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: 12 hours ago
TLE from 12 hours ago
0 DMSP 5D-2 F11 (USA 73)
1 21798U 91082A 26208.58223910 .00000082 00000-0 61655-4 0 9992
2 21798 98.6898 235.9591 0013034 150.5546 209.6366 14.17456962790854Epoch: 2026-07-27T13:58Z
TLE epoch observation values (Epoch: 2026-07-27T13:58:25.458Z)
Latitude
0.00001°
Longitude
81.08928°
Altitude
845.053 km
Speed
7.426 km/s
True Right ascension
15h 43m 50s
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
15:13:53
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
840.524 km
Perigee altitude
821.73 km
Semi-major axis
7,209.264 km
Eccentricity
0.0013
Inclination
98.6898°
RAAN
235.9591°
Arg. of periapsis
150.5546°
True anomaly
209.56285°
Mean anomaly
209.6366°
Eccentric anomaly
209.59971°
Mean motion
3.54574 °/min
Orbital period
101.53 mins
BSTAR
0.000061655
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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. |
|---|---|---|---|---|---|---|---|
| 10 mins | 2026-07-28 01:56:21.621Z | 170.477° S | 2026-07-28 02:01:21.621Z | 269.079° W | 44.359° | 2026-07-28 02:06:21.621Z | 343.494° N |
| 8 mins | 2026-07-28 14:17:21.621Z | 31.828° NE | 2026-07-28 14:21:21.621Z | 105.392° ESE | 35.883° | 2026-07-28 14:25:21.621Z | 168.805° S |
| 6 mins | 2026-07-28 15:58:21.621Z | 335.207° NNW | 2026-07-28 16:01:21.621Z | 293.338° NW | 20.974° | 2026-07-28 16:04:21.621Z | 253.419° W |
| 9 mins | 2026-07-29 01:40:21.621Z | 157.086° SSE | 2026-07-29 01:44:21.621Z | 97.285° ESE | 43.862° | 2026-07-29 01:49:21.621Z | 350.657° N |
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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