ISRO successfully hot tested the Semicryogenic Engine PHTA at full 200T thrust for the first time at IPRC Mahendragiri. 35s test, 5s at 100%. Ninth PHTA test. SE2000 will power the SC120 stage replacing L110 on LVM3. #ISRO #SE2000 #LVM3 #Semicryogenic

Mission accomplished! Congratulations to ISRO and everyone behind GSLV-F18 / NVS-03 on successfully placing the satellite into its intended orbit! 🇮🇳 Thank you to everyone who followed the launch with us on our Flight Profile dashboard. Tomorrow, we’ll share the actual trajectory data and compare it with our predictions to see how closely they matched. indianspaceflight.in/flight-… #ISRO #GSLVF18 #NVS03 #NavIC

Less T-4 minutes to liftoff of GSLV-F18 / NVS-03! The Automatic Launch Sequence has started following launch authorisation from the Mission Director and Vehicle Director. Join us for ISRO’s launch stream alongside our detailed 3D mission visualisation. Let’s watch together! 🇮🇳 💻 Open on a laptop or desktop: indianspaceflight.in/flight-… #ISRO #GSLVF18 #NVS03 #NavIC

LIFTOFF! GSLV-F18 rises from Sriharikota carrying NVS-03, on its way to help replenish the baseline NavIC constellation! 🇮🇳 Follow the mission with us: indianspaceflight.in/flight-… #ISRO #GSLVF18 #NVS03 #NavIC

Simple video guide that explain all the controls and navigation on indianspaceflight.in/flight-….

Welcome to our launch coverage! It’s 11 pm IST, and we’re less than an hour away from the GSLV-F18 / NVS-03 mission, a step towards replenishing NavIC’s baseline constellation. The latest weather update we have, from 10 pm, shows clear skies over Sriharikota, 29°C, winds of 14 km/h and a 1% chance of precipitation. Join us for the launch stream, detailed 2D/3D mission visualisation, expected flight profiles and stage events, all in one dashboard. Open on a laptop or desktop. Mobile support is in the works! indianspaceflight.in/flight-… #ISRO #GSLVF18 #NVS03 #NavIC #IndianSpace

🚀 Watching the GSLV-F18 / NVS-03 mission? Follow along with our dedicated launch dashboard, bringing the launch stream and detailed mission visualisation together in one place. Explore 2D/3D views, the estimated orbit, expected altitude and velocity profiles, stage events, ground-station tracking and mission replay, all alongside the stream. We’ve put a lot of detail into this. Come check it out and tell us what you think! 💻 Use a laptop or desktop. Mobile isn’t supported yet, but we’re working on it. indianspaceflight.in/flight-… #ISRO #GSLVF18 #NVS03 #NavIC #IndianSpace

We questioned what was actually aboard EOS-05. Then we took those questions to ISRO through RTI. Our original article flagged that the widely repeated instrument specifications belonged to the lost EOS-03 / GISAT-1. Had the payload changed? We explicitly raised added thermal capability as one possibility. ISRO’s reply now confirms: EOS-05 carries a six-band long-wave infrared imager that EOS-03 did not have with 1,180 m resolution and a 378 km swath. This establishes an important difference between the two spacecraft: EOS-05 has thermal imaging capability that extends observation beyond daylight. It also corrects our earlier article’s statement that EOS-05 had no thermal band. Beyond that confirmation, our RTI obtained detailed payload specifications, swath widths, propellant mass, design life and power figures. Some questions remain unanswered. From the uncertainties we flagged to the answers ISRO provided read our full breakdown and the RTI reply: indianspaceflight.in/latest/… #ISRO #EOS05 #GISAT #GSLVF17 #EOS03

