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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, 0.6 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 16 hours ago

TLE from 16 hours ago

0 EXPLORER 31 (ISIS-X)
1 01806U 65098B   26248.08675114 -.00000045  00000-0 -15960-4 0  9993
2 01806  79.7722 283.9258 1422689 338.0088  16.5311 12.08383924658343

Epoch: 2026-09-05T02:04Z

TLE epoch observation values (Epoch: 2026-09-05T02:04:55.298Z)

Latitude

0.00004°

Longitude

-91.50587°

Altitude

568.397 km

Speed

8.07 km/s

True Right ascension

18h 55m 42s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow 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

09:38:00

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

2,781.855 km

Perigee altitude

500.112 km

Semi-major axis

8,019.12 km

Eccentricity

0.14227

Inclination

79.7722°

RAAN

283.9258°

Arg. of periapsis

338.0088°

True anomaly

22.10454°

Mean anomaly

16.5311°

Eccentric anomaly

19.21366°

Mean motion

3.02241 °/min

Orbital period

119.11 mins

BSTAR

-0.00001596

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

ALOUETTE 2 DEB, 25058 (Decayed)

ALOUETTE 2, 1804

THOR AGENA B DEB, 1808 (Decayed)

THOR AGENA B DEB, 2092

THOR AGENA B DEB, 1948

THOR AGENA B DEB, 1951

THOR AGENA B R/B, 1807

THOR AGENA B DEB, 1944 (Decayed)

ALOUETTE 2 DEB, 20833 (Decayed)

THOR AGENA B DEB, 2153

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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.
9 mins	2026-09-06 02:03:07.318Z	120.63° SE	2026-09-06 02:07:07.318Z	71.984° E	19.886°	2026-09-06 02:12:07.318Z	33.171° NE
12 mins	2026-09-06 04:02:07.318Z	224.426° SW	2026-09-06 04:06:07.318Z	291.858° WNW	36.051°	2026-09-06 04:14:07.318Z	3.763° NNE
24 mins	2026-09-06 12:25:07.318Z	5.646° NNE	2026-09-06 12:36:07.318Z	68.672° E	32.455°	2026-09-06 12:49:07.318Z	128.782° SE
27 mins	2026-09-06 14:25:07.318Z	344.685° N	2026-09-06 14:37:07.318Z	274.519° WNW	44.012°	2026-09-06 14:52:07.318Z	183.735° SSW
18 mins	2026-09-06 16:28:07.318Z	319.699° NNW	2026-09-06 16:36:07.318Z	283.362° WNW	20.79°	2026-09-06 16:46:07.318Z	242.242° WSW

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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: 16 hours ago

TLE from 16 hours ago

TLE epoch observation values (Epoch: 2026-09-05T02:04:55.298Z)

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: 16 hours ago