Key statistics
Satellite EXPLORER 31 (ISIS-X) at a glance.
Uptime
21771
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: 119.214 minutes
Inclination: 79.776 deg
SMA: 8023.769 km
Apoapsis: 2789.067 km
Periapsis: 502.201 km
RAAN: 273.8494 deg
Eccentricy: 0.1425057
Argument of periapsis: 89.5942 deg
Mean anomaly: 286.7737 deg
Mean motion: 12.07911573 rev/day
Mean motion (dot): 0.00000372 rev/day2
B* drag term: 0.00012134 1/REarth
Two-line elements (TLE)
Creation date: July 8, 2025, 2:27 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: July 7, 2025, 5:10 p.m. UTC
TLE line 0: 0 EXPLORER 31 (ISIS-X)
TLE line 1: 1 01806U 65098B 25188.71579022 .00000372 00000-0 12134-3 0 9996
TLE line 2: 2 01806 79.7760 273.8494 1425057 89.5942 286.7737 12.07911573607099
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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