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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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Identifier
21798, 1991-082A
Orbit
SSO
Last TLE update
18 hours ago
Origin
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)
1991-11-28 (34 years ago)
Launch vehicle
ATLAS E
Launch site
Air Force Western Test Range (AFWTR)
Object type
Payload
Rocket body
Debris
Shape & HBR
Cyl + 1 Pan, 2.5 m
Radar Cross Section
4.290 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 18 hours ago
0 DMSP 5D-2 F11 (USA 73)
1 21798U 91082A   25210.74233457  .00000084  00000-0  62973-4 0  9995
2 21798  98.7265 240.4509 0014011 115.5015 244.7611 14.17321793739456
Epoch: 2025-07-29T17:48Z
TLE epoch observation values (Epoch: 2025-07-29T17:48:57.706Z)
Latitude
-0.00002°
Longitude
25.57891°
Altitude
841.656 km
Speed
7.43 km/s
True Right ascension
16h 01m 48s
True Declination
0° 00' 00"
Sunlit
Object was in daylight at epoch
Visualization orbit readout
Latitude
-38.25415°
Longitude
-160.60049°
Altitude
851.581 km
Speed
7.424 km/s
Apparent Right ascension
07h 34m 26s
Apparent Declination
-69° 24' 08"
Sunlit
Object is in daylight
Visualization observer readout
Local Sidereal Time
01:20:07
Azimuth
153.488° SSE
Elevation
-38.133°
Doppler factor
1
Orbital elements
Apogee altitude
841.689 km
Perigee altitude
821.486 km
Semi-major axis
7,209.725 km
Eccentricity
0.0014
Inclination
98.7265°
RAAN
240.4509°
Arg. of periapsis
115.5015°
True anomaly
244.61598°
Mean anomaly
244.7611°
Eccentric anomaly
244.68853°
Mean motion
3.5454 °/min
Orbital period
101.54 mins
BSTAR
0.000062973
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