Key statistics
Satellite SS 2 at a glance.
Uptime
17488
Days in orbit
Revolutions
≈ 13.9
Per day
Orbit
LEO
Low Earth Orbit
Inclination
63.3
Latest
Satellite identification and parameters
Extended collection of information and parameters for SS 2.
Object identification
Identified? True
Debris? False
Object name: SS 2
International designator: 1977-112E
Object number (NORAD): 10544
Object ID (CCSDS): 10544
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 103.536 minutes
Inclination: 63.3341 deg
SMA: 7303.913 km
Apoapsis: 1318.238 km
Periapsis: 533.319 km
RAAN: 281.8914 deg
Eccentricy: 0.05373278
Argument of periapsis: 158.9891 deg
Mean anomaly: 203.4184 deg
Mean motion: 13.90814911 rev/day
Mean motion (dot): 0.00000501 rev/day2
B* drag term: 0.0001552875 1/REarth
Two-line elements (TLE)
Creation date: Oct. 25, 2025, 3:11 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 24, 2025, 11:06 p.m. UTC
TLE line 0: 0 SS 2
TLE line 1: 1 10544U 77112E 25297.96288647 .00000501 00000-0 15529-3 0 9998
TLE line 2: 2 10544 63.3341 281.8914 0537328 158.9891 203.4184 13.90814911319673
Live tracking on map
Real-time ground track for satellite SS 2.
In-orbit conjunctions
A list of the most updated potential collisions computed for object SS 2.
Associated space launch
The Parcae satellites were passive ELINT satellites. MSD satellites were dispensers of triplets of ocean surveillance satellites.
SS 2 was lifted into orbit during the mission ‘Atlas F/MSD | Parcae 2A,B,C & MSD 2’, on board a Atlas F/MSD space rocket.
The launch took place on Dec. 8, 1977, 5:45 p.m. from Space Launch Complex 3W.
For more information about the launch, click the button.
Atlas F/MSD | Parcae 2A,B,C & MSD 2
Agency: N/A
Status: Launch Successful
Launch date: Dec. 8, 1977, 5:45 p.m. UTC
Rocket: Atlas F/MSD
Launch pad: Space Launch Complex 3W
Location: Vandenberg SFB, CA, USA
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