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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

Last TLE update

14 hours ago

Origin

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

NASA MSFC

Mission

Civil Astronomy

Bus & Motor

S-15, Unknown motor

Mass

45 kg wet, 40 kg dry

Launch date (UTC)

1961-04-27 (64 years ago)

Launch vehicle

JUNO II

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 0.6 m

Radar Cross Section

0.295 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 14 hours ago

0 EXPLORER 11
1 00107U 61013A   25199.88645024  .00001164  00000-0  12268-3 0  9996
2 00107  28.7900  75.1250 0503638 260.3779  93.9564 14.19872543229042

Epoch: 2025-07-18T21:16Z

TLE epoch observation values (Epoch: 2025-07-18T21:16:29.3Z)

Latitude

-0.00004°

Longitude

179.07138°

Altitude

867.224 km

Speed

7.399 km/s

True Right ascension

05h 00m 29s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

18.77351°

Longitude

-146.22609°

Altitude

1,075.598 km

Speed

7.189 km/s

Apparent Right ascension

09h 06m 17s

Apparent Declination

-9° 32' 03"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

23:48:01

Azimuth

60.994° ENE

Elevation

-43.002°

Doppler factor

Orbital elements

Apogee altitude

1,192.81 km

Perigee altitude

466.773 km

Semi-major axis

7,207.929 km

Eccentricity

0.05036

Inclination

28.79°

RAAN

75.125°

Arg. of periapsis

260.3779°

True anomaly

99.67948°

Mean anomaly

93.9564°

Eccentric anomaly

96.82161°

Mean motion

3.54672 °/min

Orbital period

101.5 mins

BSTAR

0.00012268

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

EXPLORER 11 DEB, 3739 (Decayed)

EXPLORER 11 Visibility forecast

Observer location: undefined°, undefined°

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	2025-07-19 19:26:31.523Z	208.041° SW	2025-07-19 19:31:31.523Z	160.251° S	22.885°	2025-07-19 19:36:31.523Z	115.317° SE
12 mins	2025-07-19 21:13:31.523Z	232.782° WSW	2025-07-19 21:19:31.523Z	168.73° S	29.817°	2025-07-19 21:25:31.523Z	115.792° SE
11 mins	2025-07-19 23:01:31.523Z	243.144° WSW	2025-07-19 23:06:31.523Z	194.768° SSW	27.484°	2025-07-19 23:12:31.523Z	135.779° SSE
7 mins	2025-07-20 00:50:31.523Z	236.71° WSW	2025-07-20 00:54:31.523Z	201.865° SSW	16.487°	2025-07-20 00:57:31.523Z	174.874° S

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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Authenticating...

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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.