Key statistics
Satellite EXPLORER 25 (INJUN-4) at a glance.
Uptime
22246
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: 113.667 minutes
Inclination: 81.3431 deg
SMA: 7772.909 km
Apoapsis: 2265.468 km
Periapsis: 524.08 km
RAAN: 204.8593 deg
Eccentricy: 0.1120165
Argument of periapsis: 97.6415 deg
Mean anomaly: 275.3099 deg
Mean motion: 12.66856388 rev/day
Mean motion (dot): 0.00000915 rev/day2
B* drag term: 0.00031547668 1/REarth
Two-line elements (TLE)
Creation date: Oct. 18, 2025, 2:17 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 17, 2025, 11:05 p.m. UTC
TLE line 0: 0 EXPLORER 25 (INJUN-4)
TLE line 1: 1 00932U 64076B 25290.96185023 .00000915 00000-0 31548-3 0 9998
TLE line 2: 2 00932 81.3431 204.8593 1120165 97.6415 275.3099 12.66856388788455
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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