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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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<iframe src="https://www.satcat.com/sats-embedded/107?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/107?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

107, 1961-013A

Orbit

LEO

Country

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

NASA MSFC

Mission

Spacecraft

Bus & Motor

S-15, Unknown motor

Mass

45 kg wet, 40 kg dry

Launch date (UTC)

1961-04-27 (65 years ago)

Launch vehicle

JUNO II

Launch site

Air Force Eastern Test Range (AFETR)

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: 15 hours ago

TLE from 15 hours ago

0 EXPLORER 11
1 00107U 61013A   25340.71883469  .00002922  00000-0  34187-3 0  9990
2 00107  28.7829 345.3425 0498800 131.9898 232.4271 14.20988339249081

Epoch: 2025-12-06T17:15Z

TLE epoch observation values (Epoch: 2025-12-06T17:15:07.317Z)

Latitude

0.00002°

Longitude

10.8195°

Altitude

1,050.058 km

Speed

7.212 km/s

True Right ascension

23h 01m 22s

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

05:54:57

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,185.366 km

Perigee altitude

466.679 km

Semi-major axis

7,204.16 km

Eccentricity

0.04988

Inclination

28.7829°

RAAN

345.3425°

Arg. of periapsis

131.9898°

True anomaly

228.06721°

Mean anomaly

232.4271°

Eccentric anomaly

230.23044°

Mean motion

3.54951 °/min

Orbital period

101.42 mins

BSTAR

0.00034187

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Other satellites on launch #13 in the year 1961 (1961-04-27 UTC)

EXPLORER 11 DEB, 3739 (Decayed)

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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.
5 mins	2025-12-08 04:58:03.594Z	206.192° SW	2025-12-08 05:00:03.594Z	179.438° S	18.18°	2025-12-08 05:03:03.594Z	135.244° SSE
4 mins	2025-12-08 06:45:03.594Z	221.066° SW	2025-12-08 06:47:03.594Z	190.684° SSW	17.382°	2025-12-08 06:49:03.594Z	156.227° SSE

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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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Check out EXPLORER 11, 107 on other resources

View EXPLORER 11, 107 on NASA - NSSDCA Website

View EXPLORER 11, 107 on Heavens-Above

View EXPLORER 11, 107 on Keep Track

View EXPLORER 11, 107 on Celestrak

View EXPLORER 11, 107 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

EXPLORER 11, 107

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 15 hours ago

TLE from 15 hours ago

TLE epoch observation values (Epoch: 2025-12-06T17:15:07.317Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #13 in the year 1961 (1961-04-27 UTC)

EXPLORER 11 Visibility forecast

Co-orbital & Co-planar RSOs

Check out EXPLORER 11, 107 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 15 hours ago