Soviet-French X-ray and gamma-ray astrophysics observatory carrying French, Danish and Bulgarian instruments, placed into a highly eccentric four-day orbit to study black holes, gamma-ray bursts and the galactic center; operated for nearly nine years.
- Outcome
- Success
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- 4.4 T
- Flight
- 12th
- of 12 Proton-K/D-1 flights
- Date and time
- 1 December 1989, 20:20 UTC
- Rocket
- Proton-K/D-1
- Builder
- Khrunichev
- Launch site
- 200/40, Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Astrophysics
- International designator
- 1989-096
- Launches in 1989
- 97th of 102
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