Key statistics
Satellite OSCAR 31 at a glance.
Uptime
13468
Days in orbit
Revolutions
≈ 13.4
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
90.0
Latest
Satellite identification and parameters
Extended collection of information and parameters for OSCAR 31.
Object identification
Identified? True
Debris? False
Object name: OSCAR 31
International designator: 1988-074B
Object number (NORAD): 19420
Object ID (CCSDS): 19420
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 107.258 minutes
Inclination: 90.0293 deg
SMA: 7477.911 km
Apoapsis: 1169.487 km
Periapsis: 1030.066 km
RAAN: 20.042 deg
Eccentricy: 0.0093222
Argument of periapsis: 326.5897 deg
Mean anomaly: 44.4594 deg
Mean motion: 13.42555657 rev/day
Mean motion (dot): 0.00000058 rev/day2
B* drag term: 0.000085052 1/REarth
Two-line elements (TLE)
Creation date: July 10, 2025, 3:09 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: July 9, 2025, 6:31 p.m. UTC
TLE line 0: 0 OSCAR 31
TLE line 1: 1 19420U 88074B 25190.77197731 .00000058 00000-0 85052-4 0 9999
TLE line 2: 2 19420 90.0293 20.0420 0093222 326.5897 44.4594 13.42555657805586
Live tracking on map
Real-time ground track for satellite OSCAR 31.
In-orbit conjunctions
There are no conjunctions computed for OSCAR 31, at the moment. Check back to stay up to date, as we update our databases every day.
Go to all conjunctionsAssociated space launch
The Transit-O series of satellites that closely followed the design of Transit 5C-1 were also called “Oscars” (Oscar is the phonetic alphabet for “O”, i. e., operational). They were also called NNS (Navy Navigation Satellite) or shortened NavSat.
OSCAR 31 was lifted into orbit during the mission ‘Scout G-1 | Transit-O 25,31’, on board a Scout G-1 space rocket.
The launch took place on Aug. 25, 1988, 6:59 a.m. from Space Launch Complex 5.
For more information about the launch, click the button.
Scout G-1 | Transit-O 25,31
Agency: N/A
Status: Launch Successful
Launch date: Aug. 25, 1988, 6:59 a.m. UTC
Rocket: Scout G-1
Launch pad: Space Launch Complex 5
Location: Vandenberg SFB, CA, USA
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Latest news about this satellite
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