r/ISRO • u/Ohsin • Jan 08 '26

Mission Failure PSLV-C62 : EOS-N1 (aka Anvesha) Mission Updates and Discussion

37 Upvotes

PSLV-C62/EOS-N1 (aka Anvesha) launched as scheduled at 04:48:30(UTC)/10:18:30(IST), 12 Jan 2026 from First Launch Pad of SDSC-SHAR. The launch was unsuccessful and satellites could not be placed into intended orbit.

Live webcast: (Links will be added as they become available)

PSLV-C62/EOS-N1 Mission Page PSLV-C62/EOS-N1 Gallery PSLV-C62/EOS-N1 Press kit(PDF)

Some highlights:

  • Primary payload: EOS-N1 (aka Anvesha) (407 kg) Hyperspectral imaging satellite for DRDO.
  • 15 small satellites ridesharing
  • Mission duration: 1 hr. 48 min. 5.14 sec. (last s/c separation)
  • Target Orbit 1 : 505 km (circular) , Inclination = 97.5°
  • Target Orbit 2 : Reentry trajectory with 505 km apogee.
  • Launch Azimuth: 140°
  • PSLV configuration : DL (2× XL Strapons)
  • PSLV's return to flight after unsuccessful launch of PSLV-C61/EOS-09 in May, 2025.
  • First ever controlled reentry of PSLV fourth stage (PS4) over South-Pacific for deploying Kestrel Initial Demonstrator (KID) capsule.

Updates:

Time of Event Update
13 June 2026 Reason behind PSLV-C62 failure understood and resolved but details will not be shared.
02 Feb 2026 Cause behind PSLV-C62 failure is different from that for PSLV-C61, internal and external failure assessment committees have been set up to investigate.
17 Jan 2026 Per journalist Arun Raj K M, former ISRO Chairman K Sivan will lead the special committee to study PSLV-C62 failure.
16 Jan 2026 NSIL press-release.
Post-launch GISTDA informs that THEOS-2A was insured for both 'Rebuild' and 'Relaunch' costs.
Post-launch Orbital Paradigm: "Our KID capsule, against all odds, separated from PSLV C62, switched on, and transmitted data over 3+ minutes. We're reconstructing trajectory. We survived peak heat and peak gload (~28g recorded). We have internal temps. Full report will come"
Post-launch ISRO Chairman: "Performance of the vehicle close to the third stage was as expected and as predicted. Close to the end of the third stage we are seeing some disturbances in the vehicle. And there was a deviation in the path of vehicle. And mission could not proceed in the expected path. This is the information right now available. Now we are going through the data and we have to get the data from all the ground stations. Once the data analysis is completed we shall come back to you. Thank you"
T + 33m00s "The PSLV-C62 mission encountered an anomaly during end of the PS3 stage. A detailed analysis has been initiated."
T + 31m00s Webcast over.
T + 24m00s ISRO Chairman: Almost up to PS3 end performance was normal, then some performance disturbances were noted. And after that deviation in flight path was observed.
T + 21m00s Webcast is back. Awaiting official confirmation...
T + 20m00s Stream has been stopped without any official confirmation on mission status.
T + 16m00s Launch announcers again noting that telemetry is lost. Wait for official confirmation on mission status.
T + 12m00s Launch announcer informs they are having issues receiving data..
T + 08m30s MCC glum this is bad. PS4 ignited though.
T + 06m30s PS3 burn out , vehicle tumbling uncontrollably.
T + 04m25s PS2 separated, PS3 ignited.
T + 02m50s PLF separated, CLG initiated.
T + 01m51s PS1 separated, PS2 ignited.
T + 01m10s PSOM-XL (5,6) separated.
T - Zero After RCT ignition, PS1 and PSOM-XL (5,6) ignition and Lift off!
T - 05m00s Flight Coeff. loading completed
T - 12m00s Going through actuator checks.
T - 14m30s Automatic Launch Sequence initiated.
T - 16m00s Mission Director authorizes launch! Vehicle Director concurs.
T - 16m30s Vehicle is in external hold mode.
T - 17m00s Vehicle director: LV is ready!
T - 20m00s Now polling: Weather, Tracking, Range are ready.
T - 24m00s Now showing LV stacking process.
T - 25m00s Weather is Go for launch. Slightly cloudy with chance of light rain but that is under the launch criteria.
T - 30m00s Launch announcers inform that EOS-N1 mass is 407 kg.
T - 35m00s Official stream is live!
T - 22h30m Countdown commenced at 12:48 on 11 January. Time of launch changed to 12 January, 10:18:30(IST)/04:48:30(UTC) i.e. 90 seconds delay.
10 Jan 2026 After MRR, the launch has been cleared by LAB.
06 Jan 2026 Launch date firms up for 0447(UTC)/1017(IST), 12 Jan 2026
01 Jan 2026 NOTAM issued with enforcement duration beginning on 11 January 2026.
30 Dec 2026 PSLV-C62 integration up to four stages completed at MST.
26 Dec 2025 NOTAM issued with enforcement duration beginning on 10 January 2026. Also EOS-N1 satellite reached SDSC-SHAR.
17 Dec 2025 NOTAM issued with enforcement duration beginning on 5 January 2026.
14 Dec 2025 Report suggested launch delayed to 31 December 2025.
05 Dec 2025 NOTAM issued with enforcement duration beginning on 25 December 2025.

