Key statistics
Satellite DELTA 1 R/B at a glance.
Uptime
20981
Days in orbit
Revolutions
≈ 9.3
Per day
Orbit
HEO
HEO
Inclination
120.7
Latest
Satellite identification and parameters
Extended collection of information and parameters for DELTA 1 R/B.
Object identification
Identified? True
Debris? False
Object name: DELTA 1 R/B
International designator: 1968-055B
Object number (NORAD): 3315
Object ID (CCSDS): 3315
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 155.556 minutes
Inclination: 120.6868 deg
SMA: 9581.139 km
Apoapsis: 5729.67 km
Periapsis: 676.338 km
RAAN: 319.9848 deg
Eccentricy: 0.2637125
Argument of periapsis: 170.9199 deg
Mean anomaly: 0.925 deg
Mean motion: 9.25714509 rev/day
Mean motion (dot): 0.00000022 rev/day2
B* drag term: 0.00015278057 1/REarth
Two-line elements (TLE)
Creation date: Dec. 11, 2025, 3:54 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 10, 2025, 5:54 p.m. UTC
TLE line 0: 0 DELTA 1 R/B
TLE line 1: 1 03315U 68055B 25344.74642124 .00000022 00000-0 15278-3 0 9994
TLE line 2: 2 03315 120.6868 319.9848 2637125 170.9199 0.9250 9.25714509924103
Live tracking on map
Real-time ground track for satellite DELTA 1 R/B.
Associated space launch
The RAE A (Radio Astronomy Explorer A) spacecraft measured the intensity of celestial radio sources, particularly the sun, as a function of time, direction, and frequency (0.2 to 20 MHz).
DELTA 1 R/B was lifted into orbit during the mission ‘Thor Delta J | RAE 1’, on board a Thor Delta J space rocket.
The launch took place on July 4, 1968, 5:26 p.m. from Space Launch Complex 2E.
For more information about the launch, click the button.
Thor Delta J | RAE 1
Agency: N/A
Status: Launch Successful
Launch date: July 4, 1968, 5:26 p.m. UTC
Rocket: Thor Delta J
Launch pad: Space Launch Complex 2E
Location: Vandenberg SFB, CA, USA
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