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LIVE: PSLV-CA C29, TeLEOS-1, December 16, 2015 12:30 UTC
by
input~2
on 18 Apr, 2015 15:01
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#1
by
input~2
on 23 Aug, 2015 20:28
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Now planned in December 2015 ( 6 satellites onboard)
(
source)
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#2
by
isro-watch
on 25 Aug, 2015 03:45
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Also mentioned in the
article is PSLV C29 launch with 6 singapore satellites by the end of year
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#3
by
Steven Pietrobon
on 25 Aug, 2015 05:03
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Also mentioned in the article is PSLV C29 launch with 6 singapore satellites by the end of year
I believe that is TeLEOS 1, VELOX C1, Kent Ridge 1 , Galassia and two other satellites.
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#4
by
Skyrocket
on 27 Aug, 2015 11:59
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Also mentioned in the article is PSLV C29 launch with 6 singapore satellites by the end of year
I believe that is TeLEOS 1, VELOX C1, Kent Ridge 1 , Galassia and two other satellites.
Correct.
Does anyone have info on the other two satellites?
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#5
by
Steven Pietrobon
on 28 Sep, 2015 09:31
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The Max Valier page is showing a countdown to 5 December 0130 UTC. My records indicated that Max Valier was going to fly on a PSLV-CA, so it might be possible this payload is going to be on this flight.
http://www.satmaxvalier.it/indexThe other payload might possibly be SkySat 3.
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#6
by
Skyrocket
on 28 Sep, 2015 09:58
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The Max Valier page is showing a countdown to 5 December 0130 UTC. My records indicated that Max Valier was going to fly on a PSLV-CA, so it might be possible this payload is going to be on this flight.
http://www.satmaxvalier.it/index
The other payload might possibly be SkySat 3.
I am not sure, as this mission goes to a low inclination orbit of 15°, which would not allow direct contact of the satellite with ground stations in northern Italy.
SkysSat 3 would likely also prefer a high inclination orbit for more coverage.
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#7
by
Steven Pietrobon
on 29 Sep, 2015 05:37
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Thanks Gunter. I had thought this launch was going into a polar orbit.
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#8
by
input~2
on 18 Oct, 2015 20:30
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#9
by
input~2
on 22 Oct, 2015 07:14
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#10
by
input~2
on 22 Oct, 2015 08:53
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Launch masses for 5 passengers on this launch :
TeLEOS-1: 400 kg
Velox C1: 135 kg
Kent Ridge 1: 80 kg
Velox II: 12 kg
Galassia: 2 kg
Total: 629 kg
(sources: NTU, NUS)
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#11
by
input~2
on 10 Nov, 2015 17:01
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#12
by
input~2
on 15 Nov, 2015 14:40
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#13
by
input~2
on 28 Nov, 2015 13:49
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#14
by
zubenelgenubi
on 03 Dec, 2015 22:37
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#15
by
m.prasad
on 04 Dec, 2015 13:51
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As per my observation, this is the 50th rocket launch from Sriharikota (considering all SLVs - SLV, ASLV, PSLV, GSLV & LVM3). Can some one validate this point?
Here are some important milestones:
01. SLV3-E1 10-Aug-1979
05. ASLV3-D1 13-Jul-1987
10. PSLV-D2 15-Oct-1994
15. PSLV-C3 22-Oct-2001
20. PSLV-C6 05-May-2005
25. PSLV-C10 21-Jan-2008
30. GSLV-D3(M2) 15-Apr-2010
35. PSLV-C18 12-Oct-2011
40. PSLV-C25 05-Nov-2013
45. GSLV-X1(M3) 18-Dec-2014
It took around ~35 years for ISRO to achieve this feat. One can observe a faster pace of launches in last few years (2nd 25 in last 7/8 years time period). Hope to see the century soon...
. I believe, ISRO will reach it within next 5-7 years time frame.
Thx
~Prasad
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#16
by
Ohsin
on 04 Dec, 2015 16:24
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04 SLV
04 ASLV
31 PSLV
09 GSLV
01 LVM3X
That is 49 flights
BUT we also had a contraption SO-300-200 that flew from Sriharikota
In the case of ASLV, Rohini rockets were used to test strap-ons. It may be recalled that ASLV was ISRO’s first launch vehicle to use strap-ons. To get some hand-on experience, ISRO rigged a Rohini strap-on rocket. The core was the RH-300 while the two strap-ons were the RH-200 rockets (only the boosters, of course). The contraption, designated as SO-300-200 was successfully flown on 16 October 1985 from Sriharikota.
Above excerpt taken from recently released book "From Fishing Hamlet to Red Planet". LVM3X and SO-300-200 both were suborbital experiments.
