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TDRS 5, 21639

Orbit data source: Space-Track

TDRS 5, 21639 is a payload satellite owned by GSFC (US) in GEO that was launched on Fri, 02 Aug 1991 UTC via an SPACE SHUTTLE launch vehicle from the Air Force Eastern Test Range (AFETR). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.

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https://www.satcat.com/sats-embedded/21639?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21639, 1991-054B

Orbit

GEO

Last TLE update

6 hours ago

Origin

National Aeronautics and Space Administration (NASA) (US)

Manufacturer

TRW

Mission

Operational Civil Communications

Bus & Motor

TDRS, AOCS

Mass

2,534 kg wet, ~1,700 kg dry

Launch date (UTC)

1991-08-02 (34 years ago)

Launch vehicle

SPACE SHUTTLE

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Hex Cyl + 2 Pan, 8.7 m

Radar Cross Section

13.873 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 6 hours ago

0 TDRS 5
1 21639U 91054B   25214.08519876  .00000090  00000-0  00000+0 0  9996
2 21639  14.1093 356.1200 0010096 240.5604 297.4167  1.00277919124509

Epoch: 2025-08-02T02:02Z

TLE epoch observation values (Epoch: 2025-08-02T02:02:41.172Z)

Latitude

0.52544°

Longitude

-167.53839°

Altitude

35,764.97 km

Speed

3.076 km/s

True Right ascension

11h 36m 14s

True Declination

0° 31' 30"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

-14.08034°

Longitude

-70.75638°

Altitude

35,752.195 km

Speed

3.077 km/s

Apparent Right ascension

17h 37m 44s

Apparent Declination

-20° 14' 05"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

22:12:04

Azimuth

240.955° WSW

Elevation

2.34°

Doppler factor

Orbital elements

Apogee altitude

35,828.422 km

Perigee altitude

35,743.284 km

Semi-major axis

42,163.99 km

Eccentricity

0.00101

Inclination

14.1093°

RAAN

356.12°

Arg. of periapsis

240.5604°

True anomaly

297.31394°

Mean anomaly

297.4167°

Eccentric anomaly

297.36533°

Mean motion

0.25069 °/min

Orbital period

1,436.06 mins

BSTAR

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Other satellites on launch #54 in the year 1991 (1991-08-02 UTC)

STS 43, 21638 (Decayed)

IUS R/B(1), 21640

IUS R/B(2), 21641

IUS DEB, 21642 (Decayed)

TDRS 5 Visibility forecast

Observer location: undefined°, undefined°

Span	Click to sort rows by Start time (UTC) header in descending order	Start Az.	Max El. time (UTC)	Max El. Az.	Max El.	End time (UTC)	End Az.
821 mins	2025-08-02 13:08:47.448Z	248.295° W	2025-08-02 20:41:47.448Z	263.004° W	20.612°	2025-08-03 02:49:47.448Z	249.748° W

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21639 neighbors

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Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

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Check out TDRS 5, 21639 on other resources

View TDRS 5, 21639 on NASA - NSSDCA Website

View TDRS 5, 21639 on Heavens-Above

View TDRS 5, 21639 on Keep Track

View TDRS 5, 21639 on Celestrak

View TDRS 5, 21639 on Gunter's Space Page

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