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GREB, 731

Orbit data source: Space-Track

GREB, 731 is an American payload satellite in LEO that was launched on Sat, 11 Jan 1964 UTC via a THOR SLV-2A AGENA 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
731, 1964-001E
Orbit
LEO
Last TLE update
3 hours ago
Origin
Manufacturer
NRL
Mission
Defense Sigint
Bus & Motor
NRL 20", Unknown motor
Mass
29 kg wet, 29 kg dry
Launch date (UTC)
1964-01-11 (61 years ago)
Launch vehicle
THOR SLV-2A AGENA D
Launch site
Air Force Western Test Range (AFWTR)
Object type
Payload
Rocket body
Debris
Shape & HBR
Sphere, 0.5 m
Radar Cross Section
0.196 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 3 hours ago
0 GREB
1   731U 64001E   25133.18741494  .00000054  00000-0  78264-4 0  9994
2   731  69.9075  46.4351 0014323 193.0796 166.9940 13.96230073122228
Epoch: 2025-05-13T04:29Z
Definitive object data (Epoch: 2025-05-13T04:29:52.65Z)
Latitude
-0.00002°
Longitude
107.77597°
Altitude
919.354 km
Speed
7.387 km/s
True Right ascension
03h 05m 44s
True Declination
0° 00' 00"
Sunlit
Object was in daylight at TLE epoch
Visualization TLE readout
Latitude
-31.35373°
Longitude
-59.6594°
Altitude
908.23 km
Speed
7.402 km/s
Apparent Right ascension
16h 56m 55s
Apparent Declination
-79° 56' 31"
Sunlit
Object is in full shadow
Visualization observer readout
Local Sidereal Time
15:38:53
Azimuth
176.124° S
Elevation
-30.367°
Doppler factor
1
Orbital elements
Apogee altitude
915.363 km
Perigee altitude
894.5 km
Semi-major axis
7,283.068 km
Eccentricity
0.0014323
Inclination
69.9075°
RAAN
46.4351°
Arg. of periapsis
193.0796°
True anomaly
167.03087°
Mean anomaly
166.994°
Eccentric anomaly
167.01244°
Mean motion
3.49198 °/min
BSTAR
0.000078264
Orbital period
103.09 mins
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Other satellites on launch #1 in the year 1964 (1964-01-11 UTC)

GREB 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 mins2025-05-13 18:22:08.955Z146.07° SSE2025-05-13 18:26:08.955Z102.126° ESE19.859°2025-05-13 18:30:08.955Z57.445° ENE
10 mins2025-05-13 20:07:08.955Z224.947° SW2025-05-13 20:11:08.955Z290.486° WNW39.953°2025-05-13 20:17:08.955Z16.85° NNE
4 mins2025-05-14 03:25:08.955Z27.671° NE2025-05-14 03:27:08.955Z50.197° ENE14.456°2025-05-14 03:29:08.955Z71.652° E
10 mins2025-05-14 05:09:08.955Z337.708° N2025-05-14 05:13:08.955Z30.748° NE44.789°2025-05-14 05:19:08.955Z154.518° SSE
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