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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

STEP CYL, 0.6 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 1 day ago

TLE from 1 day ago

0 EXPLORER 11
1 00107U 61013A   26206.98505790  .00003277  00000-0  38302-3 0  9996
2 00107  28.7757  92.6917 0492473 130.8110 233.6252 14.22375464282028

Epoch: 2026-07-25T23:38Z

TLE epoch observation values (Epoch: 2026-07-25T23:38:29.002Z)

Latitude

-0.00004°

Longitude

154.3813°

Altitude

1,036.614 km

Speed

7.223 km/s

True Right ascension

06h 10m 45s

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

15:53:14

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,175.899 km

Perigee altitude

466.789 km

Semi-major axis

7,199.481 km

Eccentricity

0.04925

Inclination

28.7757°

RAAN

92.6917°

Arg. of periapsis

130.811°

True anomaly

229.24595°

Mean anomaly

233.6252°

Eccentric anomaly

231.41942°

Mean motion

3.55297 °/min

Orbital period

101.32 mins

BSTAR

0.00038302

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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	2026-07-27 19:40:32.399Z	198.209° SSW	2026-07-27 19:43:32.399Z	165.24° S	15.057°	2026-07-27 19:45:32.399Z	140.312° SSE
6 mins	2026-07-27 21:27:32.399Z	218.277° SW	2026-07-27 21:30:32.399Z	175.083° S	19.283°	2026-07-27 21:33:32.399Z	131.803° SE

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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: 1 day ago

TLE from 1 day ago

TLE epoch observation values (Epoch: 2026-07-25T23:38:29.002Z)

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: 1 day ago