EXPLORER 11, 107
Orbit data source: Space-Track
EXPLORER 11, 107 is a payload satellite owned by GSFC (US) in LEO that was launched on Thu, 27 Apr 1961 UTC via a JUNO II launch vehicle from the Air Force Eastern Test Range (AFETR). 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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107 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
NASA MSFC
Mission
Spacecraft
Bus & Motor
S-15, Unknown motor
Mass
45 kg wet, 40 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Medium (>0.1 m² and <1 m²)
Expand to show TLE details & historyLast TLE update: 1 day ago
TLE from 1 day ago
0 EXPLORER 11
1 00107U 61013A 25355.11689980 .00001527 00000-0 16694-3 0 9995
2 00107 28.7841 262.4737 0498272 266.2097 88.1390 14.21041836251136Epoch: 2025-12-21T02:48Z
TLE epoch observation values (Epoch: 2025-12-21T02:48:20.142Z)
Latitude
0.00001°
Longitude
130.45583°
Altitude
826.408 km
Speed
7.439 km/s
True Right ascension
17h 29m 53s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
05:37:23
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,184.796 km
Perigee altitude
466.888 km
Semi-major axis
7,203.979 km
Eccentricity
0.04983
Inclination
28.7841°
RAAN
262.4737°
Arg. of periapsis
266.2097°
True anomaly
93.84787°
Mean anomaly
88.139°
Eccentric anomaly
90.99346°
Mean motion
3.54964 °/min
Orbital period
101.42 mins
BSTAR
0.00016694
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Other satellites on launch #13 in the year 1961 (1961-04-27 UTC)
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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.EXPLORER 11 Visibility forecast
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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. |
|---|---|---|---|---|---|---|---|
| 10 mins | 2025-12-22 21:10:33.845Z | 203.322° SW | 2025-12-22 21:15:33.845Z | 153.803° SSE | 20.64° | 2025-12-22 21:20:33.845Z | 112.284° ESE |
| 11 mins | 2025-12-22 22:57:33.845Z | 227.834° WSW | 2025-12-22 23:02:33.845Z | 172.632° S | 29.252° | 2025-12-22 23:08:33.845Z | 115.989° SE |
| 12 mins | 2025-12-23 00:44:33.845Z | 243.798° WSW | 2025-12-23 00:50:33.845Z | 182.654° SSW | 28.108° | 2025-12-23 00:56:33.845Z | 130.444° SE |
| 8 mins | 2025-12-23 02:33:33.845Z | 237.949° WSW | 2025-12-23 02:37:33.845Z | 202.889° SW | 18.498° | 2025-12-23 02:41:33.845Z | 167.243° S |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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