Key statistics
Satellite STEX at a glance.
Uptime
9934
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: 99.2 minutes
Inclination: 84.9829 deg
SMA: 7098.505 km
Apoapsis: 725.883 km
Periapsis: 714.858 km
RAAN: 86.9208 deg
Eccentricy: 0.00077659
Argument of periapsis: 328.9848 deg
Mean anomaly: 31.0896 deg
Mean motion: 14.5161812 rev/day
Mean motion (dot): 0.0000107 rev/day2
B* drag term: 0.00026188078 1/REarth
Two-line elements (TLE)
Creation date: Dec. 12, 2025, 10:14 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 12, 2025, 6:05 a.m. UTC
TLE line 0: 0 STEX
TLE line 1: 1 25489U 98055A 25346.25349829 .00001070 00000-0 26188-3 0 9993
TLE line 2: 2 25489 84.9829 86.9208 0007766 328.9848 31.0896 14.51618120436213
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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