I think this footage(@4m30s mark) in this video is of SO-300-200.
Can't wait for Vol.2 it would have neat photographs
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#17
by
Galactic Penguin SST
on 04 Dec, 2015 17:19
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#18
by
input~2
on 04 Dec, 2015 17:26
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Back to TeLEOS-1 et al. launch:
A2333/15 - PSLV-C29 ROCKET LAUNCH FROM SHAR RANGE,SRIHARIKOTA WILL TAKEPLACE 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 THROUGH A SEPARATE NOTAM. LAUNCH PAD COORD: 1343.9N 08014.2E NO FLT IS PERMITTED OVER THE DNG ZONE. A.DNG ZONE 1 A CIRCLE OF 10NM AROUND THE LAUNCHER B.DNG ZONE 2 A RECTANGULAR AREA BOUNDED BY: 1300N 08205E 1335N 08210E 1325N 08250E 1250N 08245E C.DNG ZONE 3 A RECTANGULAR AREA BOUNDED BY: 1220N 08445E 1255N 08455E 1240N 08550E 1205N 08540E D.DNG ZONE 4 A RECTANGULAR AREA BOUNDED BY: 0930N 09450E 1025N 09500E 1010N 09555E 0915N 09545E E.DNG ZONE 5 A RECTANGULAR AREA BOUNDED BY: 2100S 13400W 1900S 13400W 0800S 09400W 1000S 09400W ROUTES AFFECTED IN CHENNAI FIR ARE: N571 P761 W20 A465 P628 Q10 Q11 V003 V004 V009 AND V011 CLOSURE/ALTERNATE ROUTINGS: END PART 1 OF 2. BTN 1200-1600, 16 DEC 12:00 2015 UNTIL 15 JAN 16:00 2016. CREATED: 04 DEC 17:01 2015
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#19
by
input~2
on 04 Dec, 2015 17:38
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#20
by
input~2
on 05 Dec, 2015 09:45
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NOTAMed areas for respectively:
- 1st stage debris
- Fairing debris
- 2nd stage debris
- 3rd stage debris
This is the flight profile for PSLV-CA not PSLV-XL
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#21
by
zubenelgenubi
on 05 Dec, 2015 14:24
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#22
by
input~2
on 10 Dec, 2015 07:38
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#23
by
K210
on 10 Dec, 2015 10:14
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Looks like the launch date is holding after all. Any idea which pad this will be launched from?
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#24
by
Skyrocket
on 10 Dec, 2015 16:46
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#25
by
sportyfailure
on 10 Dec, 2015 16:50
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Six Satellites . I even found their Monetary value in export import database zauba.com
The satellite that wasn't known earlier is Athenoxat-1 owned by National University of Singapore
Date HS Code Description Origin Country Port of Discharge Unit Quantity Value (INR) Per Unit (INR)
30-Nov-2015 88026000 NUSKR1 SATELLITE ,PART NO:BST-NUS-KR1-001,(LAUNCH OF NUS-KENTRIDGE-1 ON INDIAN (PSLV) Germany Chennai Air Cargo NOS 1 138,678,320 138,678,320
30-Nov-2015 88026000 ATHENOXAT-1 FLIGHT MODEL (FM) AND THE ATTACHED SOLAR PANELS,PART NO: ATHENOX,(LAUNCH OF ATHENOXAT-1 ON INDIAN (PSLV)) Singapore Chennai Air Cargo NOS 1 7,627,520 7,627,520
20-Nov-2015 88026000 MICRO SATELLITE,PART NO:VELOX-CI,(FOR LAUNCH OF VELOX-CI ON INDIAN (PSLV)) South Korea Chennai Air Cargo NOS 1 542,127,620 542,127,620
14-Nov-2015 88026000 NANO-SATELLITE GALASSIA IN 2U NANO-SATELLITE DEPLOYER IN PELICASE,(PELICASE RETURNABLE),PART NO:GALASSIA,(FOR LAUNCH OF Singapore Chennai Air Cargo NOS 1 5,965,313 5,965,313
14-Nov-2015 88026000 SATELLITE * HOUSE 2 X 8S5P VES16 LITHIUM BATTERY,PART NO:TELEOS-1(FOR LAUNCH OF TELEOS-1 ON INDIAN PSLV) Singapore Chennai Air Cargo NOS 1 3,054,240,000 3,054,240,000
14-Nov-2015 88026000 VELOX-II SATELLITE 6U NANO - SATELLITE DEPLOYER ,PART NO:VELOX-II,(FOR LAUNCH OF VELOX-II ON INDIAN PSLV) Singapore Chennai Air Cargo NOS 1 17,895,938
Monetary Value of Satellites
Teleos-1 - 3,054,240,000 INR
KentRidge - 138,678,320 INR
VELOX-CI - 542,127,620 INR
ATHENOXAT-1 - 7,627,520 INR
GALASSIA - 5,965,313 INR
VELOX-II - 17,895,938 INR
More details go to zauba.com and search with satellite name. Cost of older satellites is also available
DeOrbitSail - 22,254,618 INR
CBNT-1 - 60,297,000 INR
DMC3 - 1,606,412,540 INR each for the three total 3x 1,606,412,540 INR
LAPAN-A2 - 168,796,256 INR
INR stands for Indian rupee
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#26
by
input~2
on 10 Dec, 2015 19:07
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Six Satellites . I even found their Monetary value in export import database zauba.com
The satellite that wasn't known earlier is Athenoxat-1 owned by National University of Singapore
Welcome to the forum, sporty and thanks for the valuable information!
