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
11 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 11 hours ago
0 GREB
1 00731U 64001E 25183.76494394 .00000005 00000-0 42330-4 0 9998
2 00731 69.9070 297.7800 0011540 123.0403 237.1812 13.96238413128804Epoch: 2025-07-02T18:21Z
TLE epoch observation values (Epoch: 2025-07-02T18:21:31.156Z)
Latitude
-0.00005°
Longitude
101.35881°
Altitude
913.72 km
Speed
7.393 km/s
True Right ascension
19h 51m 07s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
54.41995°
Longitude
-110.18951°
Altitude
906.804 km
Speed
7.408 km/s
Apparent Right ascension
05h 21m 02s
Apparent Declination
11° 22' 19"
Sunlit
Visualization observer readout
Local Sidereal Time
17:00:19
Azimuth
353.512° N
Elevation
-38.487°
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. |
|---|---|---|---|---|---|---|---|
| 9 mins | 2025-07-03 08:13:50.901Z | 162.859° S | 2025-07-03 08:17:50.901Z | 111.591° ESE | 29.166° | 2025-07-03 08:22:50.901Z | 45.558° ENE |
| 9 mins | 2025-07-03 09:59:50.901Z | 245.732° WSW | 2025-07-03 10:03:50.901Z | 306.615° NW | 30.669° | 2025-07-03 10:08:50.901Z | 8.039° NNE |
| 7 mins | 2025-07-03 17:15:50.901Z | 8.878° NNE | 2025-07-03 17:18:50.901Z | 44.183° NE | 20.585° | 2025-07-03 17:22:50.901Z | 93.752° ESE |
| 10 mins | 2025-07-03 19:00:50.901Z | 325.551° NNW | 2025-07-03 19:05:50.901Z | 227.098° WSW | 40.625° | 2025-07-03 19:10:50.901Z | 171.745° S |
Event ID | Pc | Md | Secondary | Secondary name | Country | Click to unsort rows by TCA header |
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