Key statistics
Satellite USA 18 at a glance.
Uptime
14553
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 USA 18.
Object identification
Identified? True
Debris? False
Object name: USA 18
International designator: 1986-014H
Object number (NORAD): 16631
Object ID (CCSDS): 16631
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 103.703 minutes
Inclination: 63.2914 deg
SMA: 7311.762 km
Apoapsis: 1501.563 km
Periapsis: 365.691 km
RAAN: 196.1279 deg
Eccentricy: 0.0776743
Argument of periapsis: 108.8852 deg
Mean anomaly: 259.7996 deg
Mean motion: 13.88576228 rev/day
Mean motion (dot): 0.00014961 rev/day2
B* drag term: 0.00087593 1/REarth
Two-line elements (TLE)
Creation date: Dec. 12, 2025, 7:16 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 11, 2025, 11:26 p.m. UTC
TLE line 0: 0 USA 18
TLE line 1: 1 16631U 86014H 25345.97677859 .00014961 00000-0 87593-3 0 9999
TLE line 2: 2 16631 63.2914 196.1279 0776743 108.8852 259.7996 13.88576228318329
Live tracking on map
Real-time ground track for satellite USA 18.
In-orbit conjunctions
There are no conjunctions computed for USA 18, at the moment. Check back to stay up to date, as we update our databases every day.
Go to all conjunctionsAssociated space launch
The Parcae satellites were passive ELINT satellites. MSD satellites were dispensers of triplets of ocean surveillance satellites.
USA 18 was lifted into orbit during the mission ‘Atlas H | Parcae 8A,B,C & MSD 8’, on board a Atlas H space rocket.
The launch took place on Feb. 9, 1986, 10:06 a.m. from Space Launch Complex 3E.
For more information about the launch, click the button.
Atlas H | Parcae 8A,B,C & MSD 8
Agency: N/A
Status: Launch Successful
Launch date: Feb. 9, 1986, 10:06 a.m. UTC
Rocket: Atlas H
Launch pad: Space Launch Complex 3E
Location: Vandenberg SFB, CA, USA
...
Latest news about this satellite
There are no fresh news available about this satellite. Check back as we update our databases every day.
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