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#27
by
Ohsin
on 11 Dec, 2015 08:07
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As per my observation, this is the 50th rocket launch from Sriharikota (considering all SLVs - SLV, ASLV, PSLV, GSLV & LVM3). Can some one validate this point?
Here are some important milestones:
01. SLV3-E1 10-Aug-1979
05. ASLV3-D1 13-Jul-1987
10. PSLV-D2 15-Oct-1994
15. PSLV-C3 22-Oct-2001
20. PSLV-C6 05-May-2005
25. PSLV-C10 21-Jan-2008
30. GSLV-D3(M2) 15-Apr-2010
35. PSLV-C18 12-Oct-2011
40. PSLV-C25 05-Nov-2013
45. GSLV-X1(M3) 18-Dec-2014
It took around ~35 years for ISRO to achieve this feat. One can observe a faster pace of launches in last few years (2nd 25 in last 7/8 years time period). Hope to see the century soon.... I believe, ISRO will reach it within next 5-7 years time frame.
Thx
~Prasad
ISRO is counting '49 Launch Vehicle Missions' so far
So yeah this will be 50th.
Source :
https://twitter.com/pradeepbv/status/675188516511490049
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#28
by
vyoma
on 11 Dec, 2015 08:53
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In flight profile, they've mentioned fourth stage restart as well.
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#29
by
Ohsin
on 11 Dec, 2015 11:43
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In flight profile, they've mentioned fourth stage restart as well.
To get rid of it I suppose?
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#30
by
sportyfailure
on 11 Dec, 2015 12:33
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I think they want to validate in-orbit restart of the modified engine which will be used both in PAM-G and Orbital Vehicle.
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#31
by
vyoma
on 12 Dec, 2015 07:12
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Interesting. This is the first time I am seeing fourth stage restart being mentioned in flight profile (but not sure if they were doing it earlier as well and just didn't put it in brochure). If it's not done before, and if it's to validate PAM-G, then it would be cool
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#32
by
Ohsin
on 13 Dec, 2015 15:12
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#33
by
Ohsin
on 14 Dec, 2015 05:24
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#34
by
mangiumicro
on 14 Dec, 2015 13:09
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hi Guys,
sorry to correct you... Athenoxat-1 has nothing to do with National University of Singapore.
It is developed and build by Microspace Rapid Pte Ltd, a private company in Singapore.
Cheers.
G.
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#35
by
isro-watch
on 15 Dec, 2015 03:23
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#36
by
Ohsin
on 15 Dec, 2015 04:10
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#37
by
worldtimedate
on 15 Dec, 2015 07:24
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Interesting. This is the first time I am seeing fourth stage restart being mentioned in flight profile (but not sure if they were doing it earlier as well and just didn't put it in brochure). If it's not done before, and if it's to validate PAM-G, then it would be cool
If the last stage ( 4th stage for PSLV ) gets restarted in this mission, then this will be the first time that any ISRO launch vehicle is doing this feature. It will be an achievement, but disappointingly ISRO is late to accomplish such feature. Chinese Long March 3A had accomplished this feat in the late 80s. All the Long March 3 series of Launchers and Ariane 5 ES have restart capability for the last stage. Japanese H-IIA and H-IIB Launchers have 16 restarts capability for the last stage. Not to speak of US and Russian Launchers.
--- [ --- ]
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#38
by
vineethgk
on 15 Dec, 2015 12:28
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What is the main challenge in the restart of a hypergolic upper stage, given that it does not require an igniter? Is it the difficulty in pushing propellent from tanks to the engine when the stage is experiencing zero acceleration? Or is it something else?
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#39
by
Ohsin
on 15 Dec, 2015 16:41
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ISRO to test multiple burn fuel stage/engine on December 16
The Indian space agency on Wednesday will be testing its ability to restart the fourth-stage engine of its rocket Polar Satellite Launch Vehicle (PSLV) on shutting it down after putting into orbit six Singaporean satellites.
