Key statistics
Satellite EXPLORER 31 (ISIS-X) at a glance.
Uptime
21831
Days in orbit
Revolutions
≈ 12.1
Per day
Orbit
HEO
HEO
Inclination
79.8
Latest
Satellite identification and parameters
Extended collection of information and parameters for EXPLORER 31 (ISIS-X).
Object identification
Identified? True
Debris? False
Object name: EXPLORER 31 (ISIS-X)
International designator: 1965-098B
Object number (NORAD): 1806
Object ID (CCSDS): 1806
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 119.207 minutes
Inclination: 79.7725 deg
SMA: 8023.444 km
Apoapsis: 2788.244 km
Periapsis: 502.375 km
RAAN: 225.6621 deg
Eccentricy: 0.14244936
Argument of periapsis: 335.0688 deg
Mean anomaly: 18.7552 deg
Mean motion: 12.07984884 rev/day
Mean motion (dot): 0.00000946 rev/day2
B* drag term: 0.00032999394 1/REarth
Two-line elements (TLE)
Creation date: Sept. 4, 2025, 10:13 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Sept. 4, 2025, 4:23 a.m. UTC
TLE line 0: 0 EXPLORER 31 (ISIS-X)
TLE line 1: 1 01806U 65098B 25247.18309207 .00000946 00000-0 32999-3 0 9997
TLE line 2: 2 01806 79.7725 225.6621 1424494 335.0688 18.7552 12.07984884614155
Live tracking on map
Real-time ground track for satellite EXPLORER 31 (ISIS-X).
Associated space launch
Canadian small ionospheric observatory instrumented with a sweep-frequency ionospheric sounder, a VLF receiver, an energetic particle experiment, a cosmic noise experiment, and an electrostatic probe.
EXPLORER 31 (ISIS-X) was lifted into orbit during the mission ‘Thor SLV-2 Agena B | Alouette 2’, on board a Thor SLV-2 Agena B space rocket.
The launch took place on Nov. 29, 1965, 4:48 a.m. from Space Launch Complex 2E.
For more information about the launch, click the button.
Thor SLV-2 Agena B | Alouette 2
Agency: N/A
Status: Launch Successful
Launch date: Nov. 29, 1965, 4:48 a.m. UTC
Rocket: Thor SLV-2 Agena B
Launch pad: Space Launch Complex 2E
Location: Vandenberg SFB, CA, USA
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