Key statistics
Satellite IUS R/B(2) at a glance.
Uptime
12553
Days in orbit
Revolutions
≈ 1.0
Per day
Orbit
OTHER
Other
Inclination
14.0
Latest
Satellite identification and parameters
Extended collection of information and parameters for IUS R/B(2).
Object identification
Identified? True
Debris? False
Object name: IUS R/B(2)
International designator: 1991-054D
Object number (NORAD): 21641
Object ID (CCSDS): 21641
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 1434.406 minutes
Inclination: 13.9578 deg
SMA: 42131.623 km
Apoapsis: 35907.176 km
Periapsis: 35599.8 km
RAAN: 334.4697 deg
Eccentricy: 0.00364781
Argument of periapsis: 340.6739 deg
Mean anomaly: 197.0239 deg
Mean motion: 1.00390007 rev/day
Mean motion (dot): -0.00000086 rev/day2
B* drag term: 0.0 1/REarth
Two-line elements (TLE)
Creation date: Dec. 14, 2025, 3:07 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 13, 2025, 12:03 p.m. UTC
TLE line 0: 0 IUS R/B(2)
TLE line 1: 1 21641U 91054D 25347.50262110 -.00000086 00000-0 00000-0 0 9996
TLE line 2: 2 21641 13.9578 334.4697 0036478 340.6739 197.0239 1.00390007 45500
Live tracking on map
Real-time ground track for satellite IUS R/B(2).
Associated space launch
STS-43 was the ninth flight of the Space Shuttle Atlantis. The nine day mission had a primary goal of launching the fifth Tracking and Data Relay Satellite, TDRS-E.
IUS R/B(2) was lifted into orbit during the mission ‘Space Shuttle Atlantis / OV-104 | STS-43’, on board a Space Shuttle space rocket.
The launch took place on Aug. 2, 1991, 3:02 p.m. from Launch Complex 39A.
For more information about the launch, click the button.
Space Shuttle Atlantis / OV-104 | STS-43
Agency: N/A
Status: Launch Successful
Launch date: Aug. 2, 1991, 3:02 p.m. UTC
Rocket: Space Shuttle
Launch pad: Launch Complex 39A
Location: Kennedy Space Center, FL, USA
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