SAC has put out an EOI asking Indian industry to take over full assembly, integration and testing (AIT) of its electro-optical imaging payloads. That's the whole job, from receiving bare mirrors to handing over a calibrated, TVAC-tested camera at URSC. EOI no. SAC/EOI/03/D/2026-27, issued 30 Oct, responses due 30 Nov 2026 by 3 PM IST. It covers 14 payloads across 5 types. SAC doesn't name the missions, but the optics specs give away quite a lot: > Type-2, "Cartographic Imager" (4 units) 1.2 m Korsch telescope, ~16 m focal length, PAN/MX/MWIR/SWIR → Same 1.2 m optics class as Cartosat-3. A 16 m focal length works out neatly for its 0.25 m GSD from 509 km. > Type-3, High Resolution Imager (3 units) Two-mirror Ritchey-Chrétien, 600 mm primary, ~5.8 m focal length, PAN/MX + MWIR, LWIR and night-time light imaging, with an onboard blackbody for calibration → Basically the Cartosat-2 telescope layout (700 mm, 5.6 m). Closest published spec we could find is HRSAT (1 m PAN, 4 m MX, 20 m LWIR). > Type-1, Wide Swath High Resolution Imager (3 units) ~1.13 m mirror but only ~3.5 m focal length, nine butted detectors plus four MWIR chains, ~700 kg optics module (roughly what an entire Cartosat-2 satellite weighed) → Big, fast optics built for swath and signal, not Cartosat-style narrow-strip imaging. We couldn't match it to any announced ISRO mission. > Type-4, "Advanced Resource Monitoring Satellite" (2 units) Two TMA telescopes, fore and aft, ~2 m focal length, fixed pitch bias → The Cartosat-1 stereo layout (two TMAs, 1.945 m, +26/-5 deg), which Resourcesat-3S/3SA carries forward. > Type-5, "Advanced Resource Monitoring Satellite" (2 units) VNIR+SWIR side modules, a central TMA module and three hyperspectral heads → Lines up with Resourcesat-3/3A: ALISS-3 at 20 m on the sides and 10 m in the centre, plus ATCOR. The vendor's scope covers stress-free bonding of mirrors onto CFRP structures, interferometric telescope alignment, detector focusing, integrating the electronics, harness and thermal hardware, TVAC and vibration testing, and full calibration (MTF, SNR/NEDT, band-to-band registration, spectral, radiometric). Then delivery to URSC Bengaluru and support right through in-orbit testing. How it works: > Phase-1: training at SAC + building all the ground support equipment > Phase-2: first unit of each type built at SAC, vendor team under SAC supervision > Phase-3: remaining units at the vendor's own facility → At least ~16 months per payload, contract runs about five years. The entry bar is high: > Own ISRO-approved ISO 8 cleanroom, 30 m x 20 m per payload type, with an ISO 7 optical bay > TVAC chamber with an optical window (shroud -100 to +70 C, 10^-6 torr) > 1.5 m class collimator, reference flat, integrating sphere and blackbody > Prior AIT experience on an EO imager above 200 mm aperture > At least five years as a company, no consortiums > If flight hardware gets damaged during AIT or transport, the vendor pays This comes after SAC's 2025 EOIs for focal plane assemblies and MWIR detector-cooler assemblies. Bit by bit, the EO payload chain is moving to industry, while SAC keeps design authority and final acceptance. (Mission matches are our reading of the optics specs and published mission data. The EOI itself doesn't name any.) Archived: indianspaceflight.in/archive… Source: isro.gov.in/media_isro/pdf/T… #ISRO #Cartosat #Resourcesat #EarthObservation

⏰️ T-7 HOURS TO LAUNCH We are hours away from ISRO's GSLV-F18 mission which will carry the NVS-03 navigation satellite into GTO! 🚀 With India's entire satellite navigation constellation (NavIC), which is currently in a defunct state, betting on the success of this satellite to be able to come back to life, this mission is set to be a nailbiter! Check out our launch infographic below to learn more about this launch 👇

⏰ T-7 HOURS TO LAUNCH! We're just hours away from ISRO's GSLV-F18 mission, set to carry the NVS-03 navigation satellite to GTO! 🚀 With India's NavIC constellation currently facing a critical situation, the success of this mission could be key in restoring the PNT (Position, Navigation & Timing) capabilities. All eyes are on this launch! Check out our launch infographic below to learn more! Infographic by @Lokeshkr73

