DMSP 5D-2 F11 (USA 73), 21798
Orbit data source: Space-Track
DMSP 5D-2 F11 (USA 73), 21798 is a payload satellite owned by USAF SSD (US) in SSO that was launched on Thu, 28 Nov 1991 UTC via an ATLAS E launch vehicle from the Air Force Western Test Range (AFWTR). 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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21798 intel report (Beta)
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Identifier
Orbit
Country
USRelated business
Manufacturer
GE/East Windsor
Mission
Non-operational Defense Weather
Bus & Motor
BLOCK 5D, STAR 37S
Mass
1,456 kg wet, 749 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl + 1 Pan, 2.5 m
Radar Cross Section
4.290 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 9 hours ago
TLE from 9 hours ago
0 DMSP 5D-2 F11 (USA 73)
1 21798U 91082A 26121.47540612 .00000141 00000-0 90660-4 0 9999
2 21798 98.6940 150.7464 0013362 49.4668 310.7669 14.17438689778515Epoch: 2026-05-01T11:24Z
TLE epoch observation values (Epoch: 2026-05-01T11:24:35.088Z)
Latitude
-0°
Longitude
120.19307°
Altitude
830.653 km
Speed
7.441 km/s
True Right ascension
10h 02m 59s
True Declination
0° 00' 00"
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
04:04:35
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
840.822 km
Perigee altitude
821.556 km
Semi-major axis
7,209.326 km
Eccentricity
0.00134
Inclination
98.694°
RAAN
150.7464°
Arg. of periapsis
49.4668°
True anomaly
310.65081°
Mean anomaly
310.7669°
Eccentric anomaly
310.70887°
Mean motion
3.54569 °/min
Orbital period
101.53 mins
BSTAR
0.00009066
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Other satellites on launch #82 in the year 1991 (1991-11-28 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.DMSP 5D-2 F11 (USA 73) 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. |
|---|---|---|---|---|---|---|---|
| 8 mins | 2026-05-02 01:05:56.915Z | 127.16° SE | 2026-05-02 01:09:56.915Z | 67.519° E | 29.564° | 2026-05-02 01:13:56.915Z | 8.804° NNE |
| 7 mins | 2026-05-02 02:46:56.915Z | 213.781° SW | 2026-05-02 02:49:56.915Z | 257.45° W | 25.729° | 2026-05-02 02:53:56.915Z | 317.262° NNW |
| 4 mins | 2026-05-02 13:27:56.915Z | 75.013° E | 2026-05-02 13:28:56.915Z | 87.338° E | 14.365° | 2026-05-02 13:31:56.915Z | 122.307° SE |
| 9 mins | 2026-05-02 15:05:56.915Z | 5.478° NNE | 2026-05-02 15:09:56.915Z | 293.198° NW | 42.591° | 2026-05-02 15:14:56.915Z | 206.165° SW |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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