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EXPLORER 31 (ISIS-X), 1806

Orbit data source: Space-Track

EXPLORER 31 (ISIS-X), 1806 is a payload satellite owned by GSFC (US) 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

6 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 6 hours ago

0 EXPLORER 31 (ISIS-X)
1 01806U 65098B   25195.59003583  .00000479  00000-0  15929-3 0  9997
2 01806  79.7755 268.1848 1424846  76.1338 299.3727 12.07917448607927

Epoch: 2025-07-14T14:09Z

TLE epoch observation values (Epoch: 2025-07-14T14:09:39.095Z)

Latitude

-0.00003°

Longitude

123.07517°

Altitude

1,223.706 km

Speed

7.432 km/s

True Right ascension

17h 52m 44s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow at epoch

Visualization orbit readout

Latitude

12.84472°

Longitude

125.21292°

Altitude

999.969 km

Speed

7.644 km/s

Apparent Right ascension

19h 05m 57s

Apparent Declination

-12° 06' 03"

Sunlit

Object is in full shadow

Visualization observer readout

Local Sidereal Time

08:42:31

Azimuth

44.161° NE

Elevation

-54.973°

Doppler factor

Orbital elements

Apogee altitude

2,785.944 km

Perigee altitude

500.153 km

Semi-major axis

8,021.186 km

Eccentricity

0.14248

Inclination

79.7755°

RAAN

268.1848°

Arg. of periapsis

76.1338°

True anomaly

Unknown

Mean anomaly

299.3727°

Eccentric anomaly

Unknown

Mean motion

3.02124 °/min

Orbital period

119.16 mins

BSTAR

0.00015929

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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.
8 mins	2025-07-15 06:10:12.854Z	206.031° SW	2025-07-15 06:15:12.854Z	287.216° WNW	37.511°	2025-07-15 06:18:12.854Z	355.547° N
11 mins	2025-07-15 16:33:12.854Z	351.726° N	2025-07-15 16:36:12.854Z	31.841° NE	44.803°	2025-07-15 16:44:12.854Z	169.083° S

Authenticating...

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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.