Author Topic: SSLV D2 - EOS-07, Janus-1, AzaadiSAT-2 - SHAR FLP - 10 Feb 2023 (03:48 UTC) (Read 48438 times)

zubenelgenubi · « **Reply #20 on:** 01/05/2023 07:26 pm »

Quote from: PM3 on 01/05/2023 03:43 pm

NET February:
Livemint, ISRO planning to launch second development SSLV flight in Feb: S Somanath [Jan 4]

Quote

On the SSLV, the space agency also plans to test the satellite-based Automatic Dependent Surveillance-Broadcast (ADS-B) receiver system, the senior official from ISRO [Somanath] said.

zubenelgenubi · « **Reply #21 on:** 01/27/2023 10:07 pm »

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.

Quote from: K210 on 01/27/2023 09:08 am

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While the main payload will be an Earth observation satellite — the EOS-7...
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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? 🛰

Quote from: russianhalo117 on 04/07/2022 03:15 am

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.

zubenelgenubi · « **Reply #22 on:** 01/27/2023 10:16 pm »

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?

Bean Kenobi · « **Reply #23 on:** 01/27/2023 11:09 pm »

Quote from: zubenelgenubi on 01/27/2023 10:07 pm

Do we know the identity of EOS-7? Or is this the only name for it?
Quote from: K210 on 01/27/2023 09:08 am
Quote
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.

russianhalo117 · « **Reply #24 on:** 01/27/2023 11:10 pm »

Quote from: zubenelgenubi on 01/27/2023 10:07 pm

Do we know the identity of EOS-7? Or is this the only name for it?
Quote from: K210 on 01/27/2023 09:08 am
Quote
While the main payload will be an Earth observation satellite — the EOS-7...
Quote
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? 🛰
Quote from: russianhalo117 on 04/07/2022 03:15 am
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.

Skyrocket · « **Reply #25 on:** 01/27/2023 11:14 pm »

Quote from: Bean Kenobi on 01/27/2023 11:09 pm

Quote from: zubenelgenubi on 01/27/2023 10:07 pm
Do we know the identity of EOS-7? Or is this the only name for it?
Quote from: K210 on 01/27/2023 09:08 am
Quote
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.

Bean Kenobi · « **Reply #26 on:** 01/27/2023 11:15 pm »

Quote from: Skyrocket on 01/27/2023 11:14 pm

Quote from: Bean Kenobi on 01/27/2023 11:09 pm
Quote from: zubenelgenubi on 01/27/2023 10:07 pm
Do we know the identity of EOS-7? Or is this the only name for it?
Quote from: K210 on 01/27/2023 09:08 am
Quote
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.

I know, and I agree.

zubenelgenubi · « **Reply #27 on:** 01/27/2023 11:22 pm »

Quote from: zubenelgenubi on 01/27/2023 10:07 pm

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.

TheVarun · « **Reply #28 on:** 02/01/2023 03:29 pm »

Preview of SSLV-D2, plus detailed explanations of the anomaly in SSLV-D1

https://www.isro.gov.in/mission_SSLV_D1_summary_D2.html

eeergo · « **Reply #29 on:** 02/01/2023 04:37 pm »

Quote from: TheVarun on 02/01/2023 03:29 pm

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.

Steven Pietrobon · « **Reply #30 on:** 02/02/2023 05:36 am »

Here's a PDF of the preview.

TheVarun · « **Reply #31 on:** 02/02/2023 06:09 am »

Does the Feb 10th-15th launch date still hold, or has it been postponed

Skyrocket · « **Reply #32 on:** 02/02/2023 07:04 am »

Quote from: TheVarun on 02/01/2023 03:29 pm

Preview of SSLV-D2, plus detailed explanations of the anomaly in SSLV-D1

https://www.isro.gov.in/mission_SSLV_D1_summary_D2.html

The EOS-07 shown in the small graphic looks the same as EOS-02 (Microsat 2A).
I presume, it is a reflight of the EOS-02 (Microsat 2A) payload.

russianhalo117 · « **Reply #33 on:** 02/02/2023 07:35 pm »

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.

FutureSpaceTourist · « **Reply #34 on:** 02/04/2023 06:44 am »

https://twitter.com/isrospaceflight/status/1621775560568619009

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Time for the first launch from India in 2023!

ISRO is targeting 10th February for the launch of SSLV-D2, the 2nd developmental mission of SSLV at 9:18 AM IST! It will place EOS-07 and 2 other payloads into Low Earth Orbit. #ISRO #SSLV

FutureSpaceTourist · « **Reply #35 on:** 02/08/2023 11:07 am »

https://twitter.com/isro/status/1623291583700381696

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SSLV-D2/EOS-07 Mission: launch is scheduled for Feb 10, 2023, at 09:18 hrs IST from Sriharikota

Intended to inject EOS-07, Janus-1 & AzaadiSAT-2 satellites into a 450 km circular orbit

Vehicle ready at the launch pad undergoing final phase checks

https://www.isro.gov.in/mission_SSLV_D2.html

TheVarun · « **Reply #36 on:** 02/08/2023 12:54 pm »

^ 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

Conexion Espacial · « **Reply #37 on:** 02/08/2023 04:25 pm »

ISRO Livestream

FutureSpaceTourist · « **Reply #38 on:** 02/09/2023 06:03 am »

Mission brochure

FutureSpaceTourist · « **Reply #39 on:** 02/09/2023 11:42 am »

https://twitter.com/isrospaceflight/status/1623662395003633664

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SSLV-D2's mission gallery is up! Check out these pictures of SSLV with its new paint scheme! #ISRO #SSLVD2
http://isro.gov.in/mission_SSLV_D2_Gallery.html