Technically speaking, India will be testing its multiple burn fuel stage/rocket engine for the first time.
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"The restart and shut off of the fourth stage engine is done as a first step towards launching multiple satellites but in different orbits,"
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"Restarting a rocket engine soon after it is shut off is a critical technology that has to be mastered. Once a rocket engine is activated, then the heat generated is very high. The trick is to cool it down in the space and to restart it at a short gap,"
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"This is entirely different from switching on and off the communication satellite's engines in the space. The interval between two restarts of a communication satellite engine will be in days. But in the case of restarting a rocket engine, the time gap will be in hours,""By that time the rocket's engine has to be cooled down. This part of the experiment is very critical,"
http://zeenews.india.com/news/space/isro-to-test-multiple-burn-fuel-stage/engine-on-december-16_1834926.html
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#40
by
AJA
on 15 Dec, 2015 18:07
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What is the main challenge in the restart of a hypergolic upper stage, given that it does not require an igniter? Is it the difficulty in pushing propellent from tanks to the engine when the stage is experiencing zero acceleration? Or is it something else?
(Caveat: IANAE, but ...)
Ensuring that the engine doesn't have gas bubbles in the fuel/ox feed lines, and doesn't experience thrust transients; which might rip it apart; is a non-trivial problem. The LAM that they use for satellites operates with MMH and Nitrogen Tetroxide, IIRC, AND operates in a blow-down propulsion mode with Helium bottles providing the pressure. The (burpy) start provided by such a system might be OK at the lower thrust levels, and the smoother ramp up of an apogee motor for a satellite, but at the levels of thrust developed by a stage... you'd have to be concerned about RUD. So ISRO may've augmented the stage with (solid, monoprop, or even small bi-prop...although that seems unnecessarily complex) ullage motors, or modified the tankage to have those meshes and wicks that use capillary action and other surface tension effects (which strive to maintain a free surface), to ensure that the feed to the engines is smooth.
Furthermore, you'd have to maintain power to the final stage's flight computers (and the sensors) for ATLEAST the period of time between MECO and the second ignition. Satellites are power positive in that they GENERATE power. Not so for a rocket stage... so you'll have to add battery capacity. That means (non-payload) mass. You'd also probably want to maintain telemetry UPlink, in case you want to retain the option to command the stage remotely (for, what will be a very short lifetime - dictated by a mix of battery life time -- itself a function of thermal loads as you go in and out of orbital sunlight; and communication stations with the appropriate coverage).
Uplink (and downlink) AND power
could potentially be established by using the satellite's communication systems itself (i.e. without requiring additional batteries or telemetry antennae on the stage)... provided that there was an umbilical between the payload and the stage to allow a reverse transfer of power, and data. Given that the payload fairing would've already been jettisoned, the payload's antenna will likely be unshielded (unless it's mounted with its axis pointing INTO the stage); and the solar panels of the satellite could be deployed. HOWEVER, performing STAGE thrust manoeuvres with the solar arrays deployed would put those fragile structures under stresses that they're likely not designed to handle (and likely WON'T be designed to handle... because of the mass cost for a one-off use). So yeah, power and data communications capability of the stage would have to be upgraded; in addition to the propulsion tankage/ullage mechanisms.
EDIT: I did read the Zee News bit that Ohsin linked to in the previous post, but I'm a little unsure as to why it has to be cooled down. Sure, transient thrust spikes and concomitant mechanical and thermal stresses are all sorts of complex, and I can imagine that there's a very strict set of initial conditions required during the startup of the engine... and yes, thermal expansion and the geometry changes of the combustion chamber and the nozzle, as well as heat dissipation (when starting cold, as opposed to starting hot) during the startup will all be different... but my gut feeling is still scoffing at how an engine that can operate for 100s (say) and sustain the thermal loads for that long, will have a problem if it operates for 40s, takes a break, and comes back.
Anyway, I wonder if there's any kind of regenerative cooling that they're using this time round? Pumping the fuel through the nozzle, and mixing it with rest of the fuel - to aid this (and general) cooling down?
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#41
by
Chris Bergin
on 16 Dec, 2015 00:16
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Moved for live coverage!
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#42
by
William Graham
on 16 Dec, 2015 01:41
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As per my observation, this is the 50th rocket launch from Sriharikota (considering all SLVs - SLV, ASLV, PSLV, GSLV & LVM3). Can some one validate this point?