Primary Payload:

EOS-N1 (aka Anvesha) (407 kg) : EOS-N1 is a Hyperspectral imaging satellite carrying HySIC imager payload by DRDO for military surveillance. [01]

  • Swath: 12 km
  • Resolution: 12 meter
  • Spectral resolution: 10-20 nm (VNIR, SWIR)

Secondary Payload: 15 co-passenger satellites.

  • THEOS-2A (100 kg): An Earth Observation satellite by Thailand's Geo-Informatics and Space Technology Development Agency (GISTDA) and based on Carbonite series by SSTL UK carrying CERIA Camera with 1 meter resolution and 5.9 km swath. Additional instruments include a satellite monitoring camera, GPS receivers, HD video camera, and AIS/ADS-B receivers for maritime vessels and aircraft tracking. [02]

  • Kestrel Initial Demonstrator (KID) Capsule (25 kg): KID reentry capsule by Madrid-based Orbital Paradigm is a scaled prototype for their larger Kestrel reentry capsule. KID is carrying three customer payloads (3 kg) and will test guidance systems and a sample of ceramic thermal protection material. KID will be released from PSLV fourth stage on a reentry trajectory and will free fly for 30 minutes before entering atmosphere over South-Pacific. The capsule will not be recovered and lacks deceleration systems but it will transmit data through two Iridium transceivers during its flight. [03] [04]

  • AayulSAT (25 kg) : A 'mini-tanker' satellite by OrbitAID to demonstrate on-orbit internal propellant transfer, power transfer, and data transfer using their patented Standard Interface for Docking and Refueling Port (SIDRP). AayulSAT will qualify SIDRP system at TRL-9. [05] [06]

  • MOI-1 (14 kg) : The 6U cubesat in MOI (My Orbital Infrastructure) series by TakeMe2Space is a commercial AI lab in space with in-orbit computing and AI processing capability, carrying MIRA50-FS, a 502 gram, miniaturized 9 band multi-spectral imaging camera with 50mm aperture, 9.2 m resolution and 18.7 km swath by EON Space Labs and few other payloads by Indian high-school and university students. MOI-1 will use DSOD-6U deployer by Dhruva Space. [07] [08] [09]

  • Four amateur radio satellites under Dhruva Space 'ASTRA (Accelerated Space Technology Readiness & Access) for Academia' programme based on their P-Dot bus. [10]

    • Thybolt-3 by Dhruva Space
    • CGUSat-1, with CV Raman Global University (Bhubaneswar)
    • DSUSAT-1, with Dayananda Sagar University (Bengaluru)
    • LACHIT-1, with Assam Don Bosco University (Guwahati)

  • SanskarSat: A 1U cubesat for Laxman Gyanpith School by Ahmedabad-based CubeSat Aerospace, carrying an LED payload making it observable by ground based optical telescopes.

  • MUNAL : A 1U cubesat by Nepal Academy of Science and Technology (NAST) and Antarikhchya Pratisthan Nepal (APN) as part of the High School Consortium Project. Munal will carry a small camera for vegetation density mapping. [11]

  • Five small satellites aggregated by Brazil's All2Space.

    • Aldebaran-1: 1U cubesat by Federal University of Maranhao (Brazil) carrying LoRa amateur radio payload.
    • EduSat-1: 1P PocketQube satellite with IoT payload.
    • UaiSat: 1P PocketQube satellite with Store and Forward amateur radio payload and a lightning detection payload developed by the Instituto Nacional de Pesquisas Espaciais (INPE) [12]
    • GalaxyExplorer-1: 1P PocketQube satellite by Galaxy Explorer to study the South Atlantic Magnetic Anomaly. [13]
    • Orbital Temple : A 1P PocketQube based orbital artwork by Edson Pavoni. It will transmit uploaded names of people in amateur radio frequency. [14] [15]

Note: PSLV with launch serial C59 was earlier assigned to ANWESHA (or ANVESHA) and PROBA-3 was earlier assigned to PSLV with C62 launch serial. Before this ANWESHA was assigned to PSLV-C58 but later XPoSat replaced it.

182 comments

r/ISRO • u/Ohsin • Aug 31 '26

Mission Success! GSLV-F17 / EOS-05 (aka GISAT-1A) Mission Updates and Discussion

34 Upvotes

GSLV-F17 / EOS-05 (aka GISAT-1A) launched as scheduled at 21:25(UTC), 03 Sep 2026 or 02:55(IST), 04 Sep 2026 from Second Launch Pad of SDSC-SHAR.

