CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1989-0824
PION 4
PION 4 (NORAD 20161) re-entered Earth’s atmosphere on 19 September 1989, after 2 months in orbit.
Official date
NORAD number
20161
International designator
1989-055D
Object type
Spacecraft
Country
USSR
Launched
18 Jul 1989Plesetsk Cosmodrome
Re-entered (UTC)
19 Sep 1989UTC calendar day
Time in orbit
2 months63 days
How it ended
Re-entered (natural decay)
Latitude range
82.6°N to 82.6°SFinal inclination 82.6°
Mass
78 kg
Operator
KAI / MOM
Built by
KAI
Bus
Pion
Programme
Pion
Where it came down
Latitude band its orbit allowedExact position not recorded
No position was recorded for this re-entry. Its final orbit, inclined at 82.6°, allowed a re-entry anywhere between 82.6°N and 82.6°S.
Life in orbit
2 monthsPION 4’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 19 Sep 1989
4 entriesFrom the same launch
1989-055
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1989-0824
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1989-0824
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.