Showing default

USA 121, 23908

Orbit data source: Space-Track

USA 121, 23908 is an American payload satellite in LEO that was launched on Sun, 12 May 1996 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/23908?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/23908?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

23908, 1996-029C

Orbit

LEO

Last TLE update

1 day 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)

1996-05-12 (29 years ago)

Launch vehicle

TITAN 403A

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 0.5 m

Radar Cross Section

1.178 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 1 day ago

0 USA 121
1 23908U 96029C   25196.78897718  .00000639  00000-0  14173-3 0  9993
2 23908  63.3261 350.7447 0834223  44.3794 322.1084 13.44981460 58102

Epoch: 2025-07-15T18:56Z

TLE epoch observation values (Epoch: 2025-07-15T18:56:07.628Z)

Latitude

-0.00002°

Longitude

132.83445°

Altitude

622.452 km

Speed

7.782 km/s

True Right ascension

23h 22m 58s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow at epoch

Visualization orbit readout

Latitude

15.12476°

Longitude

-57.53193°

Altitude

1,348.606 km

Speed

7.061 km/s

Apparent Right ascension

13h 25m 37s

Apparent Declination

-20° 31' 56"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

07:30:54

Azimuth

106.811° ESE

Elevation

-12.034°

Doppler factor

Orbital elements

Apogee altitude

1,712.583 km

Perigee altitude

466.63 km

Semi-major axis

7,467.744 km

Eccentricity

0.08342

Inclination

63.3261°

RAAN

350.7447°

Arg. of periapsis

44.3794°

True anomaly

Unknown

Mean anomaly

322.1084°

Eccentric anomaly

Unknown

Mean motion

3.36325 °/min

Orbital period

107.04 mins

BSTAR

0.00014173

Loading maneuver chart data...

Loading SW <> Apogee altitude chart data...

Loading historical data...

Other satellites on launch #29 in the year 1996 (1996-05-12 UTC)

USA 119-124 DEB, 23863 (Decayed)

USA 119-124 DEB, 23938

USA 119-124 DEB, 23939

USA 119-124 DEB, 25609

USA 119-124 DEB, 25610

USA 119-124 DEB, 26637 (Decayed)

USA 119-124 DEB, 28251

USA 123 DEB, 31703

USA 119 DEB, 31704

USA 121 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.
13 mins	2025-07-16 20:23:56.589Z	332.587° NNW	2025-07-16 20:28:56.589Z	31.73° NE	41.619°	2025-07-16 20:36:56.589Z	135.967° SSE
10 mins	2025-07-16 22:15:56.589Z	288.801° WNW	2025-07-16 22:19:56.589Z	243.6° WSW	22.958°	2025-07-16 22:25:56.589Z	195.095° SSW
5 mins	2025-07-17 12:08:56.589Z	226.484° WSW	2025-07-17 12:10:56.589Z	0.95° NNE	40.912°	2025-07-17 12:13:56.589Z	30.216° NE

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 USA 121, 23908 on other resources

View USA 121, 23908 on NASA - NSSDCA Website

View USA 121, 23908 on Heavens-Above

View USA 121, 23908 on Keep Track

View USA 121, 23908 on Celestrak

View USA 121, 23908 on Gunter's Space Page

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