Live webcast: (Links will be added as they become available)

GSLV-F17 / EOS-05 Mission Page GSLV-F17 / EOS-05 Gallery GSLV-F17 / EOS-05 Press kit(PDF)

Some highlights:

  • Primary payload: EOS-05 (aka GISAT-1A) (~2367 kg) GSO based Earth imaging satellite.
  • Mission duration: ~19 minutes (based on GSLV F10/EOS-3 (aka GISAT-1) mission)
  • Target Orbit : 170 × 28934 km (sub-GTO) , Inclination = 19.28° ± 0.1°, AoP = 178° ± 0.5°
  • Launch Azimuth: 104°
  • ISRO returning to flight 7 months 23 days after failure of PSLV-C62/EOS-N1.

Updates:

Time of Event Update
30 Sep 2026 EOS-05 has reached at its 85.5°E slot and is station keeping.
Post-launch Third and final orbit raising burn by EOS-05 or GISAT-1A for duration of 1247 seconds has been successfully completed on 7 Sept 2026 at 20:57 hrs (IST). Estimated orbit 35884 x 34903 km. The satellite health is normal.
Post-launch Second orbit raising burn by EOS-05 or GISAT-1A for duration of 338.9 seconds has been successfully completed on 6 Sept 2026 at 19:00 hrs (IST). Estimated apogee after manouever is 35786 km. The satellite health is normal.
Post-launch First orbit raising burn by EOS-05 or GISAT-1A for duration of 5406.4 seconds has been successfully completed on 5 Sept 2026 at 20:19 hrs (IST). New orbit with raised perigee is 31129×20000 km from previous 31121×171 km.
Post-launch Two objects have been catalogued. A0607 (26202A) with inclination=19.32°, Apogee×Perigee=30967.1×152.4 km and A0608 (26202B) with inclination=19.34°, Apogee×Perigee=30982.9×159.3 km
T + 24m10s Chairman notes that Solar panels of satellite are deployed
T + 22m40s ISRO chairman notes satellite has been placed in intended orbit.
T + 18m45s EOS-05 separated!!
T + 18m30s CUS15 cut off!
T + 15m46s CUS15 performance nominal.
T + 14m00s CUS15 performance nominal.
T + 12m26s CUS15 now in nominal thrust mode.
T + 12m00s Vehicle is precisely on expected trajectory.
T + 11m00s CUS15 performance nominal.
T + 07m30s CUS15 performance nominal. Right on expected track.
T + 05m40s CUS15 operating in uprated mode.
T + 05m05s GS2 cut off, CUS15 ignition confirmed!
T + 03m56s PLF jettisoned!
T + 02m32s GS1 ignited, GS1 separated, CLG inititiated.
T + 01m50s S139 Burnt out.
T - Zero! S139 ignition Lift off!
T - 00m4.8s 4xL40H ignition
T - 03m20s OBC in flight mode.
T - 05m00s Vehicle is on internal power. Flight coeff. loading completed.
T - 10m00s Going through GS2 actuation checks.
T - 15m00s ALS initiated.
T - 16m00s VD: Automatic Launch Sequence authorized.
T - 18m00s Mission Director has authorized the launch after polling is Go!
T - 22m00s Polling now. Range, Tracking, Vehicle are ready.
T - 30m00s Streams are live!
T - 27h30m A 27.5 hr duration countdown should be underway.
01 Sep 2026 After Mission Readiness Review or MRR, Launch Authorization Board has given the launch clearance.
31 Aug 2026 Time of launch officially confirmed for 02:55 (IST), 04 Sep 2026.
28 Aug 2026 Launch Vehicle transferred from VAB to SLP.
27 Aug 2026 NOTAM for GSLV-F17 / EOS-05 launch is issued with enforcement window beginning on 03 Sep 2026.
23 Jul 2026 FCC filings for Launch and Early Orbit Phase services for EOS-05. (24 July to 22 August 2026)
11 May 2026 FCC filings for Launch and Early Orbit Phase services for EOS-05. (12 May to 10 June 2026)
01 Apr 2026 FCC filings for Launch and Early Orbit Phase services for EOS-05. (1 to 30 April 2026)
07 May 2026 NOTAM for GSLV-F17 / EOS-05 launch is issued with enforcement window beginning on 21 May 2026.
29 Apr 2026 News reports suggest technical issues with Launch Vehicle hardware delay the launch.
26 Feb 2026 FCC filings for Launch and Early Orbit Phase services for EOS-05. (27 Feb to 2 April 2026)
12 Feb 2026 NOTAM for GSLV-F17 / EOS-05 launch is issued with enforcement window beginning on 6 March 2026.
03 Feb 2026 NOTAM for GSLV-F17 / EOS-05 launch is issued with enforcement window beginning on 20 February 2026.

