Showing default

USA 74, 21799

Orbit data source: Space-Track

USA 74, 21799 is an American payload satellite in LEO that was launched on Fri, 08 Nov 1991 UTC via a TITAN 403A 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/21799?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/21799?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

21799, 1991-076C

Orbit

LEO

Last TLE update

22 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)

1991-11-08 (34 years ago)

Launch vehicle

TITAN 403A

Launch site

Air Force Western Test Range (AFWTR)

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 22 hours ago

0 USA 74
1 21799U 91076C   25184.88889687  .00006036  00000-0  50015-3 0  9992
2 21799  63.3009 357.8340 0891431  66.5557 302.6600 13.56607070 56262

Epoch: 2025-07-03T21:20Z

TLE epoch observation values (Epoch: 2025-07-03T21:20:00.689Z)

Latitude

-0.00003°

Longitude

115.68194°

Altitude

737.393 km

Speed

7.643 km/s

True Right ascension

23h 51m 20s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

62.95036°

Longitude

-145.07103°

Altitude

464.417 km

Speed

7.941 km/s

Apparent Right ascension

19h 25m 52s

Apparent Declination

47° 46' 27"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

06:49:27

Azimuth

353.893° N

Elevation

-1.937°

Doppler factor

Orbital elements

Apogee altitude

1,708.758 km

Perigee altitude

384.982 km

Semi-major axis

7,425.007 km

Eccentricity

0.08914

Inclination

63.3009°

RAAN

357.834°

Arg. of periapsis

66.5557°

True anomaly

Unknown

Mean anomaly

302.66°

Eccentric anomaly

Unknown

Mean motion

3.39233 °/min

Orbital period

106.12 mins

BSTAR

0.00050015

Loading maneuver chart data...

Loading SW <> Apogee altitude chart data...

Loading historical data...

Other satellites on launch #76 in the year 1991 (1991-11-08 UTC)

USA 74 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.
7 mins	2025-07-04 20:48:46.713Z	0.648° NNE	2025-07-04 20:51:46.713Z	49.786° ENE	20.092°	2025-07-04 20:55:46.713Z	98.799° ESE
8 mins	2025-07-04 22:38:46.713Z	299.034° NW	2025-07-04 22:40:46.713Z	252.169° W	36.673°	2025-07-04 22:46:46.713Z	167.067° S

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 USA 74, 21799 on other resources

View USA 74, 21799 on NASA - NSSDCA Website

View USA 74, 21799 on Heavens-Above

View USA 74, 21799 on Keep Track

View USA 74, 21799 on Celestrak

View USA 74, 21799 on Gunter's Space Page

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