CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
2018-0052
ORS 1 (USA 231)
ORS 1 (USA 231) (NORAD 37728) re-entered Earth’s atmosphere on 12 March 2018, after 6 years, 8 months in orbit.
Official date
NORAD number
37728
International designator
2011-029A
Object type
Spacecraft
Country
United States
Launched
30 Jun 2011Wallops
Re-entered (UTC)
12 Mar 2018UTC calendar day
Time in orbit
6 years, 8 months2,447 days
How it ended
Re-entered (natural decay)
Latitude range
—
Mass
475 kg
Operator
DoD ORS
Built by
ATK Space
Bus
ATK-A200
Programme
ORS
Where it came down
Not on recordNo position was recorded for this re-entry. Its final orbit is not on record.
Life in orbit
6 years, 8 monthsORS 1 (USA 231)’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 12 Mar 2018
2 entriesFrom the same launch
2011-029
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/2018-0052
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/2018-0052
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.