Author Topic: FAILURE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)  (Read 89447 times)

Offline eeergo

The question is, will it attain a stable orbit? And even if it does, if the fairing doesn't separate, IRNSS-1H will go nowhere.
-DaviD-

Offline soltasto

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #81 on: 08/31/2017 01:43 pm »
It isn't no(r)minal for sure:


Offline Steven Pietrobon

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #82 on: 08/31/2017 01:44 pm »
T+13 minutes. Variation in performance.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline eeergo

Orbital velocity reached.

Weird high apogee, low perigee, but climbing.
-DaviD-

Offline soltasto

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #84 on: 08/31/2017 01:44 pm »
T+13 minutes. Variation in performance.

Looks like it's trying to compensate

Offline eeergo

Satellite still encapsulated.
-DaviD-

Offline Steven Pietrobon

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #86 on: 08/31/2017 01:45 pm »
T+14 minutes. Altitude looks pretty low.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline AJA

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #87 on: 08/31/2017 01:45 pm »
The question is, will it attain a stable orbit? And even if it does, if the fairing doesn't separate, IRNSS-1H will go nowhere.

They usually have good prop-margin. So orbit insertion isn't that much of an issue I guess. Plus, it's GTO... so the satellite's LAM will have to propel it to GSO. So that can compensate (tradeoff: satellite life). But if it's a fairing separation problem, then that is obviously an issue.

Spacecraft will have to go power positive pretty soon, I'd think. Otherwise the batteries might die.


And even before that, if the  satellite separates from the adapter... thinking there's no fairing...well. Goddamit. Sorry Chris, I know no speculation, but this is RARE. Especially for the PSLV.
« Last Edit: 08/31/2017 01:46 pm by AJA »

Offline eeergo

8 km/s, 9.7 km/s objective.

Inclination is within specs.
-DaviD-

Offline Steven Pietrobon

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #89 on: 08/31/2017 01:46 pm »
T+15 minutes.
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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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #90 on: 08/31/2017 01:47 pm »
T+16 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline eeergo

8.3 km/s.
-DaviD-

Offline AJA

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #92 on: 08/31/2017 01:48 pm »
Btw, partly #offtopic, but true test of political backing is what the PM will say now. He himself stated that during Mangalyaan's MOI, he'd come prepared to deliver a national address that was independent of the result of that burn.

Offline Steven Pietrobon

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #93 on: 08/31/2017 01:48 pm »
T+17 minutes. Perigee low, but should be OK.
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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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #94 on: 08/31/2017 01:49 pm »
PS4 cutoff!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline eeergo

Satellite moving inside fairing, separated.

Target: 284 by 20,650 Kilometers. You can see the difference with the attained in the screenshot (and around 1.3 km/s velocity difference)

Looks like a loss.
« Last Edit: 08/31/2017 01:51 pm by eeergo »
-DaviD-

Offline Steven Pietrobon

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #96 on: 08/31/2017 01:50 pm »
T+19 minutes. 167x6555 km orbit.
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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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #97 on: 08/31/2017 01:51 pm »
T+20 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline eeergo

Range Operations Director confirming heat-shield (PLF) didn't separate.
-DaviD-

Offline Steven Pietrobon

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Re: LIVE: IRNSS-1H, PSLV C39, SLP, August 31, 2017 (13:30 UTC)
« Reply #99 on: 08/31/2017 01:52 pm »
T+21 minutes. Heat shield failed to separate!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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