.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:24 pm
T-10 minutes. Weighing 1,425 kilograms, IRNSS 1I (like the other seven satellites in the constellation) will transmit signals for the determination of position, navigation, and time.

Although IRNSS 1I will be the ninth in the constellation to be launched, it will actually be the eighth to enter service since IRNSS 1H got stranded in Low Earth Orbit after the heat shield failed to jettison.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:25 pm
T-10 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:26 pm
T-9 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:27 pm
T-8 minutes. Showing launch animation.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:28 pm
T-7 minutes. Planned orbit.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:28 pm
T-6 minutes. IRNSS 1I should be on internal power by now.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:29 pm
T-6 minutes. IRNSS constellation.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:29 pm
T-5 minutes. Still proceeding towards an on-time liftoff at 22:34 UTC.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:30 pm
T-5 minutes. IRNSS applications.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:30 pm
T-4 minutes. At liftoff, the four PSOM-XL boosters and S-138 first stage will produce a liftoff thrust of 6,819.1 kilonewtons, or 1,532,994.67 pounds.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:31 pm
T-4 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:31 pm
T-3 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:31 pm
T-3 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:32 pm
T-2 minutes. No technical issues being worked. Weather also remains favorable.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:33 pm
T-2 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:33 pm
T-90 seconds.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:33 pm
T-1 minute. The second and fourth stages should be pressurizing to flight level.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:34 pm
T-1 minute.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:34 pm
T-30 seconds. Go PSLV, Go IRNSS.

Igniters being armed.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:34 pm
T-15.

10, 9, 8, 7, 6, 5, 4, 3, 2, 1, ignition and liftoff of the PSLV-XL rocket with IRNSS 1I, continuing to provide positioning, navigation, and timing services for Indian residents.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:35 pm
Liftoff!
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:35 pm
T+25 seconds. We've ignited the air-starts on time. Vehicle beginning to go supersonic.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:35 pm
T+40 seconds. We're now reaching the period of maximum dynamic pressure as all four ground-starts begin to tail off.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Chris Bergin on 04/11/2018 10:35 pm
LAUNCH!
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:35 pm
T+1 minute, 10 seconds. We have good separation of all four ground-start motors and the air-starts are now burning out.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:36 pm
T+1 minute.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:36 pm
T+90 seconds. And there's jettison of both air-start motors. First stage continues to burn well.

First stage burnout should occur at the 107-second point, followed by staging and second stage engine start one second later.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:36 pm
T+1 minute, 50 seconds. The first stage has burnt out and separated. The Vikas 2B engine has ramped up to full thrust.

Second stage will burn for about 154 seconds until the 264-second point.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 10:36 pm
Lift-off is normal.
First Stage performance is normal.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:37 pm
T+2 minutes. First stage separation and second stage ignition.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:37 pm
Now two and a half minutes into the flight of IRNSS 1I. Vehicle attitude is nominal; second stage propulsion is looking good.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Chris Bergin on 04/11/2018 10:37 pm
Interesting solids sep
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:37 pm
Three minutes in. Heat shield jettison in about twenty seconds.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:37 pm
T+3 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:38 pm
And we have heat shield jettison. With that event occurring successfully, the PSLV now weighs just 11% of its liftoff weight (34.22 tons compared to 310 tons).
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 10:38 pm
First Stage has been separated.

Second stage has ignited.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:38 pm
Coming up on SECO momentarily.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/11/2018 10:38 pm
Aaaargh... The camera man zoomed in on people's faces in MCC when they had the airlit strapon separation and PS1 separation events..
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:39 pm
We have SECO, second stage separation, and third stage ignition. Third stage will burn for 112 seconds.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:39 pm
Fairing separation.

T+4 minutes.

Second stage separation. Third stage ignition.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:39 pm
T+5 minutes. Third stage propulsion healthy; trajectory also is nominal.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:40 pm
T+5 minutes. Third stage performance normal.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:40 pm
Nominal flight so far.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:40 pm
Third stage has now burnt out. Between the burnout and third stage separation, there will be a 222-second coast phase. Ten seconds after third stage separation, the two fourth stage engines will start up.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:41 pm
T+6 minutes.

Third stage cutoff.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:41 pm
Coast phase is as expected.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:41 pm
T+7 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:42 pm
Very close to preflight predictions.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:43 pm
T+8 minutes. Still coasting.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:43 pm
According to the onboard rocketcam, PSLV has seen its first sunrise.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:44 pm
T+9 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:44 pm
T+10 minutes. Third stage has separated from the fourth stage. Standing by for engine start.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:44 pm
Engine start has been confirmed. This single burn of the fourth stage will last 514 seconds until T+1123 seconds.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:45 pm
T+10 minutes. Third stage separation.

