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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2121 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
GD/Convair
Mission
Spacecraft
Bus & Motor
OV1, Unknown motor
Mass
87 kg wet, 87 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Medium (>0.1 m² and <1 m²)
Expand to show TLE details & historyLast TLE update: 13 hours ago
TLE from 13 hours ago
0 OV1-4
1 02121U 66025A 25347.30399155 .00000384 00000-0 94013-4 0 9997
2 02121 144.5015 149.3048 0082756 118.8251 242.0760 13.87294933 25312Epoch: 2025-12-13T07:17Z
TLE epoch observation values (Epoch: 2025-12-13T07:17:44.869Z)
Latitude
-0.00003°
Longitude
-42.36529°
Altitude
965.885 km
Speed
7.356 km/s
True Right ascension
09h 57m 13s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
19:15:45
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,001.678 km
Perigee altitude
880.536 km
Semi-major axis
7,319.244 km
Eccentricity
0.00828
Inclination
144.5015°
RAAN
149.3048°
Arg. of periapsis
118.8251°
True anomaly
241.24217°
Mean anomaly
242.076°
Eccentric anomaly
241.65868°
Mean motion
3.46612 °/min
Orbital period
103.86 mins
BSTAR
0.000094013
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Other satellites on launch #25 in the year 1966 (1966-03-30 UTC)
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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.OV1-4 Visibility forecast
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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 mins | 2025-12-14 02:49:05.065Z | 105.457° ESE | 2025-12-14 02:53:05.065Z | 163.695° S | 25.031° | 2025-12-14 02:57:05.065Z | 214.439° SW |
| 9 mins | 2025-12-14 04:27:05.065Z | 98.85° ESE | 2025-12-14 04:31:05.065Z | 162.711° S | 37.368° | 2025-12-14 04:36:05.065Z | 244.004° WSW |
| 8 mins | 2025-12-14 06:06:05.065Z | 111.638° ESE | 2025-12-14 06:10:05.065Z | 204.279° SW | 39.227° | 2025-12-14 06:14:05.065Z | 259.35° W |
| 8 mins | 2025-12-14 07:44:05.065Z | 134.217° SE | 2025-12-14 07:48:05.065Z | 198.534° SSW | 32.527° | 2025-12-14 07:52:05.065Z | 259.87° W |
| 6 mins | 2025-12-14 09:24:05.065Z | 176.602° S | 2025-12-14 09:26:05.065Z | 201.113° SSW | 17.634° | 2025-12-14 09:30:05.065Z | 248.979° W |
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 descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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