Showing default

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.

Loading next visibility...

Iframe embed code

<iframe src="https://www.satcat.com/sats-embedded/21798?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

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

Optional Secondary NORAD IDs

Max 10 NORAD IDs; Separated by commas

Initial load time (optional)

ISO8601 Format

TLE date request (optional)

ISO8601 Format

Identifier

21798, 1991-082A

Orbit

SSO

Last TLE update

17 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 17 hours ago

0 DMSP 5D-2 F11 (USA 73)
1 21798U 91082A   25199.02349500  .00000044  00000-0  43352-4 0  9995
2 21798  98.7268 228.9427 0013601 146.7924 213.4107 14.17318491738046

Epoch: 2025-07-18T00:33Z

TLE epoch observation values (Epoch: 2025-07-18T00:33:49.967Z)

Latitude

-0.00007°

Longitude

-75.59639°

Altitude

845.54 km

Speed

7.426 km/s

True Right ascension

15h 15m 46s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

36.33082°

Longitude

-81.34358°

Altitude

842.358 km

Speed

7.433 km/s

Apparent Right ascension

16h 30m 07s

Apparent Declination

1° 06' 46"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

06:27:25

Azimuth

40.459° NE

Elevation

-41.002°

Doppler factor

Orbital elements

Apogee altitude

841.405 km

Perigee altitude

821.793 km

Semi-major axis

7,209.736 km

Eccentricity

0.00136

Inclination

98.7268°

RAAN

228.9427°

Arg. of periapsis

146.7924°

True anomaly

213.325°

Mean anomaly

213.4107°

Eccentric anomaly

213.36784°

Mean motion

3.54539 °/min

Orbital period

101.54 mins

BSTAR

0.000043352

Loading maneuver chart data...

Loading SW <> Apogee altitude chart data...

Loading historical data...

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.
5 mins	2025-07-19 00:27:46.140Z	89.371° E	2025-07-19 00:30:46.140Z	54.622° ENE	13.903°	2025-07-19 00:32:46.140Z	31.986° NE
9 mins	2025-07-19 02:05:46.140Z	171.411° S	2025-07-19 02:09:46.140Z	225.334° WSW	44.119°	2025-07-19 02:14:46.140Z	342.984° N
8 mins	2025-07-19 14:26:46.140Z	35.879° NE	2025-07-19 14:29:46.140Z	91.842° ESE	35.838°	2025-07-19 14:34:46.140Z	171.553° S
6 mins	2025-07-19 16:07:46.140Z	328.797° NNW	2025-07-19 16:09:46.140Z	299.962° NW	20.932°	2025-07-19 16:13:46.140Z	248.391° W

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 ascending order

Authenticating...

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 ascending order

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.