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: 23 hours ago
TLE from 23 hours ago
0 EXPLORER 11
1 00107U 61013A 25315.21671094 .00003414 00000-0 39983-3 0 9992
2 00107 28.7862 132.1002 0499487 254.2994 100.1950 14.20851608245459Epoch: 2025-11-11T05:12Z
TLE epoch observation values (Epoch: 2025-11-11T05:12:03.825Z)
Latitude
0.00002°
Longitude
3.47785°
Altitude
901.614 km
Speed
7.362 km/s
True Right ascension
08h 48m 24s
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
01:05:29
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,186.346 km
Perigee altitude
466.623 km
Semi-major axis
7,204.621 km
Eccentricity
0.04995
Inclination
28.7862°
RAAN
132.1002°
Arg. of periapsis
254.2994°
True anomaly
105.75799°
Mean anomaly
100.195°
Eccentric anomaly
102.98368°
Mean motion
3.54917 °/min
Orbital period
101.43 mins
BSTAR
0.00039983
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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 | 2025-11-12 15:08:40.682Z | 201.533° SSW | 2025-11-12 15:13:40.682Z | 153.783° SSE | 20.811° | 2025-11-12 15:18:40.682Z | 112.763° SE |
| 11 mins | 2025-11-12 16:55:40.682Z | 226.998° WSW | 2025-11-12 17:00:40.682Z | 173.478° S | 29.369° | 2025-11-12 17:06:40.682Z | 115.882° SE |
| 12 mins | 2025-11-12 18:42:40.682Z | 243.986° WSW | 2025-11-12 18:48:40.682Z | 183.715° SSW | 28.388° | 2025-11-12 18:54:40.682Z | 129.546° SE |
| 8 mins | 2025-11-12 20:31:40.682Z | 239.025° WSW | 2025-11-12 20:35:40.682Z | 203.496° SW | 18.615° | 2025-11-12 20:39:40.682Z | 166.276° S |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in ascending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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