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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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Identifier

1806, 1965-098B

Orbit

LEO

Country

Related business

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

APL

Mission

Spacecraft

Bus & Motor

DME, Unknown motor

Mass

98 kg wet, 98 kg dry

Launch date (UTC)

1965-11-29 (61 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, 1.1 m

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 31 (ISIS-X)
1 01806U 65098B   26292.12885707 -.00000125  00000-0 -42203-4 0  9997
2 01806  79.7792 247.5649 1421769 251.6435  92.5215 12.08431365663665

Epoch: 2026-10-19T03:05Z

TLE epoch observation values (Epoch: 2026-10-19T03:05:33.250Z)

Latitude

0.00004°

Longitude

173.56511°

Altitude

1,854.375 km

Speed

6.869 km/s

True Right ascension

16h 30m 15s

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

13:05:04

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

2,780.877 km

Perigee altitude

500.669 km

Semi-major axis

8,018.91 km

Eccentricity

0.14218

Inclination

79.7792°

RAAN

247.5649°

Arg. of periapsis

251.6435°

True anomaly

108.4638°

Mean anomaly

92.5215°

Eccentric anomaly

100.53044°

Mean motion

3.02253 °/min

Orbital period

119.11 mins

BSTAR

-0.000042203

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

THOR AGENA B DEB, 1944 (Decayed)

THOR AGENA B R/B, 1807

THOR AGENA B DEB, 2092

THOR AGENA B DEB, 1948

ALOUETTE 2 DEB, 20833 (Decayed)

THOR AGENA B DEB, 1951

ALOUETTE 2, 1804

ALOUETTE 2 DEB, 25058 (Decayed)

THOR AGENA B DEB, 2153

THOR AGENA B DEB, 1808 (Decayed)

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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

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EXPLORER 31 (ISIS-X) 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.
10 mins	2026-10-19 19:12:36.724Z	85.805° E	2026-10-19 19:17:36.724Z	64.596° ENE	13.571°	2026-10-19 19:22:36.724Z	44.883° NE
25 mins	2026-10-19 21:03:36.724Z	157.973° S	2026-10-19 21:13:36.724Z	94.099° ESE	55.898°	2026-10-19 21:28:36.724Z	17.861° NNE
26 mins	2026-10-19 23:03:36.724Z	220.634° SW	2026-10-19 23:14:36.724Z	287.367° WNW	52.326°	2026-10-19 23:29:36.724Z	5.129° NNE
16 mins	2026-10-20 01:13:36.724Z	288.62° WNW	2026-10-20 01:20:36.724Z	318.072° NNW	16.891°	2026-10-20 01:29:36.724Z	353.862° N
8 mins	2026-10-20 05:39:36.724Z	16.581° NNE	2026-10-20 05:43:36.724Z	34.374° NE	12.954°	2026-10-20 05:47:36.724Z	53.96° ENE
20 mins	2026-10-20 07:37:36.724Z	356.226° N	2026-10-20 07:49:36.724Z	63.965° ENE	45.295°	2026-10-20 07:57:36.724Z	132.281° SE
19 mins	2026-10-20 09:39:36.724Z	339.704° N	2026-10-20 09:50:36.724Z	271.87° WNW	49.654°	2026-10-20 09:58:36.724Z	202.506° SW

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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 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.

EXPLORER 31 (ISIS-X), 1806

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: 2026-10-19T03:05:33.250Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

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

EXPLORER 31 (ISIS-X) Visibility forecast

Co-orbital & Co-planar RSOs

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

Documentation

Expand to show TLE details & history
Last TLE update: 15 hours ago