Here are some important milestones:
01. SLV3-E1 10-Aug-1979
05. ASLV3-D1 13-Jul-1987
10. PSLV-D2 15-Oct-1994
15. PSLV-C3 22-Oct-2001
20. PSLV-C6 05-May-2005
25. PSLV-C10 21-Jan-2008
30. GSLV-D3(M2) 15-Apr-2010
35. PSLV-C18 12-Oct-2011
40. PSLV-C25 05-Nov-2013
45. GSLV-X1(M3) 18-Dec-2014
It took around ~35 years for ISRO to achieve this feat. One can observe a faster pace of launches in last few years (2nd 25 in last 7/8 years time period). Hope to see the century soon.... I believe, ISRO will reach it within next 5-7 years time frame.
Thx
~Prasad
There have been sounding rocket launches from SHAR as well, so it's hard to justify counting the suborbital GSLV Mk.III and not those. The next launch after TeLEOS should be the 50th orbital attempt from the site though.
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#43
by
Chris Bergin
on 16 Dec, 2015 01:48
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#44
by
jcm
on 16 Dec, 2015 04:23
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#45
by
Ohsin
on 16 Dec, 2015 04:50
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#46
by
gwiz
on 16 Dec, 2015 09:52
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#47
by
seshagirib
on 16 Dec, 2015 10:13
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The web cast links in the ISRO web site do not work for me. (firefox - plug in required ) any alternatives ?
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#48
by
mtakala24
on 16 Dec, 2015 10:17
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#49
by
Ohsin
on 16 Dec, 2015 10:18
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#50
by
mtakala24
on 16 Dec, 2015 10:46
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It could be this livestream on their youtube channel:
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#51
by
Kryten
on 16 Dec, 2015 11:05
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Streams are live.
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#52
by
K210
on 16 Dec, 2015 11:08
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T-22 mins
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#53
by
K210
on 16 Dec, 2015 11:10
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The stream quality is a lot better than last time
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#54
by
ss1_3
on 16 Dec, 2015 11:11
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PS4 to be re ignited post s/c separation, after around 50 mins. This operation would be monitored through Alcantara, Brazil station.
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#55
by
eeergo
on 16 Dec, 2015 11:16
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Launch authorization key switched to ON by mission director.
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#56
by
eeergo
on 16 Dec, 2015 11:17
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Autosequence initiated.
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#57
by
Chris Bergin
on 16 Dec, 2015 11:18
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#58
by
Chris Bergin
on 16 Dec, 2015 11:19
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#59
by
Chris Bergin
on 16 Dec, 2015 11:20
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They might want to cut the trees...
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#60
by
Chris Bergin
on 16 Dec, 2015 11:20
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#61
by
Chris Bergin
on 16 Dec, 2015 11:20
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T-10 mins.
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#62
by
Chris Bergin
on 16 Dec, 2015 11:21
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#63
by
eeergo
on 16 Dec, 2015 11:27
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Flight mode on.
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#64
by
Chris Bergin
on 16 Dec, 2015 11:27
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#65
by
Chris Bergin
on 16 Dec, 2015 11:28
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#66
by
Chris Bergin
on 16 Dec, 2015 11:29
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T-60 seconds.
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#67
by
Chris Bergin
on 16 Dec, 2015 11:31
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#68
by
Chris Bergin
on 16 Dec, 2015 11:31
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#69
by
Chris Bergin
on 16 Dec, 2015 11:32
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#70
by
Chris Bergin
on 16 Dec, 2015 11:32
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Staging 1-2.
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#71
by
Chris Bergin
on 16 Dec, 2015 11:33
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#72
by
Chris Bergin
on 16 Dec, 2015 11:34
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Round of applause for fairing sep, which is interesting.
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#73
by
Chris Bergin
on 16 Dec, 2015 11:35
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#74
by
Chris Bergin
on 16 Dec, 2015 11:35
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#75
by
Chris Bergin
on 16 Dec, 2015 11:37
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End of third stage flight.
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#76
by
Chris Bergin
on 16 Dec, 2015 11:37
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#77
by
Chris Bergin
on 16 Dec, 2015 11:40
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Staging. Third stage sep.
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#78
by
Chris Bergin
on 16 Dec, 2015 11:44
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#79
by
Chris Bergin
on 16 Dec, 2015 11:47
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#80
by
Chris Bergin
on 16 Dec, 2015 11:48
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End of powered flight.
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#81
by
Chris Bergin
on 16 Dec, 2015 11:50
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#82
by
Chris Bergin
on 16 Dec, 2015 11:50
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#83
by
Chris Bergin
on 16 Dec, 2015 11:52
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Another successful mission!
