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TDRS 12

NORAD 39504 Payload GEO 2014-004A ● Active
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Altitude (km)
Speed (km/s)
Latitude
Longitude
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🛰️ Orbital Parameters
Perigee
35775 km
Apogee
35801 km
Inclination
4.0°
Period
1436.2 min
Mean Motion
1.00266206 rev/day
TLE Epoch
2026-06-19 01:00:00 UTC
📐 Computed Orbital Characteristics
Avg. Altitude35,788 km
Orbital Velocity11,069 km/h
Velocity3.07 km/s
Orbital Period~24 hours (geosynchronous)
Orbits / Day1.00
Eccentricity0.0003
Semi-Major Axis42,159 km
Est. Orbital LifetimePermanent — geostationary orbit, no atmospheric drag
🚀 Launch & Identity
Country / Operator
🇺🇸 National Aeronautics and Space Administration (NASA) (United States)
Launch Date
2014-01-24
Launch Site
Cape Canaveral, Florida
Int'l Designator
2014-004A
Object Type
Payload
RCS Size
Large (>1 m²)
📖 About This Object
TDRS 12 is an active satellite operated by National Aeronautics and Space Administration (NASA) (United States), launched on 2014-01-24 from Cape Canaveral, Florida. After 12 years in orbit, it continues to be tracked by global surveillance networks. It orbits in Geostationary Orbit (GEO) at altitudes between 35,775 km and 35,801 km with an inclination of 4.0°. It travels at approximately 11,069 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 12 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 12 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 4.0°, 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 12’s average altitude, there are currently 714 active payloads and 60 tracked debris or rocket body fragments — notable neighbours include ASTRA 1N, GOES 16, TDRS 13. United States operates approximately 12,339 active satellites in total, of which 146 share a similar altitude band with TDRS 12.
🔗 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 12 orbits at approximately 35,788 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 11,069 km/h — it just keeps pace with the ground below. With an inclination of 4.0°, it actually traces a small figure-of-eight pattern rather than remaining perfectly fixed. Learn more about geostationary orbits.
TDRS 12 is operated by National Aeronautics and Space Administration (NASA) (United States). It is catalogued by the U.S. Space Surveillance Network under NORAD ID 39504. You can track TDRS 12 in real time on Orbital Radar’s live tracker or browse all operators in the operator directory.
TDRS 12 was launched on 2014-01-24 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 12 (NORAD ID 39504) 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 12 travels at approximately 11,069 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.