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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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: 20 hours ago
TLE from 20 hours ago
0 OV1-4
1 02121U 66025A 26042.04675898 .00000338 00000-0 58565-4 0 9993
2 02121 144.5056 89.6170 0083200 185.5822 174.3921 13.87307991 33616Epoch: 2026-02-11T01:07Z
TLE epoch observation values (Epoch: 2026-02-11T01:07:19.975Z)
Latitude
-0.00002°
Longitude
-68.33469°
Altitude
997.674 km
Speed
7.324 km/s
True Right ascension
05h 58m 28s
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
23:24:33
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,001.957 km
Perigee altitude
880.166 km
Semi-major axis
7,319.198 km
Eccentricity
0.00832
Inclination
144.5056°
RAAN
89.617°
Arg. of periapsis
185.5822°
True anomaly
174.48431°
Mean anomaly
174.3921°
Eccentric anomaly
174.4383°
Mean motion
3.46615 °/min
Orbital period
103.86 mins
BSTAR
0.000058565
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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. |
|---|---|---|---|---|---|---|---|
| 11 mins | 2026-02-11 22:10:18.298Z | 105.182° ESE | 2026-02-11 22:15:18.298Z | 161.51° S | 39.667° | 2026-02-11 22:21:18.298Z | 262.34° W |
| 9 mins | 2026-02-11 23:50:18.298Z | 135.967° SSE | 2026-02-11 23:54:18.298Z | 201.986° SSW | 33.271° | 2026-02-11 23:59:18.298Z | 265.195° W |
| 6 mins | 2026-02-12 01:30:18.298Z | 179.623° S | 2026-02-12 01:32:18.298Z | 204.301° SW | 18.697° | 2026-02-12 01:36:18.298Z | 250.144° W |
| 7 mins | 2026-02-12 19:07:18.298Z | 110.545° ESE | 2026-02-12 19:10:18.298Z | 153.999° SSE | 25.507° | 2026-02-12 19:14:18.298Z | 209.734° SW |
| 8 mins | 2026-02-12 20:45:18.298Z | 102.235° ESE | 2026-02-12 20:49:18.298Z | 183.685° SSW | 37.525° | 2026-02-12 20:53:18.298Z | 241.3° WSW |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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