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
15 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 15 hours ago
0 GREB
1 00731U 64001E 25181.75904212 .00000031 00000-0 61430-4 0 9991
2 00731 69.9070 302.0892 0011615 126.1704 234.0477 13.96238157128523Epoch: 2025-06-30T18:13Z
TLE epoch observation values (Epoch: 2025-06-30T18:13:01.239Z)
Latitude
-0.00004°
Longitude
109.76978°
Altitude
914.132 km
Speed
7.393 km/s
True Right ascension
20h 08m 21s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
10.64164°
Longitude
-75.45339°
Altitude
902.235 km
Speed
7.405 km/s
Apparent Right ascension
08h 02m 35s
Apparent Declination
-12° 49' 08"
Sunlit
Visualization observer readout
Local Sidereal Time
20:24:42
Azimuth
11.728° NNE
Elevation
-62.468°
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. |
|---|---|---|---|---|---|---|---|
| 11 mins | 2025-07-01 09:48:32.154Z | 214.914° SW | 2025-07-01 09:54:32.154Z | 315.124° NNW | 42.089° | 2025-07-01 09:59:32.154Z | 18.15° NNE |
| 10 mins | 2025-07-01 18:51:32.154Z | 340.872° N | 2025-07-01 18:56:32.154Z | 96.381° ESE | 43.305° | 2025-07-01 19:01:32.154Z | 148.721° SSE |
| 4 mins | 2025-07-01 20:39:32.154Z | 278.06° WNW | 2025-07-01 20:41:32.154Z | 255.05° W | 14.814° | 2025-07-01 20:43:32.154Z | 233.623° WSW |
| 7 mins | 2025-07-02 08:10:32.154Z | 143.499° SSE | 2025-07-02 08:13:32.154Z | 104.852° ESE | 22.758° | 2025-07-02 08:17:32.154Z | 55.884° ENE |
Event ID | Pc | Md | Secondary | Secondary name | Country | Click to unsort rows by TCA header |
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