Deployed a trio of satellites into medium Earth orbit: two Glonass navigation satellites (Kosmos 1987 and Kosmos 1988) and the Etalon-1 geodetic calibration sphere (Kosmos 1989), used to refine measurements of Earth's gravity field and orbital tracking accuracy.
- Outcome
- Success
- Orbit
- MEO
- Medium Earth orbit
- Payload to orbit
- 3.8 T
- Flight
- 29th
- of 110 Proton K/DM-2 flights
- Date and time
- 10 January 1989, 02:05 UTC
- Rocket
- Proton K/DM-2
- Builder
- Khrunichev
- Launch site
- 200/39 (200L), Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Navigation
- International designator
- 1989-001
- Launches in 1989
- 1st of 102
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