Author Topic: PSLV-QL C48 - RISAT-2BR1 & 9 cubesats - FLP - 11 December 2019 (09:55 UTC)  (Read 26601 times)

Offline zubenelgenubi

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RISAT-2BR1

Launch scheduling; cross-post:
Quote
https://www.thehindu.com/sci-tech/science/isro-launches-to-resume-in-october-sivan/article29363065.ece
ISRO would take up Cartosat-3, a high-resolution earth observation satellite, in October. Within a week of it it would launch RISAT-2BR1.
https://www.business-standard.com/article/current-affairs/orbiter-s-life-to-be-7-years-as-it-now-has-extra-fuel-isro-chief-k-sivan-119090900010_1.html
Quote
Future programmes will go as planned. Starting with the Cartosat-3 launch by the end of October, followed by RISAT-2BR1 within a week of the Cartosat launch. <snip>

To achieve this launch cadence, would launch be from the FLP?  (Assuming Cartosat-3 is launched from the SLP.)

And, deducing from the payload mass of 615 kg, launching to an 37 deg. inclined low Earth orbit, the launcher version should be Core Alone?  RISAT-2B launched on a PSLV-CA.
« Last Edit: 12/11/2019 08:18 am by input~2 »
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Online ZachS09

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Re: RISAT-2BR1 - PSLV-CA C48 - October or November 2019
« Reply #1 on: 09/11/2019 09:19 pm »
If RISAT 2BR1 is launching by itself, then it would make sense for the Core-Alone variant to be used.

I mean, why would ISRO attach PSOMs on the rocket if itís a light payload?
« Last Edit: 09/11/2019 09:19 pm by ZachS09 »
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Offline zubenelgenubi

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Cross-post:
https://spaceflight.com/spaceflight-announces-next-three-rideshare-missions-on-isros-pslv-slated-through-the-end-of-2019/
Presser:

Spaceflight Announces Next Three Rideshare Missions on ISROís PSLV, Slated Through the End of 2019

The rideshare service provider will launch 14 customer satellites from four different organizations on the next three launches

SEATTLE Ė Oct. 15, 2019 Ė Spaceflight, the leading satellite rideshare and mission management provider, today announced it will launch 14 more spacecraft from Indiaís Polar Satellite Launch Vehicle (PSLV) this year. Payloads will launch on PSLVís C47, C48 and C49 missions, scheduled to launch in November and December 2019 from Indiaís Satish Dhawan Space Center. Customers aboard the missions include Analytical Space, Spire, iQPS and Kleos Space.
<snip>
PSLV C48, slated for early December, will carry Japanís iQPS SAR microsatellite and four multi-payload Earth observation nanosatellites that add to Spire Global's constellation of maritime, aviation and weather monitoring satellites.
« Last Edit: 10/21/2019 06:51 pm by zubenelgenubi »
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Offline zubenelgenubi

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As of today's successful launch of Cartosat-3 et al., this should be the next launch.

A tantalizing statement...
ISRO Chairman giving final congratulations. Coming back "very soon."
« Last Edit: 11/27/2019 04:00 am by zubenelgenubi »
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Offline K210

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Given the delay with this launch they might launch RISAT-2BR1 and RISAT-2BR2 together on a single pslv. Assuming similar launch mass to RISAT-2B (615kg) this would require about ~1200 kg to LEO. PSLV-CA can place a 2100kg payload into a eastly 620 km LEO.

Offline TheVarun

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this would require about ~1200 kg to LEO. PSLV-CA can place a 2100kg payload into a eastly 620 km LEO.

   PSLV-CA may be able to take a 1200kg payload to LEO, but a 2100kg- I think the PSLV-XL( with 6*12 tonne strap ons) would be needed.  BTW, why is there an uneven match between 'vehicles and missions'?  ISRO is saying things like '6 vehicles and 7 missions"  Doesn't one rocket count as one mission, even if it is carrying multiple satellites?  Or are they referring to Arianespace's launching of Indian satellites, when referring to the extra mission?

Offline K210

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Quote
I think the PSLV-XL( with 6*12 tonne strap ons) would be needed.

The PSLV-XL can place 3800 kg into 620 km eastly LEO. It would be overkill for a mission that only requires around ~1200 kg of performance hence why i stated CA variant in my post. For reference the LEO payload capacities of the various PSLV configs are: 2100 Kg (CA), 3250 kg (G) and 3800 kg (XL).

Quote
Or are they referring to Arianespace's launching of Indian satellites, when referring to the extra mission?

This is probably the case. GSAT-30 has been waiting for a ride on Ariane-V for some time now.