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#84
by
Chris Bergin
on 16 Dec, 2015 11:53
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#85
by
Mapperuo
on 16 Dec, 2015 11:54
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#86
by
Chris Bergin
on 16 Dec, 2015 12:39
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#87
by
Ohsin
on 16 Dec, 2015 13:54
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<snip>
Monetary Value of Satellites
Teleos-1 - 3,054,240,000 INR
KentRidge - 138,678,320 INR
VELOX-CI - 542,127,620 INR
ATHENOXAT-1 - 7,627,520 INR
GALASSIA - 5,965,313 INR
VELOX-II - 17,895,938 INR
<snip>
INR stands for Indian rupee
And as per this DoS release
http://pib.nic.in/newsite/PrintRelease.aspx?relid=133386Dr Jitendra Singh informed about the successful launch of six Singapore satellites from Sriharikota to mark the Golden Jubilee of the independence of the Republic of Singapore. He further informed that this launch was agreed upon on commercial basis and the government of Singapore has paid 26 million euros for it.
That is 1,893,574,845 INR
...
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#88
by
antriksh
on 16 Dec, 2015 14:18
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Single launch multi-orbit missions, refreshing
. They must have got mission inquiries from customers involving multi-orbit capabilities.
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#89
by
vineethgk
on 16 Dec, 2015 14:35
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Would PAM-G require multiple restarts to deliver a satellite like GISAT to GEO? Maybe they have plans to test multiple restarts in the next few PSLV flights?
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#90
by
baldusi
on 16 Dec, 2015 15:47
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Congratulations to ISRO and Singapore!
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#91
by
sportyfailure
on 16 Dec, 2015 16:25
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And as per this DoS release
http://pib.nic.in/newsite/PrintRelease.aspx?relid=133386
Dr Jitendra Singh informed about the successful launch of six Singapore satellites from Sriharikota to mark the Golden Jubilee of the independence of the Republic of Singapore. He further informed that this launch was agreed upon on commercial basis and the government of Singapore has paid 26 million euros for it.
That is 1,893,574,845 INR
...
The import database only lists monetary value of satellites(like the amount insured for each paayliad and not launch insurance) and not launch costs
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#92
by
Ohsin
on 16 Dec, 2015 17:18
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That is clear but look at the comparison!
Secondary objective successful
Indian space agency ISRO on Wednesday successfully tested restarting of its Polar Satellite Launch Vehicle (PSLV) rocket after its engine was cut off during the mission to launch six Singaporean satellites, a top official said.
"The restart test was successful. The engine was fired for nearly five seconds. We will be using this technology sometime next year," Indian Space Research Organisation (ISRO) chairman A.S. Kiran Kumar told IANS.
According to him, the next three satellite launches using PSLV rocket will be navigation satellites.
After that, there will be some multiple satellite launches and this technology will be used, he added.
"The restart of the engine happened beautifully. The test was a success," S. Somnath, director of the Liquid Propulsions Systems Centre, told IANS.
According to him, the multiple burn fuel stage/engine will be used in PSLV-C35 rocket which will carry two satellites.
One satellite will be launched at an higher orbit and the other one will be at a slightly lower orbit, he said.
http://www.newindianexpress.com/states/andhra_pradesh/ISRO-Successfully-Tests-Multiple-Burn-Fuel-Engine-During-Launch-of-Six-Singaporean-Satellites/2015/12/16/article3180961.ece
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#93
by
beidou
on 16 Dec, 2015 18:22
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Was there any mention of the launch schedule for 2016 in the Chairman's speech?
Thanks.
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#94
by
input~2
on 16 Dec, 2015 19:43
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A first object has been cataloged by USSTRATCOM as Object A and also as Object G:
2015-077A or G/41172 in 400 x 573 km x 14.69°
Could be PSLV 4th stage.
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#95
by
vyoma
on 17 Dec, 2015 02:10
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http://www.isro.gov.in/update/16-dec-2015/pslv-successfully-launches-six-satellites-singaporeDec 16, 2015
PSLV Successfully Launches Six Satellites from SingaporeIn its thirty second flight conducted from Satish Dhawan Space Centre (SDSC), SHAR, Sriharikota today evening (December 16, 2015), ISRO's Polar Satellite Launch Vehicle PSLV-C29 successfully launched six satellites from Singapore, including the 400 kg TeLEOS-1, the primary satellite. The other five satellites were co. passenger payloads. PSLV-C29 launched all the six payloads into an orbit of 549 km height inclined at an angle of 15 deg to the equator. The six satellites carried by PSLV-C29 today together weighed about 624 kg at lift-off. These six satellites were launched as part of the agreement entered into between ST Electronics (Satcom & Sensor Systems), Singapore and Antrix Corporation Limited, the commercial arm of the Indian Space Research Organisation (ISRO), a government of India Company under the Department of Space (DOS). This is the eleventh flight of PSLV in ‘core-alone’ configuration (without the use of solid strap-on motors). PSLV has successfully launched 57 satellites for customers from abroad including the six Singapore satellites launched today. After a 59 hour smooth count down, the 227.6 ton PSLV-C29 lifted off from the First Launch Pad (FLP) at SDSC SHAR at 1800 hrs (6:00 pm) IST with the ignition of its first stage. The important flight events included the separation of the first stage, ignition of the second stage, separation of the payload fairing at about 117 km altitude, second stage separation, third stage ignition and separation, fourth stage ignition and cut-off. Once the intended orbit was achieved, TeLEOS-1 was deployed at about 18 min 12 seconds after lift-off. This was followed by the deployment of other five satellites, viz., Kent Ridge-1, VELOX-C1, VELOX-II, Galassia and Athenoxat-1 in quick succession in the subsequent three minutes.