Fourth stage ignition.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 10:45 pm
Third stage has seprated at 597 secnods. Fourth stage has ignited at 600 seconds. Fourth Stage performance is normal.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:45 pm
Fourth stage propulsion healthy.

PSLV is orbital.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:46 pm
T+11 and a half minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:46 pm
T+11 minutes. Fourth stage performance normal.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:46 pm
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:47 pm
T+12 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:47 pm
Five and a half minutes of powered flight remaining.

Fourth stage performance continues to be normal.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:48 pm
T+13 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:48 pm
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:49 pm
T+15 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:49 pm
T+15 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 10:50 pm
Fourth Stage performance is normal. The vehicle is at 3444.1 km downrange, at Altitude of 201.4 km, and azimuth of 104.8 degree
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:50 pm
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:50 pm
T+16 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:51 pm
Flight of the PSLV continues to be normal.

Both fourth stage engines still producing the required thrust to inject the IRNSS 1I satellite into the sub-GTO orbit.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:52 pm
T+17 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:52 pm
Coming up on fourth stage engine shutdown.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:52 pm
T+18 minutes.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:53 pm
T+18 minutes, 43 seconds. Fourth stage engine shutdown confirmed.

Actual orbital parameters:

Perigee: 281.5 kilometers
Apogee: 20,730 kilometers
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:53 pm
PS4 cutoff!
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 10:53 pm
Fourth Stage Engine is cutoff.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:54 pm
Spacecraft separation!
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:54 pm
T+19 minutes, 20 seconds. Payload deployment has occurred. And the Launch Conductor has announced a mission success.

Congrats to the Indian Space Research Organisation on the successful execution of PSLV-C41.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:54 pm
Great separation shot.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:55 pm
Commentators signing off for tonight.

Post-launch speeches coming up.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Chris Bergin on 04/11/2018 10:55 pm
S/C Sep!

Updated Article: https://www.nasaspaceflight.com/2018/04/indias-pslv-rocket-irnss-1i/ - by William Graham

Great coverage everyone, notably Steven and Zach.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: northenarc on 04/11/2018 10:55 pm
 Congrats to ISRO

Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:56 pm
Small crowd this early in the morning!
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: SciNews on 04/11/2018 10:56 pm
PSLV-XL launches IRNSS-1I satellite
https://www.youtube.com/watch?v=DxhDH8CoQTs
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:58 pm
ISRO Chairman announcing successful launch.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 10:58 pm
Dr. K. Sivan, chairman of ISRO.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: northenarc on 04/11/2018 10:58 pm
 Did he get promoted? Cool
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 10:59 pm
Vehicle is using friction stir welding.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: worldtimedate on 04/11/2018 11:01 pm
Payload has been separated. Mission has been declared a success
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 11:02 pm
R. Hutton, Mission Director.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:02 pm
Mission Director. 281.5 x 20730 km orbit.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: northenarc on 04/11/2018 11:03 pm
 PTI stream has ended
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:05 pm
VSSC Director.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 11:06 pm
S. Somanath, VSSC Director.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:06 pm
SDSC SHAR Director. Shortest time between two launches.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 11:07 pm
Dr. M. Annadurai, ISAC Director.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:07 pm
ISAC Director. Solar arrays deployed and receiving commands.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:09 pm
Satellite Director.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 11:11 pm
Dr. V. Narayanan, LPSC Director.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:11 pm
LPSC Director. FSW propellant tanks worked well. Spacecraft systems all performing well.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:11 pm
IPRC Director.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 11:12 pm
S. Pandian, IPRC Director.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 11:13 pm
Dr. Sam Dayala Dev, IISU Director.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:13 pm
IISU Director. Inclination accuracy to three decimal places.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 11:13 pm
The ISRO chairman back at the podium to provide some closing words.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:14 pm
ISRO Chairman wrapping up. Initial IRNSS constellation has been completed.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: ZachS09 on 04/11/2018 11:15 pm
And that's the end of tonight's show!

I'll see you next time!
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Steven Pietrobon on 04/11/2018 11:16 pm
Coverage ending. Congratulations to ISRO for the successful launch!
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/11/2018 11:16 pm
As a welcome change, the speeches were shorter this time.. :)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/11/2018 11:24 pm
Thanks Steven, Zach and Chris!

