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USA 8, 15543

Orbit data source: Space-Track

USA 8, 15543 is an American payload satellite in GEO that was launched on Thu, 24 Jan 1985 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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<iframe src="https://www.satcat.com/sats-embedded/15543?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/15543?theme=dark&initialShowStats=false

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Identifier

15543, 1985-010B

Orbit

GEO

Country

Related business

National Reconnaissance Office (US)

Manufacturer

TRW

Mission

Spacecraft

Bus & Motor

MAGNUM, MMBPS?

Mass

~2,715 kg wet, ~2,600 kg dry

Launch date (UTC)

1985-01-24 (41 years ago)

Launch vehicle

SPACE SHUTTLE

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

RCS unknown

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Last TLE update: 5 days ago

TLE from 5 days ago

0 USA 8
1 15543U 85010B   26155.04072677  .00000025  00000-0  00000-0 0  9991
2 15543  12.6793 313.6675 0131148  56.5846 128.3460  0.99809331  7699

Epoch: 2026-06-04T00:58Z

TLE epoch observation values (Epoch: 2026-06-04T00:58:38.792Z)

Latitude

-1.34256°

Longitude

-127.53831°

Altitude

36,262.123 km

Speed

3.045 km/s

True Right ascension

09h 18m 27s

True Declination

-1° 20' 28"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

14:33:04

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

36,472.432 km

Perigee altitude

35,363.028 km

Semi-major axis

42,295.867 km

Eccentricity

0.01311

Inclination

12.6793°

RAAN

313.6675°

Arg. of periapsis

56.5846°

True anomaly

129.5127°

Mean anomaly

128.346°

Eccentric anomaly

128.93054°

Mean motion

0.24951 °/min

Orbital period

1,442.8 mins

BSTAR

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Other satellites on launch #10 in the year 1985 (1985-01-24 UTC)

STS 51C, 15496 (Decayed)

IUS R/B(1), 15544

IUS R/B(2), 15545

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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

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USA 8 Visibility forecast

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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.
1440 mins	2026-06-09 04:23:18.517Z	218.508° SW	2026-06-09 19:27:18.517Z	234.596° WSW	35.083°	2026-06-10 04:23:18.517Z	220.209° SW

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15543 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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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

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Check out USA 8, 15543 on other resources

View USA 8, 15543 on NASA - NSSDCA Website

View USA 8, 15543 on Heavens-Above

View USA 8, 15543 on Keep Track

View USA 8, 15543 on Celestrak

View USA 8, 15543 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

USA 8, 15543

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 5 days ago

TLE from 5 days ago

TLE epoch observation values (Epoch: 2026-06-04T00:58:38.792Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #10 in the year 1985 (1985-01-24 UTC)

USA 8 Visibility forecast

15543 neighbors

Co-orbital & Co-planar RSOs

Check out USA 8, 15543 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 5 days ago