TDRS 5
NORAD 21639
Payload
GEO
1991-054B
● Active
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GEO · NORAD 21639
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Altitude (km)
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Speed (km/s)
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Latitude
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Longitude
🛰️ Orbital Parameters
Perigee
35759 km
Apogee
35812 km
Inclination
14.1°
Period
1436.0 min
Mean Motion
1.00275601 rev/day
TLE Epoch
2026-06-19 17:00:00 UTC
📐 Computed Orbital Characteristics
Avg. Altitude35,786 km
Orbital Velocity11,070 km/h
Velocity3.07 km/s
Orbital Period~24 hours (geosynchronous)
Orbits / Day1.00
Eccentricity0.0006
Semi-Major Axis42,157 km
Est. Orbital LifetimePermanent — geostationary orbit, no atmospheric drag
🚀 Launch & Identity
Country / Operator
🇺🇸 SES S.A. (United States)
Launch Date
1991-08-02
Launch Site
Cape Canaveral, Florida
Int'l Designator
1991-054B
Object Type
Payload
RCS Size
Large (>1 m²)
📖 About This Object
TDRS 5 is an active satellite operated by SES S.A. (United States), launched on 1991-08-02 from Cape Canaveral, Florida. With over 35 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Geostationary Orbit (GEO) at altitudes between 35,759 km and 35,812 km with an inclination of 14.1°. It travels at approximately 11,070 km/h (3.07 km/s), completing one full orbit every ~24 hours (geosynchronous) — that’s roughly 1.00 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 TDRS 5 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.
🌍 Orbit Context
TDRS 5 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 14.1°, 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 TDRS 5’s average altitude, there are currently 713 active payloads and 58 tracked debris or rocket body fragments — notable neighbours include ASTRA 1N, GOES 16, TDRS 13. United States operates approximately 12,360 active satellites in total, of which 146 share a similar altitude band with TDRS 5.
🔗 Tracking and Data Relay Satellite System
This satellite is part of NASA's Tracking and Data Relay Satellite System (TDRSS), a network of GEO communications satellites that provides continuous high-bandwidth contact with the ISS, Hubble, scientific spacecraft and launch vehicles. TDRS eliminates coverage gaps that would exist with ground stations alone, enabling near-global real-time telemetry and command relay.
❓ Frequently Asked Questions
TDRS 5 orbits at approximately 35,786 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 11,070 km/h — it just keeps pace with the ground below. With an inclination of 14.1°, it actually traces a small figure-of-eight pattern rather than remaining perfectly fixed. Learn more about geostationary orbits.
TDRS 5 is operated by SES S.A. (United States). It is catalogued by the U.S. Space Surveillance Network under NORAD ID 21639. You can track TDRS 5 in real time on Orbital Radar’s live tracker or browse all operators in the operator directory.
TDRS 5 was launched on 1991-08-02 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 TDRS 5 (NORAD ID 21639) 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.
TDRS 5 travels at approximately 11,070 km/h (6,878 mph) — roughly 3.07 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.