Key statistics
Satellite STEX at a glance.
Uptime
9835
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: 99.212 minutes
Inclination: 84.9864 deg
SMA: 7099.105 km
Apoapsis: 726.044 km
Periapsis: 715.897 km
RAAN: 146.1787 deg
Eccentricy: 0.00071465
Argument of periapsis: 291.5202 deg
Mean anomaly: 68.5239 deg
Mean motion: 14.51434093 rev/day
Mean motion (dot): 0.00000949 rev/day2
B* drag term: 0.00023274759 1/REarth
Two-line elements (TLE)
Creation date: Sept. 4, 2025, 10:13 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Sept. 4, 2025, 4:35 a.m. UTC
TLE line 0: 0 STEX
TLE line 1: 1 25489U 98055A 25247.19129079 .00000949 00000-0 23275-3 0 9997
TLE line 2: 2 25489 84.9864 146.1787 0007147 291.5202 68.5239 14.51434093421849
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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