Soviet Space ProgramTsiklon-290, Baikonur Cosmodrome, Republic of Kazakhstan
US-P 21
Launched
April 18, 1985
Image: Ukrainian Space Agency
Summary
US-P 21 launched on a Soviet Space Program Tsiklon-2 from 90, Baikonur Cosmodrome, Republic of Kazakhstan on April 18, 1985. It was Soviet Space Program's 1,880th launch, 24th this year and humanity's 2,935th orbital launch attempt. It was the 67th Tsiklon-2 flight and the 2nd this year. The payload was bound for low Earth orbit (LEO). Kosmos-1646, one of 25 catalogued objects, reached a 432 × 450 km orbit inclined 65.1°. 25 objects from this launch are catalogued, one of them a payload.
- Watch
- No webcast on record.
- Vehicle
- Tsiklon-2 · Soviet Space Program
- Booster
- No booster details on record.
- Mission
- Government/Top Secret · Low Earth Orbit (LEO)
- Milestone
- 67th Tsiklon-2 flight · 2nd this yearSoviet Space Program's 1,880th launch24th this yearhumanity's 2,935th orbital launch attempt31st orbital launch attempt this year
Flight preview
Orbit: as tracked
Kosmos-1646 · NORAD 15653 · 1985-030 · Space-Track · tracking 1 of 25 objects
Show the numbers for orbit elements
- Object
- COSMOS 1646
- Object ID
- 1985-030A
- Epoch
- 1985-04-19 00:35:07 UTC
- Mean motion
- 15.44142172 rev/day
- Eccentricity
- 0.0013483
- Inclination
- 65.0549°
- Ascending node
- 206.7157°
- Arg. of perigee
- 297.6782°
- Mean anomaly
- 62.2978°
- Element set
- 999
- Rev at epoch
- 2
- B*
- 0
Perigee, apogee and period are Kepler figures from the catalogued mean elements, not a propagated state. Published orbit: LEO. Ascent drawn from padside's representative profile.
Catalogued objects
25 catalogued: 1 payload, 1 rocket stage, 23 debris; none still in orbit
- Kosmos-1646 · NORAD 15653 · broke up November 20, 1987
Tsiklon-2 99-801 Stage 2 · re-entered April 19, 1985
Data from J. McDowell, planet4589.org
About this launch
Ocean surveillance satellite using passive ELINT devices
Pad
90, Baikonur Cosmodrome, Republic of Kazakhstan
49th launch from 90, 2nd this year · 738th from Baikonur Cosmodrome, Republic of Kazakhstan
74 launches from this pad · 1,565 from Baikonur Cosmodrome, Republic of Kazakhstan
85 days after the previous launch from this pad
All launches from Baikonur Cosmodrome, Republic of KazakhstanOpen in maps
Questions
When did US-P 21 launch?
US-P 21 launched on April 18, 1985. The time is known to the hour, not the minute.
Where can I watch US-P 21?
No webcast is on record for this launch.
What rocket launched US-P 21?
Tsiklon-2, flown by Soviet Space Program. Tsiklon-2 spec sheet
Where did US-P 21 launch from?
90, Baikonur Cosmodrome, Republic of Kazakhstan.
What orbit did US-P 21 reach?
Kosmos-1646, one of 25 catalogued objects, reached a 432 × 450 km orbit inclined 65.1°.
How many satellites did US-P 21 launch?
1 payload from this launch is catalogued, no longer in orbit (Data from J. McDowell, planet4589.org).