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OPS 3674 (VELA 4), 837

Orbit data source: Space-Track

OPS 3674 (VELA 4), 837 is a payload satellite owned by USAF SSD (US) in HEO that was launched on Fri, 17 Jul 1964 UTC via an ATLAS AGENA D launch vehicle from the Air Force Eastern Test Range (AFETR). 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
837, 1964-040B
Orbit
HEO
Last TLE update
2 weeks ago
Origin
Manufacturer
TRW
Mission
Defense Early Warn
Bus & Motor
VELA, BE-3
Mass
~217 kg wet, 125 kg dry
Launch date (UTC)
1964-07-17 (61 years ago)
Launch vehicle
ATLAS AGENA D
Launch site
Air Force Eastern Test Range (AFETR)
Object type
Payload
Rocket body
Debris
Shape & HBR
Poly, 1.4 m
Radar Cross Section
2.240 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 2 weeks ago
0 OPS 3674 (VELA 4)
1 00837U 64040B   25104.64541123  .00000407  00000-0  00000-0 0  9991
2 00837  48.6998 131.9020 4420611 260.1689   0.5585  0.24000412 53699
Epoch: 2025-04-14T15:29Z
Definitive object data (Epoch: 2025-04-14T15:29:23.53Z)
Latitude
-47.67315°
Longitude
-47.76481°
Altitude
54,123.65 km
Speed
3.088 km/s
True Right ascension
01h 50m 33s
True Declination
-47° 39' 11"
Sunlit
Object was in daylight at TLE epoch
Visualization TLE readout
Latitude
-4.35814°
Longitude
-120.15028°
Altitude
71,372.792 km
Speed
2.571 km/s
Apparent Right ascension
20h 52m 15s
Apparent Declination
-6° 59' 22"
Sunlit
Object is in daylight
Visualization observer readout
Local Sidereal Time
06:23:20
Azimuth
304.567° NW
Elevation
-43.175°
Doppler factor
1
Orbital elements
Apogee altitude
151,349.203 km
Perigee altitude
54,647.168 km
Semi-major axis
109,376.322 km
Eccentricity
0.4420611
Inclination
48.6998°
RAAN
131.902°
Arg. of periapsis
260.1689°
True anomaly
1.60916°
Mean anomaly
0.5585°
Eccentric anomaly
1.00097°
Mean motion
0.06 °/min
BSTAR
Unknown
Orbital period
5999.9 mins
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Other satellites on launch #40 in the year 1964 (1964-07-17 UTC)

OPS 3674 (VELA 4) Visibility forecast

Observer location: undefined°, undefined°

Span
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Start Az.
Max El. time (UTC)
Max El. Az.
Max El.
End time (UTC)
End Az.
147 mins2025-05-01 20:20:17.799Z102.525° ESE2025-05-01 22:47:17.799Z120.831° SE31.67°2025-05-01 22:47:17.799Z120.831° SE
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