CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
2018-0104
IRIDIUM 21
IRIDIUM 21 (NORAD 25778) re-entered Earth’s atmosphere on 24 May 2018, after 18 years, 11 months in orbit.
Official date
NORAD number
25778
International designator
1999-032B
Object type
Spacecraft
Country
United States
Launched
11 Jun 1999Taiyuan
Re-entered (UTC)
24 May 2018UTC calendar day
Time in orbit
18 years, 11 months6,922 days
How it ended
Re-entered (natural decay)
Latitude range
86.4°N to 86.4°SFinal inclination 86.4°
Mass
655 kg
Operator
Built by
Motorola
Bus
LM700
Programme
Iridium
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 86.4°, allowed a re-entry anywhere between 86.4°N and 86.4°S.
Life in orbit
18 years, 11 monthsIRIDIUM 21’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1999-032
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/2018-0104
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/2018-0104
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.