Offline zubenelgenubi

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Are the RISAT-2BRs designed to "stack" under the payload fairing?  One would have to be constructed to bear the weight of the other through the rigors of launch.

Or, does ISRO have a SYLDA-like device for dual co-payloads?

If the answer to both of my questions is no, then I deduce that both RISAT-2BRs cannot be launched on the same PSLV, in the immediate future (now to the end of the year).
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Offline tehwkd

FLP confirmed,

11dec 0930-1130 UTC
12dec 0900-1100 UTC
13dec 0830-1030 UTC


Quote
A2802/19 - PSLV-C48 ROCKET LAUNCH FM SHAR RANGE, SRIHARIKOTA WILL TAKE PLACE AS PER FLW DETAILS.THE LAUNCH WILL BE ON ANY ONE OF THE DAY DRG THIS PERIOD. ACTUAL DATE OF LAUNCH WILL BE INTIMATED 24 HR IN ADVANCE THRU A SEPARATE NOTAM. LAUNCH PAD COORD: 1343.9N08014.2E. NO FLT IS PERMITTED OVER THE DNG ZONES. A.) DNG ZONE 1: A CIRCLE OF 10NM AROUND THE LAUNCHER. B.) DNG ZONE 2: A SECT BTN 25NM AND 90NM FM LAUNCH PAD COORD AND BTN AZM ANGLES 130DEG AND 150DEG FM TRUE NORTH. C.) DNG ZONE 3: AREA ENCLOSED BY THE FLW COORD: I) 1035N08215E II) 1105N08245E III) 1020N08320E IV) 0950N08250E D.) DNG ZONE 4: AREA ENCLOSED BY FLW COORD: I) 0830N08340E II) 0900N08410E III) 0755N08455E IV) 0725N08425E E.) DNG ZONE 5: AREA ENCLOSED BY FLW COORD: I) 0605S09150E II) 0505S09305E III) 0705S09405E IV) 0805S09250E F.) DNG ZONE 6: AREA ENCLOSED BY FLW COORD: I) 4700S15500W II) 4200S15500W III) 3400S14000W IV) 3015S13110W V) 3515S13110W ALL COORD ARE IN DEG AND MIN. RTE AFFECTED IN CHENNAI FIR- W20,Q24,V4,Q23,V9,A465,P761,P574,B466,N564,L896,N563,T3,V3,V6,V8, Q10 AND Q11 END PART 1 OF 3. 11 0930-1130, 12 0900-1100 AND 13 0830-1030, 11 DEC 09:30 2019 UNTIL 13 DEC 10:30 2019. CREATED: 29 NOV 10:42 2019

F3522/19 - ROCKET LAUNCH WILL TAKE PLACE FLW RECEIVED FROM GOVERNMENT OF INDIA: PSLV C48 ROCKET LAUNCH FROM INDIA IS NOW SCHEDULED SPLASHDOWN DANGER ZONE BOUNDED BY 0605S 09150E 0505S 09305E 0705S 09405E 0805S 09250E. SFC - UNL, 1912110930 TO 1912111130 1912120900 TO 1912121100 1912130830 TO 1912131030, 11 DEC 09:30 2019 UNTIL 13 DEC 10:30 2019. CREATED: 29 NOV 20:27 2019

« Last Edit: 11/30/2019 02:28 pm by tehwkd »
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Offline chota

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^
No dog leg manoeuvre?

Offline zubenelgenubi

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No dog leg manoeuvre?

Apparently, no.  RISAT-2B launched into a 37 degree inclination orbit.

However, by visual inspection, the NOTAMs appear to map an ascent to a somewhat greater orbital inclination?  This also occurred for RISAT-2B.

Also noting that the 2-hour NOTAM window shifts forward 30 minutes/day.

Will RISAT-2B, 2BR1, and 2BR2, once all are operational, be a 3 satellite constellation, orbits of 37 deg inclination, but with the ascending nodes of each orbit separated by 120 deg?
***

Also, noting that this launch could occur a minimum of 14 days after C47!
« Last Edit: 12/03/2019 04:57 am by zubenelgenubi »
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Offline K210

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Are the RISAT-2BRs designed to "stack" under the payload fairing?  One would have to be constructed to bear the weight of the other through the rigors of launch.

Or, does ISRO have a SYLDA-like device for dual co-payloads?

If the answer to both of my questions is no, then I deduce that both RISAT-2BRs cannot be launched on the same PSLV, in the immediate future (now to the end of the year).

