USA 99 (MILSTAR-1 1)
Launch
Launched on Feb 7, 1994 from Space Launch Complex 40, United States of America aboard a Titan 401A Centaur.
Titan 401A Centaur | Milstar 1 →Live · TLE epoch 2026-07-13 04:27 UTC
Orbit class
IGSO — Inclined Geosynchronous (BeiDou / QZSS, figure-8 ground track)
Operator
United States Government (classified)
Country
United States
Manufacturer
—
Launched
Feb 7, 1994
Mass
—
Apogee
36,242 km
Perigee
36,228 km
Inclination
17.66°
Period
1.01 d
Altitude history
Apogee and perigee for USA 99 (MILSTAR-1 1) across 46 days of archived orbital elements (48 element sets, one per day).
Trend
Stable
Change
+0.6 km
Rate
+0.01 km/day
Now
36228 × 36242 km
Apogee Perigee
Derived from our own archive of CelesTrak orbital elements, sampled every 3 hours. Short windows show drag and station-keeping; they are not a reentry prediction.
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