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DOY 175 | 2024-06-23T11:50:45Z
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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 a 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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EXPLORER 20 details
NORAD ID870
COSPAR ID
1964-051A
Orbit
LEO
Last TLE update14 hours ago
Origin
Flag of USGSFC (US)
ManufacturerCutler-Hammer/AIL
BusS-48
MotorUnknown
Mass44 kg wet, 44 kg dry
Launch date (UTC)
1964-08-25 (60 years ago)
Launch vehicle
Scout X-4
Launch site
Air Force Western Test Range (AFWTR)
Object type
Payload
Rocket body
Debris
Radar Cross Section0.53 m², Medium (>0.1 m² and < 1m²)
Predictive object data (real-time)
Latitude37.99698°
Longitude114.65643°
Altitude859.223 km
Speed7.462 km/s
Apparent Right ascension02h 26m 01s
Apparent Declination17° 00' 50"
Sunlit
Object is in daylight
Predictive observer data (real-time)
Local Sidereal Time22:58:50
Azimuth101.662° ESE
Elevation39.895°
Doppler factor1
Orbital elements
Apogee991.836 km
Perigee849.573 km
Semi-major axis7,298.842 km
Eccentricity0.0097456
Inclination79.8982°
RAAN346.7915°
Arg. of periapsis27.1712°
True anomaly332.94483°
Mean anomaly333.4495°
Mean motion3.48067 °/min
BSTAR0.00010138
Period103.43 mins
Definitive object data (Epoch: 2024-06-22T21:51:34.025Z)
Latitude-0.00003°
Longitude107.33236°
Altitude862.74 km
Speed7.453 km/s
True Right ascension23h 07m 09s
True Declination0° 00' 00"
Sunlit
Object was in daylight at TLE epoch
TLE from 14 hours ago
0 EXPLORER 20
1 00870U 64051A   24174.91081048  .00000141  00000-0  10138-3 0  9992
2 00870  79.8982 346.7915 0097456  27.1712 333.4495 13.91483262 32696
Epoch: 2024-06-22T21:51Z
No data available

EXPLORER 20 Visibility forecast

Observer location: 39.9160978°, -105.1181434, 0m alt.

EXPLORER 20 is not visible in the next 10 days
Span
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Start Az.
Max El. time (UTC)
Max El. Az.
Max El.
End time (UTC)
End Az.