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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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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   26080.70849825  .00002947  00000-0  34614-3 0  9991
2 00107  28.7740 100.7176 0494327  31.4745 331.4450 14.21811121264030

Epoch: 2026-03-21T17:00Z

TLE epoch observation values (Epoch: 2026-03-21T17:00:14.248Z)

Latitude

-0.00005°

Longitude

26.43282°

Altitude

509.458 km

Speed

7.772 km/s

True Right ascension

06h 42m 52s

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

12:39:29

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,179.231 km

Perigee altitude

467.264 km

Semi-major axis

7,201.384 km

Eccentricity

0.04943

Inclination

28.774°

RAAN

100.7176°

Arg. of periapsis

31.4745°

True anomaly

328.58351°

Mean anomaly

331.445°

Eccentric anomaly

330.03015°

Mean motion

3.55156 °/min

Orbital period

101.36 mins

BSTAR

0.00034614

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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	2026-03-22 08:34:38.685Z	221.413° SW	2026-03-22 08:36:38.685Z	191.492° SSW	17.815°	2026-03-22 08:39:38.685Z	149.05° 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: 2026-03-21T17:00:14.248Z)

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