Author Topic: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012  (Read 41706 times)

Offline vineethgk

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Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #100 on: 02/01/2017 07:18 PM »
Bumping an old thread as I thought the update would best be posted here to give the context..

@Mods, please let me know if a separate thread needs to be created for this.

Indian RISAT-1 Spacecraft Fragments in
Late September


Quote
The Indian Radar Imaging Satellite (RISAT)-1
Earth observation satellite experienced a fragmentation
event on 30 September 2016 between 2:00 and
6:00 GMT due to an unknown cause. The spacecraft
(International Designator 2012-017A, U.S. Strategic
Command [USSTRATCOM] Space Surveillance
Network [SSN] catalog number 38248), operated
by the Indian Space Research Organization (ISRO),
carries a C-band microwave synthetic aperture radar.
The spacecraft had been on-orbit 4.4 years and was in a 97.6° inclination, 543 by 539 km orbit at the time of
the event.
Over 12 fragments were observed initially by
the SSN. However, as of 8 November, only one piece
(SSN 41797) had entered the catalog, having decayed
from orbit on 12 October 2016; the remainder have
decayed as well. At the current time, this event is
categorized as an anomalous separation of multiple high
area-to-mass ratio debris. Events like this are sometimes
referred to as a shedding event.

Source: The latest NASA Orbital debris quarterly report (attached)

Thanks to @Ohsin at Reddit forum for this.
« Last Edit: 02/01/2017 07:22 PM by vineethgk »

Offline vyoma

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Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #101 on: 02/01/2017 08:58 PM »
So.... RIP RISAT-1?

Offline russianhalo117

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Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #102 on: 02/02/2017 03:12 AM »
So.... RIP RISAT-1?
Not yet because it LOM has not been declared. Again it is shedding event and no indication yet that critical hardware detached. I'd wait a couple of weeks until impacts of operations are made known

Offline input~2

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Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #103 on: 02/02/2017 07:36 AM »
Well, the spacecraft (2012-017A/38248) is today in the same orbit as in August 2016, i.e. before the shedding event

Offline vineethgk

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Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #104 on: 03/28/2017 02:05 PM »
Risat-1 satellite is functioning normally, says Isro
Quote
The US space agency Nasa has reported that India’s earth observation satellite Risat-1 had experienced a “fragmentation event” in September last year, when pieces appeared to have broken off. The report, in Nasa’s quarterly magazine Orbital Debris, said the cause was not known. An Isro official said there was some anomaly which had been rectified, and the satellite was functioning normally.
Quote
It had been in space for 4.4 years when the incident reported by Nasa occurred. The magazine said Risat-1 experienced the fragmentation event between 0200 and 0600 GMT (7.30 am and 11.30 am IST). Over 12 fragments were observed by the Space Surveillance Network of the US, it said. By November 8, only one piece, designated SSN 41797, had entered the catalog, having decayed — from orbit on October 12, 2016. The other pieces had decayed — moved away from the satellite — as well. Eventually, space debris in the near earth orbit tends to enter the earth’s atmosphere and burn up.

The magazine said the event was categorised as an “anomalous separation of multiple high area-to-mass ratio debris”. Events like this are sometimes referred to as a shedding event. Nasa’s Space Debris Programme continuously tracks 17,000 space objects and maintains record of all space debris — non-functional objects in space — as well as operational satellites.

When contacted for clarification, Isro spokesperson Deviprasad Karnik said the satellite was functioning normally. He said Isro scientists had corrected some anomaly which had nothing to do with what was reported in the Nasa magazine.

Offline seshagirib

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Re: LIVE: PSLV C19 (XL) - RISAT-1 - April 26, 2012
« Reply #105 on: 03/30/2017 09:01 AM »
So.... RIP RISAT-1?
Not yet because it LOM has not been declared. Again it is shedding event and no indication yet that critical hardware detached. I'd wait a couple of weeks until impacts of operations are made known

It could be just some paint or insulating film peeling off.(?)

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