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#96
by
vyoma
on 17 Dec, 2015 02:15
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Would PAM-G require multiple restarts to deliver a satellite like GISAT to GEO? Maybe they have plans to test multiple restarts in the next few PSLV flights?
I think so. Once PAM-G+spacecraft is inserted into LEO/GTO, PAM-G would need to do burns at perigee to raise orbit, and then burns at apogee to make orbit circular. Once intended orbit is reached, PAM-G would detach itself from spacecraft and then probably perform another burn to raise itself into graveyard orbit.
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#97
by
antriksh
on 17 Dec, 2015 04:23
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Would PAM-G require multiple restarts to deliver a satellite like GISAT to GEO? Maybe they have plans to test multiple restarts in the next few PSLV flights?
I think so. Once PAM-G+spacecraft is inserted into LEO/GTO, PAM-G would need to do burns at perigee to raise orbit, and then burns at apogee to make orbit circular. Once intended orbit is reached, PAM-G would detach itself from spacecraft and then probably perform another burn to raise itself into graveyard orbit.
IMHO, this restart testing has nothing to do with PAM-G, but to establish single launch multi-orbit mission capability of PSLV. PAM-G was to be used for Glonass sats. I think the restart capability can be used for OV.
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#98
by
vyoma
on 17 Dec, 2015 05:53
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Would PAM-G require multiple restarts to deliver a satellite like GISAT to GEO? Maybe they have plans to test multiple restarts in the next few PSLV flights?
I think so. Once PAM-G+spacecraft is inserted into LEO/GTO, PAM-G would need to do burns at perigee to raise orbit, and then burns at apogee to make orbit circular. Once intended orbit is reached, PAM-G would detach itself from spacecraft and then probably perform another burn to raise itself into graveyard orbit.
IMHO, this restart testing has nothing to do with PAM-G, but to establish single launch multi-orbit mission capability of PSLV. PAM-G was to be used for Glonass sats. I think the restart capability can be used for OV.
You're right.
http://www.newindianexpress.com/states/andhra_pradesh/ISRO-Successfully-Tests-Multiple-Burn-Fuel-Engine-During-Launch-of-Six-Singaporean-Satellites/2015/12/16/article3180961.ece"The restart and shut off of the fourth stage engine is done as a first step towards launching multiple satellites but in different orbits," an ISRO official told IANS, declining to be named.
Launching of multiple satellites with a single rocket is nothing new for ISRO and it has been doing that for several years. The challenge, however, is to launch several satellites at different orbits with one rocket.
"Restarting a rocket engine soon after it is shut off is a critical technology that has to be mastered. Once a rocket engine is activated, then the heat generated is very high. The trick is to cool it down in the space and to restart it at a short gap," an industry expert told IANS.
"This is entirely different from switching on and off the communication satellite's engines in the space. The interval between two restarts of a communication satellite engine will be in days. But in the case of restarting a rocket engine, the time gap will be in hours," the expert added.
"By that time the rocket's engine has to be cooled down. This part of the experiment is very critical," he explained.
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#99
by
Steven Pietrobon
on 17 Dec, 2015 05:59
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Full replay.
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#100
by
Steven Pietrobon
on 17 Dec, 2015 06:25
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Was there any mention of the launch schedule for 2016 in the Chairman's speech?
I listened to all the speeches, but no specific information was given. Mention was given to the three IRNSS launchers at a monthly rate and that they are working on PSLV C31, C32, C33 and 34.
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#101
by
Ohsin
on 17 Dec, 2015 07:54
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And the goodies
Edit:
Great amateur footage.
Visibility was awesome and as far as Chennai it was startling people.
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#102
by
vineethgk
on 17 Dec, 2015 12:17
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Seen from Chennai !!
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#103
by
m.prasad
on 17 Dec, 2015 12:31
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The imparted velocity is 7.10 km/s. Was there any issue? Same was observed in C30/Astrosat launch as well. What would be the impact on the payload if less velocity is imparted to it? I mean does the satellite, post-injection, need extra-LAM burn to achieve the required velocity?