ISRO has been able to launch multiple primary payloads on PSLV for a couple of years now. For example in the C28 mission they launched three 450 kg satellites together as the primary payload. I suspect the reason why they are only launching a single RISAT-2BR sat probably has to do with payload readiness and pressure from certain "entities".


Offline zubenelgenubi

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Cross-post from the C46 launch thread:
Drawing of RISAT 2B from the press kit. Looks like a large deployable antenna on top of the vehicle. Mass is 615 kg to 557 km 37į orbit. Radar frequency is X-Band. Applications include agriculture, forestry and disaster management support.
« Last Edit: 12/01/2019 06:16 pm by zubenelgenubi »
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Offline input~2

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Offline whiztech

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The configuration is PSLV-QL and scheduled for 09:55 UTC

https://www.isro.gov.in/launcher/pslv-c48-risat-2br1

Offline zubenelgenubi

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Interesting re: adding four PSOMs

Does adding first stage performance leave more delta-v for the PS4 after the deployment of RISAT-2BR1?

For instance, will the operational orbit for QPS-SAR 1 differ from that of RISAT-2BR1?  Delta-v could be for orbit raising or lowering to deploy a secondary payload before the 4th stage end of mission.
« Last Edit: 12/04/2019 05:57 pm by zubenelgenubi »
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Online ZachS09

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Interesting re: adding four PSOMs

Does adding first stage performance leave more delta-v for the PS4 after the deployment of RISAT-2BR1?

For instance, will the operational orbit for QPS-SAR 1 differ from that of RISAT-2BR1?  Delta-v could be for orbit raising or lowering to deploy a secondary payload before the 4th stage end of mission.

Yes, it does. The more PSOMs you attach, the more delta-v the fourth stage gets after initial orbit insertion. What bothers me is the fact that the total payload mass is within the CA's capability (between 600 and 700 kg), yet a slightly-more powerful PSLV is being used for this mission.
« Last Edit: 12/04/2019 06:05 pm by ZachS09 »
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Offline zubenelgenubi

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Further from https://www.isro.gov.in/launcher/pslv-c48-risat-2br1
Quote
PSLV-C48 will also carry 9 customer satellites of Israel(1), Italy(1), Japan(1) and USA(6) as co-passengers. These international customer satellites are being launched under a commercial arrangement with NewSpace India Limited (NSIL).

We know the identities of five secondary payloads:
QPS-SAR 1 is the Japanese payload, massing circa 100 kg with a 3.6 m unfurling antenna.

Four of the six USA satellites are Lemur-2 cubesats.

What are the remaining two USA satellites, and the one each from Israel and Italy?
***

ADD re: NOTAM counting and comparing to the previous PSLV-QL launch:
There are five dropzones, one more than needed for a core-alone launch.  (unless the Pacific drop zone was for the fourth stage--apparently not so)
« Last Edit: 12/04/2019 06:56 pm by zubenelgenubi »
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Offline whiztech

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Offline zubenelgenubi

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What are the remaining two USA satellites, and the one each from Israel and Italy?
Launch kit

Israel, Space Laboratory of the Herzliya Science Centre (HSC): Duchifat-3, 3U cubesat

USA, Hera Systems: 1HOPSat TD, 12U cubesat, 22 kg

USA: Tyvak-0129, multiU cubesat (technology demonstration)

Italy: Tyvak-0092, ?U cubesat (search and rescue)
« Last Edit: 12/05/2019 05:41 pm by zubenelgenubi »
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Offline Skyrocket

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What are the remaining two USA satellites, and the one each from Israel and Italy?
Launch kit

Israel, Space Laboratory of the Herzliya Science Centre (HSC): Duchifat-3, 3U cubesat

USA, Hera Systems: 1HOPSat TD, 12U cubesat, 22 kg

USA: Tyvak-0129, multiU cubesat (technology demonstration)

Italy: Tyvak-0092, ?U cubesat (search and rescue)

Tyvak-0129 is likely PTD-1 (https://space.skyrocket.de/doc_sdat/ptd-1.htm ), a 6U cubesat

Tyvak-0092 is a 3U Cubesat, likely COMMTRAIL
« Last Edit: 12/05/2019 11:29 pm by Skyrocket »

Offline K210

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It is strange they went for a QL variant when payload mass is within CA's payload capacity. Maybe excess S12 solid motors lying around?
« Last Edit: 12/05/2019 07:35 pm by K210 »

Offline zubenelgenubi

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What bothers me is the fact that the total payload mass is within the CA's capability (between 600 and 700 kg), yet a slightly-more powerful PSLV is being used for this mission.
It is strange they went for a QL variant when payload mass is within CA's payload capacity. Maybe excess S12 solid motors lying around?
Some thoughts on this question...

