Key statistics
Satellite SCOUT X-4 R/B at a glance.
Uptime
22337
Days in orbit
Revolutions
≈ 14.0
Per day
Orbit
LEO
Low Earth Orbit
Inclination
79.9
Latest
Satellite identification and parameters
Extended collection of information and parameters for SCOUT X-4 R/B.
Object identification
Identified? True
Debris? False
Object name: SCOUT X-4 R/B
International designator: 1964-051B
Object number (NORAD): 871
Object ID (CCSDS): 871
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 102.817 minutes
Inclination: 79.8943 deg
SMA: 7270.041 km
Apoapsis: 955.22 km
Periapsis: 828.592 km
RAAN: 332.5406 deg
Eccentricy: 0.00870886
Argument of periapsis: 65.341 deg
Mean anomaly: 295.679 deg
Mean motion: 14.0054626 rev/day
Mean motion (dot): 0.00000389 rev/day2
B* drag term: 0.00024785289 1/REarth
Two-line elements (TLE)
Creation date: Oct. 20, 2025, 6:08 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 20, 2025, 2:10 p.m. UTC
TLE line 0: 0 SCOUT X-4 R/B
TLE line 1: 1 00871U 64051B 25293.59078741 .00000389 00000-0 24785-3 0 9993
TLE line 2: 2 00871 79.8943 332.5406 0087089 65.3410 295.6790 14.00546260111326
Live tracking on map
Real-time ground track for satellite SCOUT X-4 R/B.
In-orbit conjunctions
A list of the most updated potential collisions computed for object SCOUT X-4 R/B.
Associated space launch
Explorer 20 (IE A, Ionospheric Explorer A, TOPSI, Top Side Explorer or S 48) was designed to measure electron distribution, ion density and temperature, and to estimate cosmic noise levels between 2 and 7 MHz.
SCOUT X-4 R/B was lifted into orbit during the mission ‘Scout X-4 | Explorer 20’, on board a Scout X-4 space rocket.
The launch took place on Aug. 25, 1964, 1:43 p.m. from Space Launch Complex 5.
For more information about the launch, click the button.
Scout X-4 | Explorer 20
Agency: N/A
Status: Launch Successful
Launch date: Aug. 25, 1964, 1:43 p.m. UTC
Rocket: Scout X-4
Launch pad: Space Launch Complex 5
Location: Vandenberg SFB, CA, USA
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