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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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
STEP CYL, 1.1 m
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 26260.10407164 .00001136 00000-0 11762-3 0 9999
2 00107 28.7768 146.2597 0491762 267.2086 87.2127 14.22497011289593Epoch: 2026-09-17T02:29Z
TLE epoch observation values (Epoch: 2026-09-17T02:29:51.789Z)
Latitude
-0°
Longitude
112.7478°
Altitude
815.464 km
Speed
7.448 km/s
True Right ascension
09h 45m 02s
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
00:25:41
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,174.957 km
Perigee altitude
466.911 km
Semi-major axis
7,199.071 km
Eccentricity
0.04918
Inclination
28.7768°
RAAN
146.2597°
Arg. of periapsis
267.2086°
True anomaly
92.84898°
Mean anomaly
87.2127°
Eccentric anomaly
90.03029°
Mean motion
3.55327 °/min
Orbital period
101.32 mins
BSTAR
0.00011762
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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. |
|---|---|---|---|---|---|---|---|
| 8 mins | 2026-09-18 19:07:12.046Z | 189.827° SSW | 2026-09-18 19:11:12.046Z | 152.174° SSE | 16.98° | 2026-09-18 19:15:12.046Z | 118.289° SE |
| 11 mins | 2026-09-18 20:53:12.046Z | 221.064° SW | 2026-09-18 20:58:12.046Z | 166.745° S | 31.153° | 2026-09-18 21:04:12.046Z | 112.339° ESE |
| 12 mins | 2026-09-18 22:40:12.046Z | 239.945° WSW | 2026-09-18 22:45:12.046Z | 189.213° SSW | 34.686° | 2026-09-18 22:52:12.046Z | 122.967° SE |
| 10 mins | 2026-09-19 00:28:12.046Z | 242.541° WSW | 2026-09-19 00:33:12.046Z | 195.788° SSW | 24.526° | 2026-09-19 00:38:12.046Z | 151.07° SSE |
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 descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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