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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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https://www.satcat.com/sats-embedded/21798?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21798, 1991-082A

Orbit

SSO

Last TLE update

18 hours ago

Origin

United States Air Force (US)

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

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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Other satellites on launch #82 in the year 1991 (1991-11-28 UTC)

DMSP 5D-2 F11 DEB, 28313 (Decayed)

DMSP 5D-2 F11 DEB, 28314 (Decayed)

DMSP 5D-2 F11 DEB, 28315

DMSP 5D-2 F11 DEB, 28316 (Decayed)

DMSP 5D-2 F11 DEB, 28317

DMSP 5D-2 F11 DEB, 28318 (Decayed)

DMSP 5D-2 F11 DEB, 28319

DMSP 5D-2 F11 DEB, 28320 (Decayed)

DMSP 5D-2 F11 DEB, 28321

DMSP 5D-2 F11 DEB, 28322

DMSP 5D-2 F11 DEB, 28323 (Decayed)

DMSP 5D-2 F11 DEB, 28324 (Decayed)

DMSP 5D-2 F11 DEB, 28325

DMSP 5D-2 F11 DEB, 28326

DMSP 5D-2 F11 (USA 73) Visibility forecast

Observer location: undefined°, undefined°

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	2025-07-30 14:43:07.294Z	18.622° NNE	2025-07-30 14:48:07.294Z	86.565° E	42.998°	2025-07-30 14:53:07.294Z	185.272° SSW
5 mins	2025-07-30 16:26:07.294Z	323.325° NNW	2025-07-30 16:28:07.294Z	298.396° NW	15.254°	2025-07-30 16:31:07.294Z	263.725° W
8 mins	2025-07-31 02:08:07.294Z	174.282° S	2025-07-31 02:12:07.294Z	295.637° NW	43.376°	2025-07-31 02:16:07.294Z	341.565° 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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Authenticating...

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Check out DMSP 5D-2 F11 (USA 73), 21798 on other resources

View DMSP 5D-2 F11 (USA 73), 21798 on NASA - NSSDCA Website

View DMSP 5D-2 F11 (USA 73), 21798 on Heavens-Above

View DMSP 5D-2 F11 (USA 73), 21798 on Keep Track

View DMSP 5D-2 F11 (USA 73), 21798 on Celestrak

View DMSP 5D-2 F11 (USA 73), 21798 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.