Key statistics
Satellite USA 18 at a glance.
Uptime
14453
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: 103.903 minutes
Inclination: 63.2924 deg
SMA: 7321.13 km
Apoapsis: 1522.368 km
Periapsis: 363.623 km
RAAN: 116.2318 deg
Eccentricy: 0.07913698
Argument of periapsis: 106.9165 deg
Mean anomaly: 262.0121 deg
Mean motion: 13.85911643 rev/day
Mean motion (dot): 0.00023206 rev/day2
B* drag term: 0.0013309008 1/REarth
Two-line elements (TLE)
Creation date: Sept. 3, 2025, 10:15 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Sept. 3, 2025, 1:47 a.m. UTC
TLE line 0: 0 USA 18
TLE line 1: 1 16631U 86014H 25246.07494327 .00023206 00000-0 13309-2 0 9992
TLE line 2: 2 16631 63.2924 116.2318 0791370 106.9165 262.0121 13.85911643304464
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
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