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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731 intel report (Beta)
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Edit Public Description
Identifier
Orbit
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)
Launch vehicle
Launch site
Object type
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 13.96230073122228Epoch: 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
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
Visualization observer readout
Local Sidereal Time
15:38:53
Azimuth
176.124° S
Elevation
-30.367°
Doppler factor
1
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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 mins | 2025-05-13 18:22:08.955Z | 146.07° SSE | 2025-05-13 18:26:08.955Z | 102.126° ESE | 19.859° | 2025-05-13 18:30:08.955Z | 57.445° ENE |
| 10 mins | 2025-05-13 20:07:08.955Z | 224.947° SW | 2025-05-13 20:11:08.955Z | 290.486° WNW | 39.953° | 2025-05-13 20:17:08.955Z | 16.85° NNE |
| 4 mins | 2025-05-14 03:25:08.955Z | 27.671° NE | 2025-05-14 03:27:08.955Z | 50.197° ENE | 14.456° | 2025-05-14 03:29:08.955Z | 71.652° E |
| 10 mins | 2025-05-14 05:09:08.955Z | 337.708° N | 2025-05-14 05:13:08.955Z | 30.748° NE | 44.789° | 2025-05-14 05:19:08.955Z | 154.518° SSE |
Event ID | Pc | Md | Secondary | Secondary name | Country | Click to unsort rows by TCA header |
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