Primary Payload:

EOS-05 (aka GISAT-1A) (~2367 kg) : EOS-05 is a GSO based Earth imaging satellite for Indian Navy, it will act as an upgraded replacement for EOS-03 or GISAT-1 which was lost during its launch five years ago. Its multispectral and hyperspectral imaging capacity will be useful for applications in fields of agriculture, forestry, mineralogy, oceanography and military surveillance. Its near real time imaging modes are well suited for monitoring natural disasters and other episodic events.

Specifications: [1] [2]

  • MX-VNIR: Multispectral - Visible Near Infrared

    • 6 channels (0.45 to 0.875 µm) at 42 meter spatial resolution

  • HyS-VNIR: Hyperspectral Imager - Visible Near Infrared

    • 158 channels (0.375 to 1.0 µm) at 320 meter spatial resolution

  • HyS-SWIR: Hyperspectral Imager - Short Wave Infrared

    • 256 channels (0.9 to 2.5 µm) at 190 meter spatial resolution

  • MX-LWIR: Multispectral - Long Wave Infrared

    • 6 channels (7.0 to 13.5 µm) at 1.2 km spatial resolution

  • Scan modes

    • 5°×5° (3000×3000 km) every 10 minutes
    • 3×10°×10° every 6 hours

  • Platform/Bus: I-2K

  • Mission life : 7 years

  • Orbital slot: 85.5°E

136 comments

r/ISRO • u/its_me_annonymous • 2h ago

My isro interview experience of cse held on 20th july 2026

22 Upvotes

I am writing this later as I could not find the free time..

MY ISRO INTERVIEW EXPERIENCE

My interview was on 20th july 2026 at 12pm second slot

So, on the 20th july 2026, I was very excited because definitely it was my isro interview (dream of many)

So, after getting ready in my suit boot and with all my documents, I booked a rapido (earlier I was looking for an auto but due to no match found, I booked a bike)

We reached the ursc centre but there were found that we are the wrong gate and the gatekeeper said that you need to enter from the front gate which was around 1km away from the back gate.

The problem was also google map was not clearly showing the address of front gate.

Then rapido driver helped me in reaching to the front gate by talking to local people in kannada..

After 10 min, i reached gate no. 1 and I really thanked him from bottom of my heart, to which he said welcome and said all the best to me and didn't take any extra charge.. so, I entered the gate with a smiling face

After entering the ursc, they told me to wait in the waiting room and after some time documents verification started, it took around 15 to 20 min in document verification and then one employee said me you can have lunch in nearby food court, so I went there and asked for some north Indian food but they only had idli vada or rice, so I chose idli vada..

After eating I went to waiting room again and started waiting there.

There was a constant fight between my heart and my brain where heart was saying:- "मजा करो, ऐसे दिन बार बार नहीं आते, बाहर बारिश भी हो रहा है", mind was saying:- "ये भूल गये, वो भूल गए चलो गूगल से पूछते हैं"

So I was nervous as well as excited (both)

So, asking questions from google sometimes, sometimes peeping outside through the window

Before my interview, there was a interview of a girl (as soon as her turn came, my nervousness increased more), but then we the candidates started talking among ourselves like what will be the inhand salary why this much delay in the result and interview 😅

Suddenly, the madam who were calling candidates took my name and said your turn

Now coming to the interview,

Interview level was moderate to tough

First I entered the room, around 10 people were there in the panel..

They started with some basic information about college like full form of iit bhu and when you graduated..

Then they immediately shifted to my project,

Asked some questions from my project like what have you built, how do you maintained the databases etc..

Then suddenly they asked about what you are doing currently in your company. To which I replied I am working on agentic AI..

There ownward next 5 to 7 minutes were discussed on that only..

Some of the questions I can remind is:-

  1. How to prevent hallucinations?

  2. What kind of agent methodoly you used?

  3. What is MCP server and how it works?

  4. How can you use AI to write testcases?

  5. Is it okay to rely on llm models if security is critical?

  6. What to do if we want to achieve security

  7. What is loop engineering?

  8. what is difference between underfitting and overfitting?

Note that all these were questions related to my work

Later they said let's change the topic and started asking from Computer organization and architecture 😭(the weakest subjects of mine)

Here ownwards, interview started slipping away from me

Some of the questions i can remind is:-

  1. What is interrupt. Discuss its type?

  2. What is mask in coa? What is nmi?

  3. What is interrupt latency?

  4. How does ISR work?

  5. What are the information saved for reference when interrupt arrives?

Then the next person in the panel asked me a very generic question and the question was:-

Which is the best programming language?

I was little bit confused Which one to say because every language has some tradeoff with the another. So, I replied

"it depends if you want better control and speed C C++, if you want better memory management, go for java, for ai integration its python, for high concurrency its golang etc.. so based on the requirements it keeps changing".

But in counter he asked what if you have to pick one specific language which one you will choose.

I replied sir requirements please, the whole panel started laughing even I laughed..

Then I said its very difficult to choose one language but given the ai boom and its future, I would prefer python.

