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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
18 hours 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 18 hours ago
0 OV1-4
1 02121U 66025A   25181.82024523  .00000274  00000-0  32882-5 0  9999
2 02121 144.5067  37.4982 0083050  17.0585 343.2874 13.87264367  2325
Epoch: 2025-06-30T19:41Z
TLE epoch observation values (Epoch: 2025-06-30T19:41:09.187Z)
Latitude
-0.00002°
Longitude
-176.91462°
Altitude
879.113 km
Speed
7.444 km/s
True Right ascension
02h 29m 59s
True Declination
0° 00' 00"
Sunlit
Object was in daylight at epoch
Visualization orbit readout
Latitude
-6.82056°
Longitude
-2.70943°
Altitude
998.052 km
Speed
7.324 km/s
Apparent Right ascension
13h 52m 45s
Apparent Declination
-22° 04' 11"
Sunlit
Object is in daylight
Visualization observer readout
Local Sidereal Time
01:31:44
Azimuth
344.394° N
Elevation
-71.603°
Doppler factor
1
Orbital elements
Apogee altitude
1,002.002 km
Perigee altitude
880.428 km
Semi-major axis
7,319.352 km
Eccentricity
0.00831
Inclination
144.5067°
RAAN
37.4982°
Arg. of periapsis
17.0585°
True anomaly
Unknown
Mean anomaly
343.2874°
Eccentric anomaly
Unknown
Mean motion
3.46605 °/min
Orbital period
103.86 mins
BSTAR
0.0000032882
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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.
5 mins2025-07-02 05:06:43.292Z120.655° SE2025-07-02 05:09:43.292Z153.746° SSE14.018°2025-07-02 05:11:43.292Z175.501° S
8 mins2025-07-02 06:44:43.292Z108.535° ESE2025-07-02 06:47:43.292Z155.457° SSE29.24°2025-07-02 06:52:43.292Z222.647° SW
9 mins2025-07-02 08:22:43.292Z102.605° ESE2025-07-02 08:26:43.292Z189.001° SSW38.676°2025-07-02 08:31:43.292Z249.898° W
9 mins2025-07-02 10:00:43.292Z113.693° SE2025-07-02 10:04:43.292Z189.962° SSW39.254°2025-07-02 10:09:43.292Z262.952° W
8 mins2025-07-02 11:39:43.292Z144.429° SSE2025-07-02 11:42:43.292Z191.026° SSW29.309°2025-07-02 11:47:43.292Z262.467° W
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