Key statistics
Satellite STEX at a glance.
Uptime
9882
Days in orbit
Revolutions
≈ 14.5
Per day
Orbit
LEO
Low Earth Orbit
Inclination
85.0
Latest
Satellite identification and parameters
Extended collection of information and parameters for STEX.
Object identification
Identified? True
Debris? False
Object name: STEX
International designator: 1998-055A
Object number (NORAD): 25489
Object ID (CCSDS): 25489
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 99.207 minutes
Inclination: 84.9792 deg
SMA: 7098.848 km
Apoapsis: 728.253 km
Periapsis: 713.172 km
RAAN: 117.0301 deg
Eccentricy: 0.00106225
Argument of periapsis: 118.6697 deg
Mean anomaly: 241.5575 deg
Mean motion: 14.51513171 rev/day
Mean motion (dot): 0.00000982 rev/day2
B* drag term: 0.00024036573 1/REarth
Two-line elements (TLE)
Creation date: Oct. 23, 2025, 2:46 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 22, 2025, 10:21 p.m. UTC
TLE line 0: 0 STEX
TLE line 1: 1 25489U 98055A 25295.93127713 .00000982 00000-0 24037-3 0 9999
TLE line 2: 2 25489 84.9792 117.0301 0010622 118.6697 241.5575 14.51513171428913
Live tracking on map
Real-time ground track for satellite STEX.
In-orbit conjunctions
A list of the most updated potential collisions computed for object STEX.
Associated space launch
The STEX (Space Technology Experiments) satellite carried 29 new technologies intended to result in lower cost and higher performance spacecraft for future missions.
STEX was lifted into orbit during the mission ‘Minotaur | NROL-8’, on board a Minotaur space rocket.
The launch took place on Oct. 3, 1998, 10:04 a.m. from Space Launch Complex 576E.
For more information about the launch, click the button.
Minotaur | NROL-8
Agency: N/A
Status: Launch Successful
Launch date: Oct. 3, 1998, 10:04 a.m. UTC
Rocket: Minotaur
Launch pad: Space Launch Complex 576E
Location: Vandenberg SFB, CA, USA
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