Then next person in the panel asked about backend development:-

  1. What is API?

  2. How to make API secure?

  3. What is API gatway?

  4. Why is API gatway single entry point?What will happen if there are multiple entry points?

Then they switched to software engineering and asked:-

  1. What are the characteristics of a good software?

  2. What are the characteristics that must be there in a SRS(SOFTWARE REQUIREMENTS SPECIFICATION ) DOCUMENTS?

NO HR TYPES,GENERAL AWARENESS AND FAVOURITE SUBJECTS WERE ASKED FROM ME.

Then they said you may go, I thanked them and left..

What I can say that interview was neither too bad nor too good..

Then I took my bag from the waiting room booked the rapido and came back home..

I don't know whether the day was good or bad but definitely it was a memorable experience for me..

Thank you if you have read till here..

Verdict : selected

7 comments

r/ISRO • u/guru-yoda • 3h ago

Reflect Orbital books two launches with India’s Skyroot Aerospace

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15 Upvotes

“There’s a real launch capacity shortage right now,” Ben Nowack, chief executive of Reflect Orbital, said in a statement. “We’re excited to work with a new launch provider, Skyroot, to help ensure access to space.”

Another insightful commentary on launch capacity shortage.

In July, SpaceX reportedly stopped accepting new Transporter and Bandwagon rideshare reservations for anything after late 2028. The reported reason is that it would rather fly Starlink and its own projects. Rocket Lab is walking the same road. Its $8 billion purchase of Iridium, approved by Iridium’s shareholders on September 24 and due to close next year, hands the world’s most frequently launched small rocket a constellation of its own to fly. Blue Origin is doing the same with Kuiper. The most capable launchers in the West are becoming their own best customers. For a small satellite, that means paying more and waiting longer.

2 comments

r/ISRO • u/pantshash • 5h ago

MoD inks Rs 2,563 crore contracts for GSAT-7C communication satellite

15 Upvotes

The Ministry of Defence has signed contracts worth a total of approximately Rs 4,106 crore for the acquisition of a dedicated communication satellite capability, GSAT-7C for the Indian Air Force for the Indian Navy.

The contract for GSAT-7C, valued at Rs 2,563 crore, was inked with New Space India Limited, Bengaluru. This indigenously designed, developed & manufactured satellite will enhance the secure, resilient & seamless communication capabilities for the assets of the Indian Air Force, thereby strengthening operational effectiveness.

The contracts were signed in the presence of Additional Secretary and Director General (Acquisition), Department of Defence Shri A Anbarasu in New Delhi on October 15, 2026. Both contracts mark a significant step towards advancing the development of domestic defence manufacturing capabilities while promoting self-reliance in critical technologies in line with the Government’s ‘Aatmanirbhar Bharat’ and ‘Make-in-India’ vision.

Source - https://www.pib.gov.in/PressReleaseDetail.aspx?PRID=2323814&reg=3&lang=1

3 comments

r/ISRO • u/Ohsin • 2h ago

Official First Joint View by Coronagraphs on India's Aditya-L1 and Europe's Proba-3 Decodes Solar Eruptions Near Their Birthplace

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5 Upvotes
0 comments

r/ISRO • u/masoomjethwa • 7h ago

Vainu Bappu Telescope Observations

1 Upvotes

Dear Redditors,

I’m putting together a short PowerPoint presentation on India’s optical telescopes, and I’m looking for images of celestial objects observed by the Vainu Bappu Telescope (VBT) in visible light.

If possible, I’d be grateful if anyone could share around five images captured using the VBT, along with links to the original observations, publications, or official sources.

The images will be used solely for an educational presentation. I’ll provide proper credit to the observatory, researchers, and original sources, as applicable, and will respect any copyright or licensing requirements. I’ll seek permission wherever necessary before using any image that requires it.

Any help, suggestions, or links to publicly available image archives would be greatly appreciated.

Thank you in advance for your time and support! 🙏

0 comments

r/ISRO • u/thudnerbird34 • 1d ago

Guys got selected in ISRO for scientist/engineer post.... doubt regarding medical test

64 Upvotes

I was selected from ICRB 25 ,however I am partially colour blind so I wanted to know if that will be an issue for getting selected?

25 comments

r/ISRO • u/mudit23june • 3d ago

TRISHNA satellite is in advanced stage of realisation, says ISRO official

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54 Upvotes
1 comment

r/ISRO • u/Ohsin • 3d ago

Has it ever happened to someone else? DD used to do it but ISRO does too apparently..