Thx
~Prasad
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#104
by
Galactic Penguin SST
on 17 Dec, 2015 14:20
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Clear views all the way to fairing separation:
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#105
by
aga
on 17 Dec, 2015 14:34
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What would be the impact on the payload if less velocity is imparted to it?
the periapsis/apoapsis would be lower (depending on where the burn occurred)
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#106
by
jcm
on 17 Dec, 2015 14:52
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The imparted velocity is 7.10 km/s. Was there any issue? Same was observed in C30/Astrosat launch as well. What would be the impact on the payload if less velocity is imparted to it? I mean does the satellite, post-injection, need extra-LAM burn to achieve the required velocity?
Thx
~Prasad
These sats don't have a LAM so they are stuck. Orbital data now in, looks fine: 530 x 550 km orbits
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#107
by
seshagirib
on 18 Dec, 2015 15:37
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Was there any mention of the launch schedule for 2016 in the Chairman's speech?
I listened to all the speeches, but no specific information was given. Mention was given to the three IRNSS launchers at a monthly rate and that they are working on PSLV C31, C32, C33 and 34.
No mention of the RLV-TD also........or did I miss it?
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#108
by
AJA
on 19 Dec, 2015 17:09
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#109
by
Ohsin
on 19 Dec, 2015 22:37
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http://www.newindianexpress.com/states/andhra_pradesh/ISRO-Successfully-Tests-Multiple-Burn-Fuel-Engine-During-Launch-of-Six-Singaporean-Satellites/2015/12/16/article3180961.ece
At the time of restart the fourth stage was in a lower altitude of 523.9 km while the satellites were ejected at 550 km altitude.
The engine operating for few seconds went up to an altitude of 524 km before the stage was cut off again.
(emphases mine)
They burned prograde? Huh? Why?
mmm I didn't pay attention to that but this Telugu source
http://www.andhrajyothy.com/Artical?SID=185600శ్రీహరికోట (సూళ్లూరుపేట), డిసెంబరు 17(ఆంధ్రజ్యోతి): అంతరిక్ష పరిశోధనలో అగ్రరాజ్యాలకు దీటుగా దూసుకుపోతున్న ఇస్రో... కక్ష్యలో వ్యర్థాలు లేకుండా ప్రయోగం చేపట్టడంలో తొలి ప్రయత్నంలోనే విజయం సాధిం చింది. నెల్లూరుజిల్లా షార్ నుంచి బుధవారం పీఎ్సఎల్వీ-సీ29 రాకెట్ను విజయవంతంగా ప్రయోగించింది. ఆరు సింగపూర్ ఉపగ్రహాలను నిర్దేశిత కక్ష్యలో పెట్టింది. ఇదే ప్రయోగంలో మరో అద్భుతాన్ని షార్ శాస్త్రవేత్తలు సాధించారు. ఉపగ్రహాలను కక్ష్యలో ప్రవేశపెట్టిన అనంతరం అక్కడి నుంచి రాకెట్ వ్యర్థ మోటార్లను వెనుకకు తీసుకువచ్చేందుకు చేసిన తొలి ప్రయత్నంలోనే విజయం సాధించారు. కక్ష్యలో వ్యర్థాలు ఉండకూడదన్న ఐరాస సూచనలను ఇస్రో ప్రతిష్ఠాత్మకంగా తీసుకుని అమలుకు ప్రయత్నించింది.
Google translated
Sriharikota (sullurupeta), December 17 (for life): Space Research Organisation agrarajyalaku the burgeoning labor ... without waste orbit, an experiment has had success in the first attempt. Nellurujilla Shore piesaelvi-C 29 rocket successfully launched Wednesday. Singapore has six satellites in orbit prescription. Another miracle in the experiment, the scientists were able to Shore. After the launch of the satellites in orbit debris from the rocket motors made the first attempt to bring back success. ISRO's ambitious attempts to implement the instructions of the United Nations to bring the waste undakudadanna orbit.
It appears it might've been retro to mitigate debris?
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#110
by
gwiz
on 20 Dec, 2015 10:39
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The payloads are in 530-550 km orbits, the stage is in a 400-570 km orbit, so the burn was mostly retro but not aligned exactly with the velocity vector.
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#111
by
Ohsin
on 01 Jan, 2016 05:09
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First stage separation was tad too smokey. You can see some pieces fly off before(@25s Shaped charge going off?) and after(@43s) the big puff @ 30 sec mark.
Edit: Stabilized the relevant portion
. I believe, ISRO will reach it within next 5-7 years time frame. 
So yeah this will be 50th.