Does ISRO have more tests to do with PS4?  Performance, longevity, etc.?  Tests that would require more delta-v than inserting the primary and secondary payloads into their proper orbits?  (This assumes there will be no de-orbit burn at the end of the launch campaign to dispose the PS4 upon controlled re-entry.)

Is this PS4 carrying more than the satellite payloads?  Are there any experiments or demonstration equipment aboard that will not be separated?  That would add to the mass orbited, but not be included in the sum of the satellite payload masses.

It may fall to the international community of satellite watcher amateur astronomers, observing the PS4 after the launch campaign is over, to glean the observations for analysis.
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Offline Steven Pietrobon

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Here is the only picture, a low resolution line drawing of RISAT 2BR1, in the press kit. Doesn't look like it has the deployable antenna of RISAT 2B.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline K210

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PSLV C48 Launch Campaign


Offline K210

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Vehicle on launch pad
« Last Edit: 12/09/2019 11:44 am by K210 »

Offline starbase

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Official webcast:
« Last Edit: 12/09/2019 04:14 pm by starbase »
bit.ly/SpaceLaunchCalendar ☆ bit.ly/SpaceEventCalendar

Offline Ken the Bin

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https://twitter.com/isro/status/1204367072915939328

Quote from: ISRO
The countdown for the launch of #PSLVC48/#RISAT2BR1 mission commenced today at 1640 Hrs (IST) from Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota.
#ISRO

Offline Ken the Bin

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https://twitter.com/isro/status/1204434108283154432

Quote from: ISRO
#ISRO #RISAT2BR1
Filling of fuel for the fourth stage(PS4) of #PSLVC48 completed

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https://twitter.com/isro/status/1204451273249968128

Quote from: ISRO
#ISRO #RISAT2BR1
Filling of Oxidiser for the fourth stage(PS4) of #PSLVC48 completed

Offline zubenelgenubi

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We now have two orbital launches separated by 1 hour, 1 minute:
The Soyuz launch from Plesetsk at 08:54 UTC, then this launch.
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Offline Ken the Bin

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https://twitter.com/isro/status/1204533508976173058

Quote from: ISRO
#ISRO #RISAT2BR1
Filling of fuel for the second stage(PS2) of #PSLVC48 commenced

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https://twitter.com/isro/status/1204602435584397312

Quote from: ISRO
#ISRO #RISAT2BR1
Filling of propellant for the second stage(PS2) of #PSLVC48 completed

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Official DD livestream


Offline K210

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Total payload weight should be around ~800 kg (628 kg + 200 kg co-passenger payloads)

Offline Steven Pietrobon

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Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Control room.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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T-30 minutes.
« Last Edit: 12/11/2019 08:26 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Commentators are talking about what they are going to talk about!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Great shot of the vehicle on the pad.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-25 minutes. Official start of webcast.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Commentators welcoming viewers.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Incorrect aspect ratio as normal....

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Sun getting low.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-20 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-15 minutes. Integration video.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-12 minutes. Some of the launch customers.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-10 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-9 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-8 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-7 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-6 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-5 minutes. Talking about wind biasing during launch.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-4 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-3 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-2 minutes. This is the lady making the time calls.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-1 minute.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Liftoff!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Chris Bergin

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T+1 minute.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Booster separation.

First stage separation. T+2 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Fairing separation. T+3 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+4 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Second stage separation. T+5 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+6 minutes.

Third stage burnout.
« Last Edit: 12/11/2019 09:02 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Where is Sri Lanka? :o

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T+7 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+8 minutes. Mission customer payloads.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+9 minutes. Still coasting.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+10 minutes. Third stage separation.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+11 minutes. Fourth stage ignition.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+12 minutes. PS4 performance normal.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+13 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+14 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+15 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Cutoff.

T+16 minutes
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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RISAT 2BR1 separation.

T+17 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Next two sats are away.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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First curbsat is away.

T+19 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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First Lemur is away.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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All sats are away!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Confirmation of mission success!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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ISRO Chairman declaring that all satellites deployed precisely into their orbits.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Chairman receiving new book on all the PSLV missions.

VSSC Director.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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URSC Director. Solar panels of RISAT 2BR1 have been deployed. Cartosat 3 is working well. Saying "third satellite in series in two months". Not sure if he means RISAT 2BR2.
« Last Edit: 12/11/2019 09:30 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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SDSC SHAR Director.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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URSC Director. Solar panels of RISAT 2BR1 have been deployed. Cartosat 3 is working well. Saying "third satellite in series in two months". Not sure if he means RISAT 2BR2.