Photos from GSLV F17 launch

We’ve rolled out a massive update to indianspaceflight.in: Platform v3 🚀 More of you are using the platform on mobile, so we’ve optimised the UI for smaller screens. Desktop will still give you the best experience. What’s new: 🎨 Theme palette support, so you’re no longer limited to light and dark mode 🌑 Graphite Grey is the new default dark theme. The old dark theme stays as “ISF Retro”, so you can switch to whichever you like. ⚡ A smoother, faster platform overall 🧹 A simpler layout. We removed a few features that were rarely used, after feedback that v2 felt too cluttered. Enjoy, and do share your feedback!

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Thank you, @ispaceflight_in, for featuring VETRIYAAN MISSION and sharing our mission footage with the global space community. 🇮🇳🚀 This milestone marks an important step in Astreva Aerospace India’s journey towards advancing aerospace engineering and near-space exploration. We look forward to sharing more about the mission and our future initiatives. Onward to new frontiers. 🇮🇳🌍

VETRIYAAN MISSION | EDGE OF SPACE 🌍🚀 A perspective beyond the ordinary. A glimpse of Earth from the edge of space. Captured during VETRIYAAN MISSION, Astreva Aerospace India’s high-altitude balloon mission conducted on 10 October 2026 from Gandhigramam, Karur, Tamil Nadu, India. #VetriyaanMission #AstrevaAerospace #EdgeOfSpace #AerospaceEngineering #ScientificExploration #VetriyaanMission #astrevaaerospace #vetriyaan #vellore #highaltitude #spacestartup #startup #spacetech #earthhorizon #spacetechstartup #AstrevaAerospace #EdgeOfSpace

#ISRO: Three satellites are working. Four needed for a position fix. One launching on Friday. Inside #NavIC, the valve gamble, and the cyclone that crossed 340 km north: Read at @ispaceflight_in indianspaceflight.in/forum/p…

🚀FROM LIFTOFF TO THE EDGE OF SPACE — THE VETRIYAAN MISSION, UNFOLDED. Presenting the VETRIYAAN MISSION LAUNCH FILM by Astreva Aerospace India Pvt. Ltd. Witness the journey of our first mission from launch and high-altitude ascent to breathtaking edge-of-space visuals, descent, landing, and payload recovery. This film captures a defining milestone in ASTREVA’s journey towards indigenous aerospace innovation, scientific experimentation, and the development of future-ready aerospace capabilities. Every frame reflects our commitment to engineering, exploration, and pushing the boundaries of what an independent Indian aerospace startup can achieve. From the launchpad to the edge of space — this is only the beginning. ▶️ Watch the VETRIYAAN Mission journey. #ASTREVAAEROSPACE #VETRIYAAN #vetriyaanmission #vellore #spacestartup #80thindepedence #bharat #india #tamilnadu #highaltutudemission #ViksitBharat #ViksitBharat2047 #indiaspace #astreva #spacetech #astrevaaerospaceindia #startup #Aerospace #ScientificResearch #AerospaceInnovation #bharat #SpaceTechnology #NearSpace #HighAltitudeBalloon #IndianStartups #MakeInIndia

OFFICIAL MISSION RELEASE | VETRIYAAN MISSION Astreva Aerospace India Pvt. Ltd. is pleased to publish the official mission release detailing the successful completion of the VETRIYAAN MISSION, a significant milestone in our pursuit of indigenous aerospace innovation and scientific experimentation. As an independent Indian aerospace startup, We remains committed to advancing engineering capabilities, fostering scientific exploration, and developing technologies for future aerospace missions. This release outlines the mission overview, experimental objectives, key flight details, and scientific observations. Innovate. Miniaturize. Orbit. #ASTREVA #VETRIYAAN #vetriyaanmission #vellore #spacestartup #80thindepedence #bharat #india #tamilnadu #highaltutudemission #ViksitBharat #ViksitBharat2047 #indiaspace #astreva #spacetech #astrevaaerospaceindia #startup #Aerospace #ScientificResearch #AerospaceInnovation #bharat