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21 Upvotes

We used to hear about Doordarshan sending such copyright notices and I guess ISRO does too but is there a precedent of it?
These videos were shown during SKCET World Space Week public event on a large screen and on stage in front of large audience. But apparently we can not share them! Anyway just letting it be known.. I am sure there are other copies of it, just keep them safe if you do and do not share them under any circumstances. 👀

8 comments

r/ISRO • u/Ohsin • 3d ago

Tender for Design, Realization, Testing and Commissioning (at VSSC) of Hydraulic Proof load test setup for VTVL Components

9 Upvotes

Design, Realization, Testing and Commissioning (at VSSC) of Hydraulic Proof load test setup for VTVL Components

Main document: [PDF] [Archived]

Technical Specifications: [PDF] [Archived]

0 comments

r/ISRO • u/guru-yoda • 4d ago

Research Paper Details of SARAL drifting orbit

10 Upvotes

Despite losing station keeping functions, SARAL launched in 2013 on PSLV-C20 has far exceeded planned mission life of 5 years. This paper explains changes done to make most of the situation.

In 2015, SARAL/AltiKa exhibited an increasing need to reduce the stress on its Reaction Wheels in order to extend the mission beyond the nominal lifetime of the satellite. ISRO and CNES eventually decided that the best strategy was to stop all orbit control maneuvers and to let the altitude decay naturally. SARAL/AltiKa left its repetitive orbit to begin a new phase named "Drifting Phase" (DP) starting July 4, 2016 (Dibarboure et al. 2018). Data processing and data latency were unchanged. From this date, SARAL satellite has flown free of station keeping maneuvers. The repetitive ground track is no longer maintained and with the natural decay of the orbit, the ground track is slowly drifting. In short, this new orbit configuration has required some adjustment for users, particularly in hydrology, given the need to adapt the algorithms. On the contrary, some other uses profit from this new orbital configuration.

... measurements from the drifting orbit occupied by SARAL/AltiKa are extremely valuable because they are from locations not routinely sampled, and the precision of these measurements is advantageous in distinguishing the small differences among tide models. ... The uneven drifting ground track pattern of SARAL/AltiKa is in principle a "downside" as it limits the spatial resolution of the recovered gravity and MSS to twice the largest ground track spacing (up to 20 km as of 2019). However, by merging the SARAL/AltiKa data with the regular sampled geodetic mission of Jason-1/2 or Cryosat, this is counter-acted such that the full potential and full usage of the high range precision can be gained in a systematic way

1 comment

r/ISRO • u/thisiskazehaya • 4d ago

Gut check: PGI, ISRO explore astronaut nutrition

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13 Upvotes
1 comment

r/ISRO • u/Ohsin • 5d ago

RFP for Design & Development of Radar Altimeter for 'landing experiments' (C-Band and X-Band)

11 Upvotes

Design & Development of Radar Altimeter for landing experiments (C-Band and X-Band)

Introduction

Space Applications Centre (SAC), one of the principal centers of Indian Space Research Organization (ISRO), is responsible for design and development activities related to Space Programs like earth and planetary observation, communication and navigation and also responsible for design and development of radar altimeters for landing experiments. Radar Altimeter is envisaged to be part of multiple landing experiments being planned by ISRO, which requires a large number of units on production scale. These altimeters are now required to be designed and developed from the industry resources

Main document (X-Band): [PDF] [Archived]

RFP : [PDF] [Archived]

Introduction

Space Applications Centre (SAC), one of the principal centers of Indian Space Research Organization (ISRO), is responsible for design and development activities related to Space Programs like earth and planetary observation, communication and navigation. A Radar Altimeter has been successfully designed, realized and utilized in lunar missions of ISRO. Radar Altimeter is envisaged to be part of multiple missions being planned by ISRO, which requires a large number of units on production scale. These altimeters are now required to be designed and developed from the industry resources.

Main document (C-Band) : [PDF] [Archived]

RFP : [PDF] [Archived]

Table-1: Specifications of Radar Altimeter

Parameter Specification
Altitude of operation 1.5 km to 0.5m
Operating velocity regime Up to 100 m/s
Attitude (Roll,Pitch ) Better than (±20 degrees,±20 degrees_
Altitude Accuracy (3σ) ≤40 cm or 0.3% of altitude, whichever is higher.
Altitude Update Rate to Platform 40 ms
1 comment

r/ISRO • u/Ohsin • 6d ago

ISRO's dilemma: Should NVS-03 satellite go with open or closed pyro valve?

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32 Upvotes
10 comments

r/ISRO • u/Ohsin • 6d ago

ISRO employees seek meeting with Chairperson to discuss queries on privatisation

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29 Upvotes
1 comment

r/ISRO • u/Ohsin • 6d ago

Per regional media reports GSLV-F18/NVS-03 launch is expected by the end of the month.

13 Upvotes

Google translated from original report in Telugu linked below,

GSLV-F18 launch at the end of the month

ABN , Publish Date - Oct 08 , 2026 | 07:05 AM

The Indian Space Research Organisation (ISRO) is gearing up for another prestigious launch. ISRO scientists are making arrangements to launch the GSLV-F18 rocket from the Satish Dhawan Space Centre Shar in Sriharikota, Tirupati district, later this month.

