AstroSat is the first dedicated Indian astronomy mission aimed at studying celestial sources in X-ray, optical and UV spectral bands simultaneously. The payloads cover the energy bands of Ultraviolet (Near and Far), limited optical and X-ray regime (0.3 keV to 100keV). One of the unique features of AstroSat mission is that it enables the simultaneous multi-wavelength observations of various astronomical objects with a single satellite.

AstroSat with a lift-off mass of 1515 kg was launched on September 28, 2015 into a 650 km orbit inclined at an angle of 6 deg to the equator by PSLV-C30 from Satish Dhawan Space Centre, Sriharikota. The minimum useful life of the AstroSat mission is expected to be 5 years.

After injection into Orbit, the two solar panels of AstroSat were automatically deployed in quick succession. The spacecraft control centre at Mission Operations Complex (MOX) of ISRO Telemetry, Tracking and Command Network (ISTRAC), Bengaluru manages the satellite during its entire mission life.

The science data gathered by five payloads of AstroSat are telemetered to the ground station at MOX. The data is then processed, archived and distributed by Indian Space Science Data Centre (ISSDC) located at Bylalu, near Bengaluru.

The scientific objectives of AstroSat mission are:

o   To understand high energy processes in binary star systems containing neutron stars and black holes;

o   Estimate magnetic fields of neutron stars;

o  Study star birth regions and high energy processes in star systems lying beyond our galaxy;

o  Detect new briefly bright X-ray sources in the sky;

o  Perform a limited deep field survey of the Universe in the Ultraviolet region.

At present, all the payloads are operational and are observing the cosmic sources. The spacecraft and payloads are healthy. The first six months was dedicated for performance verification and calibration of payloads .After that, the science observations by the payloads began.

Preliminary results

AstroSat updates
Story of the week related to AstroSat

A review article on "ASTROSAT -- Indian Multiwavelength Astronomy Satellite to View the Invisible Universe" by Prof. P.C.Agrawal has been published in Physics News, July -- December 2016 issue. Freely downloadable version of this article is available at :Click here


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Fourth AO Cycle

Third AO Cycle

Second AO Cycle

AstroSat Announcement of Opportunity (AO)
Invitation for AstroSat Announcement of Opportunity (AO)


ISRO, in collaboration with the Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune has set up an AstroSat Support Cell (ASC) to facilitate the proposal making process and the use of AstroSat data. For more details,Visit

India's AstroSat discovers one of the earliest galaxies in extreme-Ultraviolet light and marks a major breakthrough


Launch Vehicle

Launch Vehicle

India’s Polar Satellite Launch Vehicle, in its thirty first flight (PSLV-C30) launched 1515 kg AstroSat into a 650 km orbit of 6 deg inclination to the equator. PSLV-C30 was launched from First Launch Pad (FLP) of Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota on 28th September 2015. 

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The objectives of the AstroSat mission are to design, develop, realize and launch a multi-wavelength astronomy satellite for studying the cosmic sources simultaneously over a wide range of the electromagnetic spectrum i.e from optical, ultraviolet (UV) to high energy X-rays.  

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Ground Segment

Ground Segment

ISRO Telemetry Tracking and Command Network (ISTRAC) is bestowed with the responsibility of providing the ground support for all the phases of this mission. AstroSat Ground Segment comprises TTC (Telemetry and Telecommand) and Payload Data reception stations, Satellite Control Centre (SCC), Indian Space Science Data Centre (ISSDC) and Payload Operations Centers (POCs).

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AstroSat is the first dedicated Indian astronomy mission aimed at studying celestial sources in X-ray, optical and UV spectral bands simultaneously. The payloads cover the energy bands of Ultraviolet (NUV and FUV), limited optical and X-ray regime (0.3 keV to 100keV)

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Large Area X-Ray Proportional Counter (LAXPC)Comprising three identical proportional counters of effective area > 8000 cm2 @ 5-30 keV. This payload is non-imaging. Its main purpose is to record variation of total intensity of sources within its 1-degree field of view, with high time resolution and moderate spectral resolution over a large spectral band from 3 to 80 keV.
Soft X-ray Telescope (SXT)Is a focusing X-ray telescope with an X-ray CCD imaging camera. This will work primarily in photon counting mode, recording the position, time and energy of every detected photon in the energy range 0.3-8 keV.
Machine Control Center To image the sky simultaneously in three wavelengths, one covering the far UV band (130 – 180 nm) and the second sensitive in near UV (200 – 300nm) and Visible (320 – 550 nm) bands. The detector in each channel is a photon counting device. Multiple choices of filters are available in each channel.
Cadmium Zinc Telluride Imager (CZTI)Is a hard X-ray coded mask camera working in the band 10-100 keV. It has better spectral resolution than the LAXPC and a coarse imaging capability by the coded mask.
Scanning Sky Monitor (SSM) For detection of new X-ray transients and monitoring of known X-ray sources in 2.5 – 10 keV region. In addition, there is a Charged Particle Monitor (CPM) to detect high-energy particles during the satellite orbital path and alert the instrumentation.