Launch data:
| Designation | 12491 / 81051A |
| Launch date | 31 May 1981 - 05:00 UT |
| Launch site | Sriharikota |
| Launch vehicle | SLV-3 (#D3) |
| Mission | Scientific, Experimental |
| Earth orbit: | |
| Perigee / Apogee | 186 x 418 km (296/834 km was the intended orbit) |
| Eccentricity | |
| Inclination | 46 deg |
| Period | 90.6 min |