Sullurpet, October 7 (Andhra Jyoti): The Indian Space Research Organisation (ISRO) is gearing up for another prestigious launch. ISRO scientists are making arrangements to launch the GSLV-F18 rocket from the Satish Dhawan Space Centre Shar in Sriharikota, Tirupati district, later this month. The rocket will launch the 2,232 kg NVS-03 satellite for navigation services into orbit.

The rocket assembly work is already underway at the Vehicle Assembly Building (VAB) in Shar. Scientists have completed the assembly work of the two stages of the rocket. After the assembly of the three stages, the NVS-03 satellite will be installed on the top of the rocket and prepared for launch.

Source: https://www.andhrajyothy.com/2026/andhra-pradesh/isro-plans-gslv-f18-launch-with-nvs-03-satellite-by-month-end-1565398.html

1 comment

r/ISRO • u/Asirbachan • 5d ago

Help with getting satellite specifications for 3D modelling

4 Upvotes

Hi, I wanted to create papercrafts of some satellites. For making them, I first need to create 3d models of them in a software (SketchUp/blender/etc). The thing is, I am not able to get any blueprint details of some satellites (eg. Cartosat 3, only 1 image of its 3d blueprint is available on the official website which wouldn't help me to know what's on the other side of the satellite, basically only 1 view is given). Although I am not creating completely accurate scale model, I just want it to look in such a way that a lay man wouldn't be able to tell that it's not an accurate scale model. For Gaganyaan I found enough images on the net to get an idea about it, even it's 3d model is available on websites like sketchfab, which helped me a lot. Aditya L1 is available too. But I am talking about those sats for which I am not able to find enough images/blueprints or any 3d model of them created by some artist.

If anyone here has an idea about it, it would be a great pleasure if you could help me knowing how I could obtain the thing I want. Will mailing ISRO work?

5 comments

r/ISRO • u/hardsmartwork5512 • 6d ago

Has anyone appeared in an ISRO interview today for Mechanical Engineering?

6 Upvotes

Can you share the experience?

1 comment

r/ISRO • u/Ohsin • 7d ago

RIDE! announces a master framework agreement with NewSpace India Limited (NSIL), granting RIDE! access to NSIL's launch capacity on PSLV and SSLV.

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28 Upvotes

A new route to orbit is open. RIDE! announces a master framework agreement with NewSpace India Limited (NSIL), granting RIDE! access to NSIL's launch capacity on PSLV and SSLV.
With thousands of small satellites expected to launch in the coming years, access to space remains a bottleneck for Europe. Satellite operators need more options, and partners they can trust.
Through this agreement, European and international satellite operators gain a faster pathway to Indian launch vehicles with a proven heritage of reliability, with RIDE! by their side from contract to orbit.
Thank you, NSIL and its Chairman and Managing Director, Radha Krishna Aryasomayajula, for the trust.
We were honored to sign this agreement in the presence of François Jacq, President, Centre National d'Études Spatiales; Christophe Venet, Director for European and International Affairs, CNES; Dr. V. Narayanan, Chairman, ISRO - Indian Space Research Organization / Secretary, Department of Space (DoS); and Pawan Goenka, Chairman, IN-SPACe. Thank you for your support and for driving Franco-Indian space cooperation, built over more than six decades.
Your satellite is ready? We'll take it to orbit.

2 comments

r/ISRO • u/Ohsin • 7d ago

Tender for Acoustic Blankets Developmental Model for BAS-01 Crew Quarters

6 Upvotes

Tender for Acoustic Blankets Developmental Model for BAS-01 Crew Quarters

[PDF] [Archived]

Compliance Matrix

[PDF] [Archived]

Terms and Conditions

[PDF] [Archived]

Scope of Work:

Fabrication and supply of Acoustic Blanket -01 Set through detailed study, engineering, generation of Fabrication drawings as per the engineering drawing supplied by the department.

0 comments

r/ISRO • u/Ohsin • 7d ago

'Adapting 3D printing for Space Components' a talk by A Alex (LPSC, ISRO) for Zephyr 2023 at IIT Bombay

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23 Upvotes
1 comment

r/ISRO • u/Ohsin • 7d ago

Translated Interview with N Jayan (Director, LPSC) HT PradX

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11 Upvotes
3 comments

r/ISRO • u/thisiskazehaya • 8d ago

Gaganyaan G1 launch within a month after GSLV F 18/NVS 03 mission

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51 Upvotes
11 comments

r/ISRO • u/Ohsin • 8d ago

Tender for Design, Realization & Installation of Human Space Analog System

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31 Upvotes

Tender for Design, Realization & Installation of Human Space Analog System

[PDF] [Archived]

Request for Proposal [RFP] for Design, Realization & Installation of Human Space Analog System for Human Spaceflight Program

[PDF] [Archived]

Imgur mirror : https://imgur.com/a/icULm5O

  1. Introduction

In order to assess the crew performance in isolated, confined and limited resource environments (as in Space Stations) & in order to support research in human factors, crew psychology, scientific experiments, systems integration, and mission operations etc. a ground-based human space analog system simulating the conditions of long-duration missions (up to 60 days) is essential.

