TDRS 5, 21639
Orbit data source: Space-Track
TDRS 5, 21639 is a payload satellite owned by GSFC (US) in GEO that was launched on Fri, 02 Aug 1991 UTC via an SPACE SHUTTLE launch vehicle from the Air Force Eastern Test Range (AFETR). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.
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21639 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
TRW
Mission
Operational Civil Communications
Bus & Motor
TDRS, AOCS
Mass
2,534 kg wet, ~1,700 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Hex Cyl + 2 Pan, 8.9 m
Radar Cross Section
13.873 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 1 day ago
TLE from 1 day ago
0 TDRS 5
1 21639U 91054B 25346.24317225 .00000085 00000-0 00000-0 0 9999
2 21639 14.0942 355.1589 0013928 255.9382 110.0675 1.00267661125845Epoch: 2025-12-12T05:50Z
TLE epoch observation values (Epoch: 2025-12-12T05:50:10.082Z)
Latitude
1.50103°
Longitude
-167.60464°
Altitude
35,807.38 km
Speed
3.073 km/s
True Right ascension
00h 04m 29s
True Declination
1° 29' 58"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
05:23:55
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
35,847.459 km
Perigee altitude
35,729.999 km
Semi-major axis
42,166.866 km
Eccentricity
0.00139
Inclination
14.0942°
RAAN
355.1589°
Arg. of periapsis
255.9382°
True anomaly
110.21732°
Mean anomaly
110.0675°
Eccentric anomaly
110.14242°
Mean motion
0.25066 °/min
Orbital period
1,436.2 mins
BSTAR
0
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Other satellites on launch #54 in the year 1991 (1991-08-02 UTC)
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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.TDRS 5 Visibility forecast
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Span | Click to sort rows by Start time (UTC) header in descending order | Start Az. | Max El. time (UTC) | Max El. Az. | Max El. | End time (UTC) | End Az. |
|---|---|---|---|---|---|---|---|
| 666 mins | 2025-12-13 06:55:31.268Z | 256.346° W | 2025-12-13 11:52:31.268Z | 263.088° W | 20.553° | 2025-12-13 18:01:31.268Z | 249.948° W |
| 155 mins | 2025-12-14 04:20:31.268Z | 248.46° W | 2025-12-14 06:55:31.268Z | 256.554° W | 15.336° | 2025-12-14 06:55:31.268Z | 256.554° W |
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21639 neighbors
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Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in descending order |
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