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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). Payloads include a variety of satellites, spacecraft, and rockets 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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GREB details
Identifier
731, 1964-001E
Orbit
LEO
Last TLE update17 hours ago
Origin
Flag of USNRO/NRL (US)
ManufacturerNRL
MissionDefense Sigint
Bus & MotorNRL 20", Unknown motor
Mass29 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 & HBRSphere, 0.5 m
Radar Cross Section0.196 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 17 hours ago
0 GREB
1 00731U 64001E   25039.91140326  .00000104  00000-0  11491-3 0  9991
2 00731  69.9036 246.8129 0016329 296.1443  63.7982 13.96196788108729
Epoch: 2025-02-08T21:52Z
Definitive object data (Epoch: 2025-02-08T21:52:25.241Z)
Latitude-0.00003°
Longitude139.45523°
Altitude904.063 km
Speed7.403 km/s
True Right ascension16h 27m 15s
True Declination0° 00' 00"
Sunlit
Object was in daylight at TLE epoch
Visualization TLE readout
Latitude42.28009°
Longitude157.2236°
Altitude916.702 km
Speed7.396 km/s
Apparent Right ascension17h 55m 57s
Apparent Declination58° 05' 02"
Sunlit
Object is in daylight
Visualization observer readout
Local Sidereal Time17:36:30
Azimuth8.148° NNE
Elevation71.566°
Doppler factor1
Orbital elements
Apogee altitude916.94 km
Perigee altitude893.155 km
Semi-major axis7,283.185 km
Eccentricity0.0016329
Inclination69.9036°
RAAN246.8129°
Arg. of periapsis296.1443°
True anomaly63.96624°
Mean anomaly63.7982°
Eccentric anomaly63.88221°
Mean motion3.4919 °/min
BSTAR0.00011491
Orbital period103.1 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.
5 mins2025-02-09 15:17:06.212Z8.439° NNE2025-02-09 15:17:06.212Z8.439° NNE43.575°2025-02-09 15:22:06.212Z23.51° NE
5 mins2025-02-09 17:01:06.212Z293.246° NW2025-02-09 17:03:06.212Z315.496° NNW14.822°2025-02-09 17:06:06.212Z346.734° N
10 mins2025-02-10 00:14:06.212Z347.76° N2025-02-10 00:18:06.212Z45.893° ENE39.598°2025-02-10 00:24:06.212Z139.517° SSE
6 mins2025-02-10 02:01:06.212Z290.119° WNW2025-02-10 02:04:06.212Z251.901° W19.821°2025-02-10 02:07:06.212Z218.174° SW
5 mins2025-02-10 13:34:06.212Z125.002° SE2025-02-10 13:36:06.212Z100.74° ESE17.794°2025-02-10 13:39:06.212Z66.454° ENE
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