Primary payload for this mission will be EOS-7. Janus-1 along with a unnamed payload will be co-passengers.
Isros latest rocket, the Small Satellite Launch Vehicle (SSLV), is all geared for launch with the space agency aiming for an early February launch carrying three payloads. While the main payload will be an Earth observation satellite the EOS-7 the mission is also expected to launch Janus-1 from US firm Antaris and a third payload from a domestic player.
The Earth observation satellite SSLV is scheduled to carry will be in the small satellite class with its mass not exceeding 200kg, while the other two satellites sharing the ride will be smaller.
Source:
https://timesofindia.indiatimes.com/home/science/sslv-2nd-mission-to-carry-us-sat-eos-7-oneweb-sats-set-to-arrive-friday/articleshow/97357960.cms
Do we know the identity of
EOS-7? Or is this the only name for it?
Edit:
EOS-07 could be a duplicate or spare of
MicroSat 2A a.k.a.
EOS-02 lost in the SSLV D1 launch failure. The mass description would fit it.
While the main payload will be an Earth observation satellite the EOS-7...
The Earth observation satellite SSLV is scheduled to carry will be in the small satellite class with its mass not exceeding 200kg,...
Whatever happened to the two
Blacksky Global satellites that were stranded in India during the pandemic? 🛰
They were unable to access and collect their satellites during the pandemic shutdowns. The serial numbers BSG 5 and 6 have been stranded over there in storage whereas BSG 7 and 8 never made to ISRO Launch site before it shut down for the pandemic. As a result BSG 7 and 8 flew rideshare instead on the dedicated Starlink L9 flight.
Nextspaceflight.com shows the launch date and time as February 10 0330 UTC.
= 9:00 am IST
Is there a source, other than the NOTAM up-thread?
Do we know the identity of EOS-7? Or is this the only name for it?
While the main payload will be an Earth observation satellite the EOS-7...
At a time it was said to be the other name of Risat 2A.
Do we know the identity of EOS-7? Or is this the only name for it?
While the main payload will be an Earth observation satellite the EOS-7...
The Earth observation satellite SSLV is scheduled to carry will be in the small satellite class with its mass not exceeding 200kg,...
Whatever happened to the two Blacksky Global satellites that were stranded in India during the pandemic? 🛰
They were unable to access and collect their satellites during the pandemic shutdowns. The serial numbers BSG 5 and 6 have been stranded over there in storage whereas BSG 7 and 8 never made to ISRO Launch site before it shut down for the pandemic. As a result BSG 7 and 8 flew rideshare instead on the dedicated Starlink L9 flight.
As far as we publicly know they are still there.
Do we know the identity of EOS-7? Or is this the only name for it?
While the main payload will be an Earth observation satellite the EOS-7...
At a time it was said to be the other name of Risat 2A.
But RISAT 2A is far to large for a shared SSLV with 1200 kg. But i am not sure, if RISAT 2A is still an active program. Perhaps EOS 07 is now a designation for something else.
Preview of SSLV-D2, plus detailed explanations of the anomaly in SSLV-D1
https://www.isro.gov.in/mission_SSLV_D1_summary_D2.html
Thanks, great report!
If this explanation is indeed the whole story, it bodes well for a successful RTF.
Basically, the third stage separation mechanism (explosive) "rang" the vehicle stronger and longer than expected, saturating the on-board accelerometers and having the flight software disable them as giving wrong readings. The accelerometers still worked well once the vibrations dampened, so had the software foreseen this, they could have been used later. In any case, the software was then operating in open loop, not taking external sensor data, which meant it was navigating in the blind and being less accurate than it could be were the accelerometer data incorporated in the nominal closed loop guidance.
Finally, the kick stage VTM was purposefully not ignited due to concerns it would be detrimental to achieving orbit after an open-loop flight. Both the larger residuals and the VTM bypass led to an underspeed of ~56m/s.
They're changing the separation mechanism to a gentler one, as well as doing some structural changes to more rapidly dampen the offending oscillation. They're also modifying the flight logic in several parts, most notably relying on the accelerometers if they regain sanity after initial transients, and allowing VTM to function under some circumstances that may not jeopardize the mission further in case of upstream failures.
Here's a PDF of the preview.
Does the Feb 10th-15th launch date still hold, or has it been postponed
AFAIU:
Previously it was known as EOS-02R (Microsat 2AR) with R for replacement/reflight shortly after the SSLV D1 launch failure except that later they decided to no longer allow the reuse of designations once flown so it became EOS-7.
^ The total satellite mass adds up to 176.5 kg. Any ideas what makes up the shortfall in the stated payload of 334kg? Are there some experiments or dummy payloads on board