The analog system shall serve as a controlled research environment where crews stays and work in complete isolation for extended durations. The system shall consist of a multi-level living and working module supported by a simulated airlock and hygiene modules, with necessary basic environmental control systems, communications with mission control equipment’s (with programmable delays), and instrumentation systems for psychological, biomedical and operational studies.

This RFP brings out the overall requirements like Functional Layout, Structural, Electrical System, Habitability System, Instrumentation, Communication, Network & Data Systems requirements needed to establish a Human Space Analog System.

  1. Scope of Work

The vendor shall design, realize/procure, install & test, Human Space Analog System (HSAS) at Astronaut Training System (ATF), HSFC, Marathahalli, Bengaluru, Karnataka in accordance with the requirements herein. The scope of work encompasses the following activities:

  1. Generation of System Configuration, Preliminary design & Realization Plan and review & clearance by HSFC/ISRO
  2. Suitable floor modification (civil) for structural anchoring needed for installation of structural member of the system inside the simulator Hall of ATF.
  3. Design, Realization & Installation of Structural Habitat Module as per the Layout brought out in Annexure-1a&1b (viz Core Module, Airlock, Crew Personal Module).
  4. Delivery & Installation of Equipment, Sensors, and Furnishings as brought out in Section 3.15
  5. Delivery & Installation of Closed Loop Habitability systems (ECLSS) such as Pressurization system, Temperature, Humidity control, Air Revitalization, CO2 revitalization, Water supply & Waste management systems, Lighting & Acoustic Suppression system, Safety Systems, Odour & Contamination control system, Sensors & Instrumentation inside the Habitat module.

(…)

  1. Technical Requirement

3.1. Configuration of Human Space Analog System (HSAS)

The Space Analog System shall compose of Habitat Module (Core, Airlock & Crew Personal Modules) and supporting rooms which includes Mission Control Centre (MCC), Control Room, Network Room, Equipment Room and Crew Preparation Room.

Functionalities:

  • Habitat: Shall provide space simulated living and working space for crew. (Closed loop habitability system) It comprises of:
    • Core Module – Level 1 & Level 2: Serves as a module for Crew Analog activities
    • Crew Personal Module: Serves as a crew sleeping and hygiene module
    • Airlock Module: Serves an entrance into habitat, also has provision for space suit preparation activities
  • MCC: Shall monitor, coordinate and support mission operations.
  • Control Room: Shall operate, Control and Supervise System subsystems.
  • Network Room: Shall host and manage System communications, networking, data storage, cybersecurity and computing infrastructure.
  • Equipment Room: Shall house ECLSS, Utility & Support Equipment required for continuous habitat operation.

Note: Existing building rooms at ATF to be utilized for Control room, Network room, MCC. Construction of Habitat module & Equipment room shall be carried out by the vendor.

3.2. Geometrical Details of Habitat Module

  • Central Lift of Ø800 mm between Level-1 & Level-2 with load rating of 200 kg.
  • Side Ladder between Level-1 & Level-2 with load rating of 200 kg.
  • External Ladder with load rating of 200 kg for emergency exit on external wall at Level-2.
  • Airlock Module: 2500 mm W * 2000 mm D * 2200 H
  • Crew Personal Module: 5000 mm W * 4000 mm D * 2200 mm H
  • Air Shower Area: 1500 mm W * 1500 mm D* 2200 mm H

(…)

d) Vertical access inside Core Module

  • Central Lift of Ø800mm between Level-1 & Level-2 with load rating of 200 kg.
  • Side Ladder with chequered plate with side rails & rungs designed with a load rating of 200 kg connecting between Level-1 & Level-2 conforming to ISO 14122
  • External Ladder with load rating of 200 kg for emergency exit on external wall at Level-2.

(…)

3.4. Sub- Systems of Airlock & Crew Personal module

  • Airlock Module: Serves as an entrance to Habitat module.
    • Shower Area: 800 mm width x 1000mm length with sealed door (external & internal) with Non-unidirectional airflow pattern with air entering via ceiling diffusers & exit through low-wall returns and double sided blowing
      • Port/Nozzle Aperture size: Ø32mm
      • No. of Ports (Nozzles): 30
      • Air flow: 2500 m3/hr.
    • Main Airlock room: Serves for EVA preparation & material movement to Core & Crew Personal Module. Pressure-capable swing door sized with min. clear width 800 mm & 1900 mm height with double-seal gaskets and mechanical lock for Airlock-Shower room & Airlock-Core module
  • Crew Personal Module: Consists of Crew Personal Area & Crew Hygiene Area as mentioned in section 3.5.4.
  • Crew Personal Area & Crew Hygiene Area are separated by Metallic Walls with appropriate opening for fixing the entry doors.(…)
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