ISS (UNITY)
NORAD 25575· COSPAR 1998-069F· ISS / Science· LEO
Launch
Launched on Dec 4, 1998 from Launch Complex 39A, United States of America aboard a Space Shuttle.
Space Shuttle Endeavour / OV-105 | STS-88 →Live · TLE epoch 2026-10-23 16:37 UTC
Orbit class
LEO — Low Earth Orbit (circular, < 2,000 km)
Operator
—
Country
International Space Station
Manufacturer
—
Launched
Dec 4, 1998
Mass
—
Apogee
432 km
Perigee
423 km
Inclination
51.63°
Period
1.55 h
Altitude history
Apogee and perigee for ISS (UNITY) across 59 days of archived orbital elements (60 element sets, one per day).
Trend
Raising
Change
+1.8 km
Rate
+0.03 km/day
Now
423 × 432 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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