EXPLORER 20, 870
Orbit data source: Space-Track
EXPLORER 20, 870 is a payload satellite owned by GSFC (US) in LEO that was launched on Tue, 25 Aug 1964 UTC via an SCOUT X-4 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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Edit Public Description
| Identifier | |
| Orbit | LEO |
| Last TLE update | 11 hours ago |
| Origin | |
| Manufacturer | Cutler-Hammer/AIL |
| Mission | Civil Science |
| Bus & Motor | S-48, Unknown motor |
| Mass | 44 kg wet, 44 kg dry |
| Launch date (UTC) | |
| Launch vehicle | |
| Launch site | |
| Object type | Payload Rocket body Debris |
| Shape & HBR | Double Cone + 6 Rod, 37 m |
| Radar Cross Section | 0.292 m², Medium (>0.1 m² and < 1m²) |
Expand to show TLE details & history
TLE from 11 hours ago
0 EXPLORER 20
1 870U 64051A 25084.64387500 .00000506 00000-0 37793-3 0 9996
2 870 79.8981 46.8267 0097762 22.9775 337.5709 13.91658362 71517Epoch: 2025-03-25T15:27Z
Definitive object data (Epoch: 2025-03-25T15:27:10.8Z)
| Latitude | 0.00004° |
| Longitude | -8.31123° |
| Altitude | 859.767 km |
| Speed | 7.456 km/s |
| True Right ascension | 03h 07m 18s |
| True Declination | 0° 00' 00" |
| Sunlit | Object was in daylight at TLE epoch |
Visualization TLE readout
| Latitude | 65.82247° |
| Longitude | 14.45574° |
| Altitude | 884.167 km |
| Speed | 7.442 km/s |
| Apparent Right ascension | 21h 47m 51s |
| Apparent Declination | 37° 35' 05" |
| Sunlit | Object is in daylight |
Visualization observer readout
| Local Sidereal Time | 07:22:06 |
| Azimuth | 331.775° NNW |
| Elevation | -5.601° |
| Doppler factor | 1 |
Orbital elements
| Apogee altitude | 991.441 km |
| Perigee altitude | 848.743 km |
| Semi-major axis | 7,298.229 km |
| Eccentricity | 0.0097762 |
| Inclination | 79.8981° |
| RAAN | 46.8267° |
| Arg. of periapsis | 22.9775° |
| True anomaly | 337.1386° |
| Mean anomaly | 337.5709° |
| Eccentric anomaly | 337.35524° |
| Mean motion | 3.4811 °/min |
| BSTAR | 0.00037793 |
| Orbital period | 103.42 mins |
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Other satellites on launch #51 in the year 1964 (1964-08-25 UTC)
| SCOUT X-4 R/B, 871 |
| SCOUT X-4 DEB, 873 (Decayed) |
| SCOUT X-4 DEB, 874 (Decayed) |
| SCOUT X-4 DEB, 875 (Decayed) |
| SCOUT X-4 DEB, 40592 (Decayed) |
EXPLORER 20 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. |
|---|---|---|---|---|---|---|---|
| 6 mins | 2025-03-26 07:33:27.780Z | 28.719° NE | 2025-03-26 07:36:27.780Z | 59.054° ENE | 14.995° | 2025-03-26 07:39:27.780Z | 91.073° ESE |
| 10 mins | 2025-03-26 09:17:27.780Z | 345.124° N | 2025-03-26 09:22:27.780Z | 227.081° WSW | 44.146° | 2025-03-26 09:27:27.780Z | 176.692° S |
| 5 mins | 2025-03-26 20:56:27.780Z | 110.467° ESE | 2025-03-26 20:58:27.780Z | 85.103° E | 16.769° | 2025-03-26 21:01:27.780Z | 50.813° ENE |
| 9 mins | 2025-03-26 22:38:27.780Z | 211.601° SW | 2025-03-26 22:42:27.780Z | 287.511° WNW | 39.465° | 2025-03-26 22:47:27.780Z | 1.113° NNE |
Event ID | Pc | Md | Secondary | Secondary name | Country | Click to unsort rows by TCA header |
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