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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731 intel report (Beta)
GREB details
| Identifier | |
| Orbit | LEO |
| Last TLE update | 2 days 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 | 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 2 days ago
0 GREB
1 00731U 64001E 25001.65470997 .00000272 00000-0 23689-3 0 9999
2 00731 69.9069 328.9924 0014648 338.7493 21.3002 13.96182560103383Epoch: 2025-01-01T15:42Z
Definitive object data (Epoch: 2025-01-01T15:42:46.941Z)
| Latitude | -0.00001° |
| Longitude | -8.24807° |
| Altitude | 899.409 km |
| Speed | 7.408 km/s |
| True Right ascension | 21h 55m 58s |
| True Declination | 0° 00' 00" |
| Sunlit | Object was in daylight at TLE epoch |
Visualization TLE readout
| Latitude | -46.76952° |
| Longitude | -168.95661° |
| Altitude | 927.439 km |
| Speed | 7.386 km/s |
| Apparent Right ascension | 14h 48m 11s |
| Apparent Declination | -58° 33' 29" |
| Sunlit | Object is in daylight |
Visualization observer readout
| Local Sidereal Time | 06:30:37 |
| Azimuth | 137.228° SSE |
| Elevation | -50.664° |
| Doppler factor | 1 |
Orbital elements
| Apogee altitude | 915.765 km |
| Perigee altitude | 894.428 km |
| Semi-major axis | 7,283.234 km |
| Eccentricity | 0.0014648 |
| Inclination | 69.9069° |
| RAAN | 328.9924° |
| Arg. of periapsis | 338.7493° |
| True anomaly | 21.36128° |
| Mean anomaly | 21.3002° |
| Eccentric anomaly | 21.33073° |
| Mean motion | 3.49186 °/min |
| BSTAR | 0.00023689 |
| Orbital period | 103.1 mins |
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Other satellites on launch #1 in the year 1964 (1964-01-11 UTC)
| THOR AGENA D R/B, 727 |
| GGSE 1 (GGRS), 728 |
| SECOR 1B, 729 |
| SOLRAD 7A, 730 |
| GREB, 731 |
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. |
|---|---|---|---|---|---|---|---|
| 10 mins | 2025-01-03 07:48:31.537Z | 350.213° N | 2025-01-03 07:53:31.537Z | 55.741° ENE | 33.987° | 2025-01-03 07:58:31.537Z | 126.075° SE |
| 8 mins | 2025-01-03 09:35:31.537Z | 303.667° NW | 2025-01-03 09:39:31.537Z | 247.432° WSW | 25.851° | 2025-01-03 09:43:31.537Z | 201.452° SSW |
| 10 mins | 2025-01-03 22:51:31.537Z | 205.825° SW | 2025-01-03 22:56:31.537Z | 320.873° NNW | 44.844° | 2025-01-03 23:01:31.537Z | 23.121° NE |
| 4 mins | 2025-01-04 00:41:31.537Z | 298.01° NW | 2025-01-04 00:42:31.537Z | 309.192° NW | 14.532° | 2025-01-04 00:45:31.537Z | 341.828° N |
Authenticating...
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