If I heard it right, this mission had the 107th Vikas and 86th PS4 engine.

Friction stir welding was used in propellant tanks for the first time.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/12/2018 02:08 am
Press release is out
Quote
PSLV-C41 Successfully Launches IRNSS-1I Navigation Satellite

In its forty third flight, ISRO’s Polar Satellite Launch Vehicle PSLV-C41 successfully launched the 1425 kg IRNSS-1I Navigation Satellite today (April 12, 2018) from Satish Dhawan Space Centre SHAR, Sriharikota.
PSLV-C41 lifted off at 0404 hrs (4:04 am) IST, as planned, from the First Launch Pad.  After a flight lasting about 19 minutes, the vehicle achieved a Sub Geosynchronous Transfer Orbit with a perigee (nearest point to earth) of 281.5 km and an apogee (farthest point to earth) of 20,730 km inclined at an angle of 19.2 degree to the equator following which IRNSS-1I separated from PSLV.
After separation, the solar panels of IRNSS-1I were deployed automatically. ISRO's Master Control Facility (MCF) at Hassan, Karnataka took over the control of the satellite. In the coming days, orbit manoeuvres will be performed from MCF to position the satellite at 55 deg East longitude in the planned Geosynchronous Orbit with an inclination of 29 deg to the equator.
IRNSS-1I is the latest member of the ‘Navigation with Indian Constellation (NavIC)’ system.  NavIC, also known as Indian Regional Navigation Satellite System (IRNSS), is an independent regional navigation satellite system designed to provide position information in the Indian region and 1500 km around the Indian mainland.
A number of ground facilities responsible for IRNSS satellite ranging  and monitoring, generation and transmission of navigation parameters, satellite control, network timing, etc., have been established in many locations across the country as part of NavIC.
Till now, PSLV has successfully launched 52 Indian satellites and 237 customer satellites from abroad.
Source (https://www.isro.gov.in/update/12-apr-2018/pslv-c41-successfully-launches-irnss-1i-navigation-satellite)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/12/2018 02:16 am
... and the launch pics ....

Source (https://www.isro.gov.in/irnss-programme/pslv-c41-irnss-1i-gallery)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/12/2018 02:44 am
Lift off and onboard camera footage

https://www.isro.gov.in/irnss-programme/pslv-c41-liftoff-and-onboard-camera-view

Edit - Underwhelming as usual. They haven't included the lovely footage with fireworks before the strapons separated or after the PS1 separated. Just the IR views.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/12/2018 03:08 am
An amateur footage as seen from Chennai (I think)

https://www.youtube.com/watch?v=rGfZ45EoOnI

Apparently clouds were playing spoil sport.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/12/2018 03:15 am
YT link with complete launch replay.

https://www.youtube.com/watch?v=wIPw5GzIu_A
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/12/2018 03:18 am
Another amateur footage taken from near the SDSC-SHAR staff quarters I guess.

https://www.youtube.com/watch?v=o4sufltdrZU
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: K210 on 04/12/2018 04:23 am
Onboard camera footage:

https://www.youtube.com/watch?v=6T7xga0H5Wo (https://www.youtube.com/watch?v=6T7xga0H5Wo)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: input~2 on 04/12/2018 07:37 am
2 objects have been cataloged

2018-035A/43286 in 271 x 20661 km x 19.20°
2018-035B/43287 in 270 x 20944 km x 19.11°
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/12/2018 10:32 am
A few more shots added to the gallery later.. The last one could almost be mistaken for a missile launch in the first look.  ;)

Source (https://www.isro.gov.in/irnss-programme/pslv-c41-irnss-1i-gallery)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/12/2018 11:38 am
Details for first planned burn
Quote
Apr 12, 2018 : The first orbit raising operation of IRNSS-1I is planned to be carried out at 4:15 hr IST on April 13, 2018. The targeted perigee height is 322 km and apogee height is 35887 km
Source (https://www.isro.gov.in/update/12-apr-2018/first-orbit-raising-operation-of-irnss-1i-planned-to-be-carried-out-415-hr-ist)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/13/2018 01:43 am
Quote
The first orbit raising operation of IRNSS-1I is successfully carried out at 4:19 hr IST on April 13, 2018

The achieved perigee height is 315 km and apogee height is 35809 km.

