Key statistics
Satellite EXPLORER 25 (INJUN-4) at a glance.
Uptime
22303
Days in orbit
Revolutions
≈ 12.7
Per day
Orbit
HEO
HEO
Inclination
81.3
Latest
Satellite identification and parameters
Extended collection of information and parameters for EXPLORER 25 (INJUN-4).
Object identification
Identified? True
Debris? False
Object name: EXPLORER 25 (INJUN-4)
International designator: 1964-076B
Object number (NORAD): 932
Object ID (CCSDS): 932
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 113.658 minutes
Inclination: 81.3384 deg
SMA: 7772.496 km
Apoapsis: 2264.103 km
Periapsis: 524.62 km
RAAN: 162.362 deg
Eccentricy: 0.11189986
Argument of periapsis: 332.3581 deg
Mean anomaly: 22.2043 deg
Mean motion: 12.66957252 rev/day
Mean motion (dot): 0.00000654 rev/day2
B* drag term: 0.00023149203 1/REarth
Two-line elements (TLE)
Creation date: Dec. 12, 2025, 10:14 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 12, 2025, 5:42 a.m. UTC
TLE line 0: 0 EXPLORER 25 (INJUN-4)
TLE line 1: 1 00932U 64076B 25346.23776056 .00000654 00000-0 23149-3 0 9990
TLE line 2: 2 00932 81.3384 162.3620 1118999 332.3581 22.2043 12.66957252795454
Live tracking on map
Real-time ground track for satellite EXPLORER 25 (INJUN-4).
In-orbit conjunctions
A list of the most updated potential collisions computed for object EXPLORER 25 (INJUN-4).
Associated space launch
Explorer 24 was placed in orbit together with Explorer 25 from a single launch vehicle. Explorer 24 was identical in configuration to the previously launched balloon satellites Explorer 9 and 19. The spacecraft was 3.6 m in diameter, was built of alternating layers of aluminum foil and plastic film, and was covered uniformly with 5.1-cm white dots for thermal control. It was designed to yield atmospheric density near perigee as a function of space and time from sequential observations of the sphere's position in orbit.
EXPLORER 25 (INJUN-4) was lifted into orbit during the mission ‘Scout X-4 | Explorer 24 & 25’, on board a Scout X-4 space rocket.
The launch took place on Nov. 21, 1964, 5:09 p.m. from Space Launch Complex 5.
For more information about the launch, click the button.
Scout X-4 | Explorer 24 & 25
Agency: N/A
Status: Launch Successful
Launch date: Nov. 21, 1964, 5:09 p.m. UTC
Rocket: Scout X-4
Launch pad: Space Launch Complex 5
Location: Vandenberg SFB, CA, USA
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