Other possibility would be RISAT-1A as that too is due for launch soon

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SAC Director. 108 systems are all made in India.
« Last Edit: 12/11/2019 09:34 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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LPSC Director.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Mission Director. Says vehicle took off from a virtually new launch pad.
« Last Edit: 12/11/2019 09:36 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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IPRC Director.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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IISU Director. Precise orbit has been achieved.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Spacecraft Director.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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ISRO Director talking about using PSLV to send a mission to the Sun. This is the last mission for ISRO this year.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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End of webcast.

Congratulations to ISRO and all the customer payloads for the successful launch!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Going back and listening to the URSC Director, I'm pretty sure he means that RISAT 2BR2 is launching in two months, as he previously mentioned that RISAT 2BR1 is the second satellite in the series.
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 Nice launch and mission!  Why the huge discrepancy between the original schedule for RISAT-2BRR2 and the new reputed date of February? Maybe the preparation for SSLV-1?

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Full set of separation times for the record:
-----------------------------

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Nice launch and mission!  Why the huge discrepancy between the original schedule for RISAT-2BRR2 and the new reputed date of February? Maybe the preparation for SSLV-1?

Because it will be another 2 months before RISAT-2BR2 is ready for launch

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Confirmed that Tyvak-0129 is the NASA-ARC/Busek PDT-1 pathfinder demo test

https://twitter.com/planet4589/status/1204860228543680512

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Liftoff Shots

Online Galactic Penguin SST

Hmm...I thought the main satellite is supposed to be a secret....

https://twitter.com/isro/status/1205102264580329478
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Hmm...I thought the main satellite is supposed to be a secret....

They showed the satellite during the webcast, so I guess ISRO decided that showing what it looked like with the antenna deployed wasn't a big deal.
« Last Edit: 12/13/2019 04:49 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Nice video of the launch,  as viewed from Chennai
astronaut on space ship earth

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Nice video of the launch,  as viewed from Chennai

Man, the separation events looks awesome! Thank god, it wasn't gloomy on the day of launch here in Chennai.

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Nice video of the launch,  as viewed from Chennai

These amutear videographers are doing a better job than DD. DD camera person cut off right at the moment of stage seperation in the livestream.

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Hmm...I thought the main satellite is supposed to be a secret....

https://twitter.com/isro/status/1205102264580329478

It's application is indeed a "secret". On the other hand ISRO historically has not been shy about posting images of military satellites (GSAT-7,GSAT-7A,Hysis and EMISAT are some examples) so i dont find this all too surprising. What i do find odd though it why this is not on their official website but is on some random twitter post.

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Watch the successful deployment of Radial Rib Antenna of #RISAT2BR1 in orbit as observed by onboard camera.

https://twitter.com/isro/status/1206457891516846081

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Has anyone answered, or found the answer to, why a PSLV-QL was used on this launch, as opposed to Core Alone (or DL for that matter)?
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Has anyone answered, or found the answer to, why a PSLV-QL was used on this launch, as opposed to Core Alone (or DL for that matter)?

I donít know the answer, and I was asking the same question.

My logic is that the lighter the payload, the less capable variant of a rocket family you use to launch it.
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Offline russianhalo117

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Has anyone answered, or found the answer to, why a PSLV-QL was used on this launch, as opposed to Core Alone (or DL for that matter)?

I donít know the answer, and I was asking the same question.

My logic is that the lighter the payload, the less capable variant of a rocket family you use to launch it.
Qualification campaign to satisfy a future payload??

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Circling back to this 2019 mission:
There was discussion that the rocket had larger capacity than was used.
This image looks to me like a dual launch adapter rather than the usual payload adapter for single-main-payload missions. There is a cataloged debris object 2019-089G which SpaceTrack tags with radar cross section = LARGE.
It has been pointed out to me that the inclination versus time of object G shows a change in May 2020 suggesting maybe that something finished outgassing?
Maybe there was a dummy second payload that replaced a planned second primary payload?
Interested in other interpretations.
-----------------------------

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Circling back to this 2019 mission:
There was discussion that the rocket had larger capacity than was used.
This image looks to me like a dual launch adapter rather than the usual payload adapter for single-main-payload missions. There is a cataloged debris object 2019-089G which SpaceTrack tags with radar cross section = LARGE.
It has been pointed out to me that the inclination versus time of object G shows a change in May 2020 suggesting maybe that something finished outgassing?
Maybe there was a dummy second payload that replaced a planned second primary payload?
Interested in other interpretations.

The Japanese QPS-SAR 1 (Izanagi) was carried inside the DLA (and IIRC also 1HOPSat-TD, too).

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