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OV1-4, 2121

Orbit data source: Space-Track

OV1-4, 2121 is a payload satellite owned by USAF OAR (US) in LEO that was launched on Wed, 30 Mar 1966 UTC via an ATLAS D 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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Identifier
2121, 1966-025A
Orbit
LEO
Last TLE update
1 day ago
Origin
Manufacturer
GD/Convair
Mission
Defense Science
Bus & Motor
OV1, Unknown motor
Mass
87 kg wet, 87 kg dry
Launch date (UTC)
1966-03-30 (59 years ago)
Launch vehicle
ATLAS D
Launch site
Air Force Western Test Range (AFWTR)
Object type
Payload
Rocket body
Debris
Shape & HBR
Domed Cyl, 1.4 m
Radar Cross Section
0.946 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 1 day ago
0 OV1-4
1  2121U 66025A   25108.54272464  .00000406  00000-0  11442-3 0  9990
2  2121 144.5042  29.1790 0083659 214.7416 144.7770 13.87251130992564
Epoch: 2025-04-18T13:01Z
Definitive object data (Epoch: 2025-04-18T13:01:31.408Z)
Latitude
0.00001°
Longitude
-13.10066°
Altitude
987.463 km
Speed
7.335 km/s
True Right ascension
01h 56m 42s
True Declination
0° 00' 00"
Sunlit
Object was in daylight at TLE epoch
Visualization TLE readout
Latitude
19.79582°
Longitude
-36.32824°
Altitude
997.303 km
Speed
7.326 km/s
Apparent Right ascension
21h 36m 43s
Apparent Declination
-13° 08' 39"
Sunlit
Object is in daylight
Visualization observer readout
Local Sidereal Time
04:53:49
Azimuth
271.983° WNW
Elevation
-23.107°
Doppler factor
1
Orbital elements
Apogee altitude
1,002.494 km
Perigee altitude
880.028 km
Semi-major axis
7,319.398 km
Eccentricity
0.0083659
Inclination
144.5042°
RAAN
29.179°
Arg. of periapsis
214.7416°
True anomaly
145.32522°
Mean anomaly
144.777°
Eccentric anomaly
145.05158°
Mean motion
3.46601 °/min
BSTAR
0.00011442
Orbital period
103.87 mins
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OV1-4 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.
8 mins2025-04-20 10:29:16.844Z107.195° ESE2025-04-20 10:33:16.844Z160.35° S23.592°2025-04-20 10:37:16.844Z208.336° SW
9 mins2025-04-20 12:07:16.844Z99.364° ESE2025-04-20 12:11:16.844Z162.587° S36.936°2025-04-20 12:16:16.844Z239.361° WSW
10 mins2025-04-20 13:45:16.844Z105.359° ESE2025-04-20 13:49:16.844Z163.114° S40.451°2025-04-20 13:55:16.844Z260.21° W
10 mins2025-04-20 15:23:16.844Z125.602° SE2025-04-20 15:28:16.844Z205.459° SW35.619°2025-04-20 15:33:16.844Z265.908° W
7 mins2025-04-20 17:03:16.844Z166.599° S2025-04-20 17:06:16.844Z205.447° SW22.244°2025-04-20 17:10:16.844Z253.363° W
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