SBIRS GEO-4 (USA 273)
Launch
Launched on Jan 21, 2017 from Space Launch Complex 41, United States of America aboard a Atlas V 401.
Atlas V 401 | SBIRS GEO Flight 3 (SBIRS GEO-4) →
Live · TLE epoch 2026-10-23 15:07 UTC
Orbit class
GEO — Geostationary (~35,786 km, equatorial)
Operator
United States Air Force
Country
United States
Manufacturer
—
Launched
Jan 21, 2017
Mass
—
Apogee
35,803 km
Perigee
35,787 km
Inclination
2.50°
Period
23.94 h
Summary from Wikipedia (CC-BY-SA 4.0)
USA-273, also known as SBIRS GEO-3, is a United States military satellite and part of the Space-Based Infrared System (SBIRS).
Full article on Wikipedia →Altitude history
Apogee and perigee for SBIRS GEO-4 (USA 273) across 148 days of archived orbital elements (150 element sets, one per day).
Trend
Stable
Change
+0.3 km
Rate
+0.00 km/day
Now
35787 × 35803 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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