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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). 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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Identifier
870, 1964-051A
Orbit
LEO
Country
Flag of USUS
Related business
Manufacturer
Cutler-Hammer/AIL
Mission
Spacecraft
Bus & Motor
S-48, Unknown motor
Mass
44 kg wet, 44 kg dry
Launch date (UTC)
1964-08-25 (61 years ago)
Launch vehicle
SCOUT X-4
Launch site
Air Force Western Test Range (AFWTR)
Object type
Payload
Rocket body
Debris
Shape & HBR
Unknown
Radar Cross Section
Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 6 hours ago

TLE from 6 hours ago
0 EXPLORER 20
1   870U 64051A   26037.04532872  .00000154  00000-0  11173-3 0  9996
2   870  79.8955  61.4611 0096080 268.2531  90.7618 13.91761660115197
Epoch: 2026-02-06T01:05Z
TLE epoch observation values (Epoch: 2026-02-06T01:05:16.401Z)
Latitude
-0.00008°
Longitude
-91.04609°
Altitude
926.899 km
Speed
7.388 km/s
True Right ascension
04h 05m 50s
True Declination
0° 00' 00"
Sunlit
Object was in daylight at epoch
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
N/A
Visualization observer readout
Local Sidereal Time
09:12:47
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
989.849 km
Perigee altitude
849.613 km
Semi-major axis
7,297.868 km
Eccentricity
0.00961
Inclination
79.8955°
RAAN
61.4611°
Arg. of periapsis
268.2531°
True anomaly
91.86245°
Mean anomaly
90.7618°
Eccentric anomaly
91.31215°
Mean motion
3.48136 °/min
Orbital period
103.41 mins
BSTAR
0.00011173
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