ISRO Shukrayaan-1 Venus Orbiter Launch

What this countdown tracks

Departure of Shukrayaan-1, India's first dedicated Venus orbiter. The spacecraft is expected to launch on an LVM-3 from Sriharikota and begin a roughly 112-day heliocentric cruise to Venus. Its brief is to probe the atmosphere, surface and plasma environment of the inner planet with a mix of Indian-built and international payloads.

Background

The Venus Orbiter Mission, branded Shukrayaan-1, was approved by the Union Cabinet in September 2024 with a budget of ₹1,236 crore and a nominal launch set for 29 March 2028. ISRO narrowed the opportunity using launch windows that minimise delta-v and cruise time; the March 2028 slot yields an arrival in July of the same year. The carrier is expected to be an LVM-3 — the first interplanetary use of India's heaviest operational launcher — with the possibility of a Super Heavy Lift Vehicle substitution depending on readiness. LVM-3 has flown only eight missions as of 2025, including the Chandrayaan-2 and Chandrayaan-3 launches and the OneWeb commercial deployments.

Payload candidates include a Venus Synthetic Aperture Radar (VSAR) for sub-cloud surface mapping, a Venus Thermal Camera, the VARTISS solar-X-ray spectrometer, a radio-occultation experiment, and an ionospheric electron-temperature analyser. International partners have contributed in earlier phases; a Swedish ion-composition analyser from the Swedish Institute of Space Physics and a French IR spectrometer from LATMOS have been publicly discussed, alongside German contributions on the Venus Ionospheric and Solar wind particle Analyser. Mission objectives include mapping surface topography below the sulfuric acid cloud deck, studying atmospheric dynamics and super-rotation that sees the upper atmosphere rotate 60 times faster than the solid planet, and characterising solar-wind interaction in the absence of a Venusian magnetic field. The orbiter targets a highly elliptical insertion around 500 × 60,000 km to balance close observation and long-duration coverage. The spacecraft bus draws on the Mangalyaan and Chandrayaan heritage with solar-array sizing adjusted for the 0.72 AU flux.

Why the date matters

29 March 2028 is governed by orbital mechanics — Earth–Venus launch windows recur only every 19 months due to the relative synodic period of the two planets, and missing this one would push Shukrayaan deep into 2029 or beyond. The date also falls in an interplanetary cadence where NASA's DAVINCI and VERITAS missions are preparing for their own Venus arrivals later in the decade, giving Indian data natural comparison points. A clean launch keeps India on schedule for a coordinated multi-mission Venus science era.

What to watch for

• Final LVM-3 configuration confirmation for the interplanetary trajectory, including CE-20 upper-stage restart performance.
• Trans-Venus injection burn and cruise telemetry during the first 48 hours.
• Deployment status of VSAR and thermal camera booms, a historical failure mode on deep-space missions.
• Payload commissioning milestones during the 112-day cruise phase.
• Participation of international instruments and data-sharing agreements with ESA, CNES, SNSA and DLR.
• Navigation updates from ISTRAC and Deep Space Network at Byalalu.
• Readiness for Venus Orbit Insertion scheduled for 19 July 2028.
• Fuel-margin reports following trans-Venus injection, which will govern any extended mission.
• Parallel preparation of backup launch windows in case of March slippage.

Who's affected

Shukrayaan-1 is the most expensive interplanetary mission India has funded to date at ₹1,236 crore, more than twice Mangalyaan's ₹450-crore budget. Roughly 200 scientists across Physical Research Laboratory Ahmedabad, Space Applications Centre Ahmedabad, URSC Bengaluru and partner universities are working on instruments or science analysis. International partners committed to co-investigator seats on specific payloads will gain priority data access under negotiated timelines. The mission is also a test bed for ISRO's Gaganyaan-era deep-space communications upgrades, including the 32-metre Byalalu antenna refit completed in 2024.

Related events to track

Launch pairs with Shukrayaan Venus orbit insertion 112 days later, and shares LVM-3 scheduling with Chandrayaan-4 and BAS-01 module launch.

FAQ

When exactly is the Shukrayaan-1 launch? ISRO's planning date is 29 March 2028, set by the Earth–Venus transfer window derived from the synodic cycle.

Is Shukrayaan-1 confirmed or expected? Confirmed through Cabinet approval in September 2024; specific launch date remains subject to vehicle readiness and payload integration schedule at Sriharikota.

Who is responsible for Shukrayaan-1? ISRO, with instruments and subsystems supplied by Indian labs and international partners including Swedish and French agencies; mission operations run from URSC and ISTRAC Bengaluru.

Where can I read the official announcement? isro.gov.in press releases, the PIB Cabinet note of September 2024, and the Wikipedia entry at en.wikipedia.org/wiki/Venus_Orbiter_Mission.