The second orbit raising operation of IRNSS-1I is planned to be carried out around 20:00 hr IST on April 13, 2018. The targeted perigee height is 8536 km and apogee height is 35793 km.
Source (https://www.isro.gov.in/update/13-apr-2018/first-orbit-raising-operation-of-irnss-1i-successfully-carried-out-419-hr-ist)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/13/2018 05:07 pm
Quote
The second orbit raising operation of IRNSS-1I is successfully carried out at 20:04 hr IST on April 13, 2018
Source (https://www.isro.gov.in/update/13-apr-2018/second-orbit-raising-operation-of-irnss-1i-successfully-carried-out-2004-hr-ist)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/14/2018 01:51 am
New orbital parameters for IRNSS-1I after the previous (second) burn of LAM.

Quote
The achieved perigee height is 8683 km and apogee height is 35733 km.

The third orbit raising operation of IRNSS-1I is planned to be carried out at around 22:45 hr IST on April 14, 2018. The targeted perigee height is 31,540 km and apogee height is 35,797 km.
Source (https://www.isro.gov.in/update/14-apr-2018/second-orbit-raising-operation-of-irnss-1i-satellite-has-been-successfully)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: boldz on 04/15/2018 01:04 am
The third orbit raising operation of IRNSS-1I is successfully carried out at 22:50 hr IST on April 14, 2018. The achieved perigee height is 31,426 km and apogee height is 35,739 km
The fourth and the final orbit raising operation of IRNSS-1I is planned to be carried out at around 21:20 hr IST on April 15, 2018.  The targeted perigee height is 35,381 km and apogee height is 35,793 km.

https://www.isro.gov.in/update/15-apr-2018/third-orbit-raising-operation-of-irnss-1i-successfully-carried-out-2250-hr-ist
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: Olaf on 04/15/2018 05:44 pm
https://www.isro.gov.in/update/15-apr-2018/fourth-and-final-orbit-raising-operation-of-irnss-1i-successfully-carried-out
Quote
The fourth and the final orbit raising operation of IRNSS-1I is successfully carried out at 21:05 hr IST on April 15, 2018.
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: vineethgk on 04/15/2018 11:06 pm
Orbital parameters updated after final burn
Quote
The fourth and the final orbit raising operation of IRNSS-1I is successfully carried out at 21:05 hr IST on April 15, 2018. The achieved perigee height is 35,462.9 km and apogee height is 35,737.8 km
Source (https://www.isro.gov.in/update/15-apr-2018/fourth-and-final-orbit-raising-operation-of-irnss-1i-successfully-carried-out)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: input~2 on 04/17/2018 08:06 pm
Orbital parameters updated after final burn
Quote
The fourth and the final orbit raising operation of IRNSS-1I is successfully carried out at 21:05 hr IST on April 15, 2018. The achieved perigee height is 35,462.9 km and apogee height is 35,737.8 km
Source (https://www.isro.gov.in/update/15-apr-2018/fourth-and-final-orbit-raising-operation-of-irnss-1i-successfully-carried-out)
Well, at epoch April 15 17:18 UTC (22:48 IST) NORAD had it in an orbit of 33,150 x 35,980 km x 28.34° 
and from last available TLE, at epoch April 16 17:26 UTC, in an orbit of 35,843 x 36,308 km x 28.55°

Is NORAD tracking the right object or is everything OK with the satellite?
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: K210 on 04/18/2018 12:38 pm
Good to see IRNSS-1I has reached a geostationary orbit without any problems
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: eeergo on 04/18/2018 02:40 pm
Good to see IRNSS-1I has reached a geostationary orbit without any problems

1I is in an inclined geosynchronous orbit (not geostationary) - but I second the sentiment :)
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: input~2 on 04/18/2018 04:26 pm
Table of periods derived from all TLEs published as of today

EPOCH                              PERIOD
2018-04-11 19:53:39    6h 02m 23s
2018-04-12 01:54:53    6h 02m 36s
2018-04-12 10:45:28    6h 02m 36s
2018-04-12 21:29:07    6h 02m 36s
2018-04-13 08:26:21    10h 32m 01s
2018-04-14 15:49:57    13h 21m 40s
2018-04-15 17:18:22    22h 54m 08s
2018-04-16 17:03:42    28h 36m 11s
2018-04-16 17:26:10    24h 10m 51s

Geosynchronous period is 23h 56m 04s
Title: Re: LIVE: IRNSS-1I - PSLV-XL (C41) - April 11, 2018 (22:34 UTC)
Post by: input~2 on 04/30/2018 07:15 pm
Orbital period is now 23h56m09s