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EXPLORER 31 (ISIS-X), 1806

Orbit data source: Space-Track

EXPLORER 31 (ISIS-X), 1806 is a payload satellite in LEO that was launched on Mon, 29 Nov 1965 UTC via a THOR SLV-2 AGENA B launch vehicle from the Air Force Western Test Range (AFWTR). 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 URL

https://www.satcat.com/sats-embedded/1806?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

1806, 1965-098B

Orbit

LEO

Last TLE update

13 hours ago

Origin

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

APL

Mission

Civil Science

Bus & Motor

DME, Unknown motor

Mass

98 kg wet, 98 kg dry

Launch date (UTC)

1965-11-29 (60 years ago)

Launch vehicle

THOR SLV-2 AGENA B

Launch site

Air Force Western Test Range (AFWTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Oct Cyl, 0.9 m

Radar Cross Section

0.700 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 13 hours ago

0 EXPLORER 31 (ISIS-X)
1  1806U 65098B   25151.85605335  .00001153  00000-0  39542-3 0  9998
2  1806  79.7788 304.2204 1425663 161.7403 204.0806 12.07883908602270

Epoch: 2025-05-31T20:32Z

TLE epoch observation values (Epoch: 2025-05-31T20:32:43.009Z)

Latitude

-0.00002°

Longitude

106.45075°

Altitude

2,715.601 km

Speed

6.166 km/s

True Right ascension

20h 16m 52s

True Declination

0° 00' 00"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

-74.46518°

Longitude

-33.79695°

Altitude

1,657.843 km

Speed

7.051 km/s

Apparent Right ascension

08h 28m 00s

Apparent Declination

-61° 19' 48"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

19:26:33

Azimuth

198.67° SSW

Elevation

-66.61°

Doppler factor

Orbital elements

Apogee altitude

2,786.769 km

Perigee altitude

499.625 km

Semi-major axis

8,021.334 km

Eccentricity

0.14257

Inclination

79.7788°

RAAN

304.2204°

Arg. of periapsis

161.7403°

True anomaly

Unknown

Mean anomaly

204.0806°

Eccentric anomaly

Unknown

Mean motion

3.02116 °/min

Orbital period

119.16 mins

BSTAR

0.00039542

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Other satellites on launch #98 in the year 1965 (1965-11-29 UTC)

ALOUETTE 2, 1804

THOR AGENA B R/B, 1807

THOR AGENA B DEB, 1808 (Decayed)

THOR AGENA B DEB, 1944 (Decayed)

THOR AGENA B DEB, 1948

THOR AGENA B DEB, 1951

THOR AGENA B DEB, 2092

THOR AGENA B DEB, 2153

ALOUETTE 2 DEB, 20833 (Decayed)

ALOUETTE 2 DEB, 25058 (Decayed)

EXPLORER 31 (ISIS-X) 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.
23 mins	2025-06-01 10:29:30.118Z	176.479° S	2025-06-01 10:43:30.118Z	106.833° ESE	43.362°	2025-06-01 10:52:30.118Z	17.546° NNE
18 mins	2025-06-01 12:34:30.118Z	233.941° WSW	2025-06-01 12:44:30.118Z	287.215° WNW	28.575°	2025-06-01 12:52:30.118Z	348.115° N
5 mins	2025-06-01 21:06:30.118Z	19.096° NNE	2025-06-01 21:09:30.118Z	76.103° E	22.632°	2025-06-01 21:11:30.118Z	116.704° SE
9 mins	2025-06-02 08:30:30.118Z	106.294° ESE	2025-06-02 08:35:30.118Z	81.662° E	14.799°	2025-06-02 08:39:30.118Z	58.824° ENE

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Check out EXPLORER 31 (ISIS-X), 1806 on other resources

View EXPLORER 31 (ISIS-X), 1806 on NASA - NSSDCA Website

View EXPLORER 31 (ISIS-X), 1806 on Heavens-Above

View EXPLORER 31 (ISIS-X), 1806 on Keep Track

View EXPLORER 31 (ISIS-X), 1806 on Celestrak

View EXPLORER 31 (ISIS-X), 1806 on Gunter's Space Page

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