Key statistics
Satellite OPS 4311 (DMSP 5B F1) at a glance.
Uptime
19729
Days in orbit
Revolutions
≈ 14.3
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
99.0
Latest
Satellite identification and parameters
Extended collection of information and parameters for OPS 4311 (DMSP 5B F1).
Object identification
Identified? True
Debris? False
Object name: OPS 4311 (DMSP 5B F1)
International designator: 1971-087A
Object number (NORAD): 5557
Object ID (CCSDS): 5557
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 100.815 minutes
Inclination: 99.0229 deg
SMA: 7175.359 km
Apoapsis: 832.785 km
Periapsis: 761.662 km
RAAN: 20.2301 deg
Eccentricy: 0.00495608
Argument of periapsis: 249.8614 deg
Mean anomaly: 109.723 deg
Mean motion: 14.28358879 rev/day
Mean motion (dot): 0.00000367 rev/day2
B* drag term: 0.00016384988 1/REarth
Two-line elements (TLE)
Creation date: Oct. 18, 2025, 2:17 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 17, 2025, 8:24 p.m. UTC
TLE line 0: 0 OPS 4311 (DMSP 5B F1)
TLE line 1: 1 05557U 71087A 25290.85062843 .00000367 00000-0 16385-3 0 9991
TLE line 2: 2 05557 99.0229 20.2301 0049561 249.8614 109.7230 14.28358879805844
Live tracking on map
Real-time ground track for satellite OPS 4311 (DMSP 5B F1).
In-orbit conjunctions
There are no conjunctions computed for OPS 4311 (DMSP 5B F1), at the moment. Check back to stay up to date, as we update our databases every day.
Go to all conjunctionsAssociated space launch
Military meteorological satellite
OPS 4311 (DMSP 5B F1) was lifted into orbit during the mission ‘Thor Burner 2A | DSAP-5B F1’, on board a Thor Burner 2A space rocket.
The launch took place on Oct. 14, 1971, 7:51 a.m. from Space Launch Complex 10W.
For more information about the launch, click the button.
Thor Burner 2A | DSAP-5B F1
Agency: N/A
Status: Launch Successful
Launch date: Oct. 14, 1971, 7:51 a.m. UTC
Rocket: Thor Burner 2A
Launch pad: Space Launch Complex 10W
Location: Vandenberg SFB, CA, USA
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Latest news about this satellite
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