IRS-1A

India's first operational remote sensing satellite, launched from Baikonur in March 1988; its LISS cameras imaged India for over eight years.

No longer operational, according to the public satellite catalogue.

What it did

IRS-1A was the first of India's own series of operational remote sensing satellites. It carried push-broom cameras called LISS-I and LISS-II. LISS-I saw details about 73 m across, and the two LISS-II cameras (2A and 2B) saw 36.25 m. Each pass covered a strip of ground about 140 km wide.

Spacecraft

IRS-1A weighed 975 kg and had 600 watts of power. It was three-axis stabilised with four reaction wheels and magnetic torquers, and had sixteen 1 N hydrazine thrusters. It sent data on S-band and X-band, with VHF used for commands only.

Launch and orbit

A Soviet Vostok rocket launched IRS-1A from Baikonur on 17 March 1988. It flew in a polar sun-synchronous orbit at about 904 km, crossing the equator at 10:30 a.m. local time on its southward pass. It returned over the same ground every 22 days, after 307 orbits.

Mission status

The mission ended in July 1996, after 8 years and 4 months of service.

Sources

  1. IRS-1A — satellite catalogue record (NORAD 18960) — CelesTrak
  2. IRS-1A — ISRO
  3. IRS 1A, 1B — Gunter's Space Page
  4. List of DoS/ISRO satellites launched so far (10 April 2025) — ISRO