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USA 28

NORAD 18583 Payload GEO 1987-097A ● Active
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Altitude (km)
Speed (km/s)
Latitude
Longitude
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🛰️ Orbital Parameters
Perigee
36211 km
Apogee
36435 km
Inclination
12.1°
Period
1463.6 min
Mean Motion
0.98388868 rev/day
TLE Epoch
2026-06-19 06:00:00 UTC
📐 Computed Orbital Characteristics
Avg. Altitude36,323 km
Orbital Velocity11,000 km/h
Velocity3.06 km/s
Orbital Period24.4 hours
Orbits / Day0.98
Eccentricity0.0026
Semi-Major Axis42,694 km
Est. Orbital LifetimePermanent — geostationary orbit, no atmospheric drag
🚀 Launch & Identity
Country / Operator
🇺🇸 United States
Launch Date
1987-11-29
Launch Site
Cape Canaveral, Florida
Int'l Designator
1987-097A
Object Type
Payload
RCS Size
Medium (0.1–1 m²)
📖 About This Object
USA 28 is an active satellite operated by United States, launched on 1987-11-29 from Cape Canaveral, Florida. With over 39 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Geostationary Orbit (GEO) at altitudes between 36,211 km and 36,435 km with an inclination of 12.1°. It travels at approximately 11,000 km/h (3.06 km/s), completing one full orbit every 24.4 hours — that’s roughly 0.98 orbits per day. At geostationary altitude, there is no meaningful atmospheric drag — this object will remain in orbit indefinitely unless actively deorbited. Orbital Radar tracks USA 28 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.
🌍 Orbit Context
USA 28 occupies geostationary orbit at approximately 35,786 km above the equator, where its orbital period matches the Earth’s 24-hour rotation. From the ground, it appears to hover over a fixed point — ideal for broadcast television, weather monitoring and wideband communications. With an inclination of 12.1°, it traces a small figure-of-eight pattern relative to the equator rather than remaining perfectly stationary, which can indicate aging stationkeeping fuel or a deliberate inclined-orbit strategy. Within ±50 km of USA 28’s average altitude, there are currently 44 active payloads and 8 tracked debris or rocket body fragments. United States operates approximately 12,339 active satellites in total, of which 12 share a similar altitude band with USA 28.
❓ Frequently Asked Questions
USA 28 orbits at approximately 36,323 km altitude, where the orbital period matches the Earth’s 24-hour rotation. This means it stays above the same point on the equator at all times. Its actual speed is still 11,000 km/h — it just keeps pace with the ground below. With an inclination of 12.1°, it actually traces a small figure-of-eight pattern rather than remaining perfectly fixed. Learn more about geostationary orbits.
USA 28 is operated by United States. It is catalogued by the U.S. Space Surveillance Network under NORAD ID 18583. You can track USA 28 in real time on Orbital Radar’s live tracker or browse all operators in the operator directory.
USA 28 was launched on 1987-11-29 from Cape Canaveral, Florida, one of the busiest launch facilities in the world, operated by NASA and the U.S. Space Force on Florida’s Atlantic coast. View the full satellite launch log.
Yes — Orbital Radar tracks USA 28 (NORAD ID 18583) using the latest TLE (two-line element set) data from Space-Track and CelesTrak. Open the live tracker to see its current position, altitude, speed and orbital path updated in real time. You can also browse the satellite directory to find other tracked objects.
USA 28 travels at approximately 11,000 km/h (6,835 mph) — roughly 3.06 km/s. Despite this high speed, it appears stationary from the ground because it matches the Earth’s rotation. Geostationary satellites are actually slower than LEO satellites because orbital velocity decreases with altitude.