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USA 61, 20691

Orbit data source: Space-Track

USA 61, 20691 is an American payload satellite in LEO that was launched on Fri, 08 Jun 1990 UTC via a TITAN 405A launch vehicle from the Air Force Eastern Test Range (AFETR). 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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<iframe src="https://www.satcat.com/sats-embedded/20691?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/20691?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

20691, 1990-050C

Orbit

LEO

Last TLE update

9 hours ago

Origin

National Reconnaissance Office (US)

Manufacturer

NRL

Mission

Defense Sigint

Bus & Motor

NOSS B SSU, Unknown motor

Mass

~400 kg wet, ~400 kg dry

Launch date (UTC)

1990-06-08 (35 years ago)

Launch vehicle

TITAN 405A

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 1 m

Radar Cross Section

1.178 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 9 hours ago

0 USA 61
1 20691U 90050C   25167.31835880  .00005578  00000-0  42381-3 0  9995
2 20691  63.2958 116.2397 0890354  78.1463 291.7917 13.59144284 56480

Epoch: 2025-06-16T07:38Z

TLE epoch observation values (Epoch: 2025-06-16T07:38:26.2Z)

Latitude

0.00002°

Longitude

96.79972°

Altitude

848.466 km

Speed

7.525 km/s

True Right ascension

07h 44m 57s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

-45.41835°

Longitude

65.31484°

Altitude

1,450.644 km

Speed

6.943 km/s

Apparent Right ascension

09h 40m 59s

Apparent Declination

-68° 45' 28"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

02:52:24

Azimuth

151.993° SSE

Elevation

-41.036°

Doppler factor

Orbital elements

Apogee altitude

1,697.889 km

Perigee altitude

377.359 km

Semi-major axis

7,415.761 km

Eccentricity

0.08904

Inclination

63.2958°

RAAN

116.2397°

Arg. of periapsis

78.1463°

True anomaly

Unknown

Mean anomaly

291.7917°

Eccentric anomaly

Unknown

Mean motion

3.39867 °/min

Orbital period

105.92 mins

BSTAR

0.00042381

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Other satellites on launch #50 in the year 1990 (1990-06-08 UTC)

USA 61 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	2025-06-16 21:54:08.725Z	178.09° S	2025-06-16 21:57:08.725Z	117.469° SE	26.709°	2025-06-16 21:59:08.725Z	66.774° ENE
8 mins	2025-06-17 07:07:08.725Z	327.965° NNW	2025-06-17 07:10:08.725Z	126.549° SE	44.259°	2025-06-17 07:15:08.725Z	145.849° SSE

Authenticating...

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Check out USA 61, 20691 on other resources

View USA 61, 20691 on NASA - NSSDCA Website

View USA 61, 20691 on Heavens-Above

View USA 61, 20691 on Keep Track

View USA 61, 20691 on Celestrak

View USA 61, 20691 on Gunter's Space Page

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