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INTELSAT 4A-F3, 10557

Orbit data source: Space-Track

INTELSAT 4A-F3, 10557 is a payload satellite owned by INTELSAT (US) in GEO that was launched on Sat, 07 Jan 1978 UTC via an ATLAS SLV-3D CENTAUR 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/10557?theme=dark&initialShowStats=false

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Identifier

10557, 1978-002A

Orbit

GEO

Country

US / ITSO

Related business

SES S.A. (LU)

Manufacturer

Hughes

Mission

Non-operational spacecraft

Bus & Motor

HS-353, SVM-4A

Mass

1,515 kg wet, ~630 kg dry

Launch date (UTC)

1978-01-07 (48 years ago)

Launch vehicle

ATLAS SLV-3D CENTAUR

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

Large (>1 m²)

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Last TLE update: 18 hours ago

TLE from 18 hours ago

0 INTELSAT 4A-F3
1 10557U 78002A   26124.89759340 -.00000287  00000-0  00000-0 0  9993
2 10557   9.0749 312.9688 0003507 312.5575 229.8602  0.99911157 48316

Epoch: 2026-05-04T21:32Z

TLE epoch observation values (Epoch: 2026-05-04T21:32:32.069Z)

Latitude

-0.39314°

Longitude

-50.59197°

Altitude

35,897.073 km

Speed

3.07 km/s

True Right ascension

09h 01m 17s

True Declination

0° 23' 34"

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

23:23:10

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

35,903.848 km

Perigee altitude

35,874.202 km

Semi-major axis

42,267.162 km

Eccentricity

0.00035

Inclination

9.0749°

RAAN

312.9688°

Arg. of periapsis

312.5575°

True anomaly

229.82949°

Mean anomaly

229.8602°

Eccentric anomaly

229.84484°

Mean motion

0.24977 °/min

Orbital period

1,441.33 mins

BSTAR

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Other satellites on launch #2 in the year 1978 (1978-01-07 UTC)

ATLAS CENTAUR R/B, 10722

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INTELSAT 4A-F3 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	2026-05-05 15:29:34.185Z	107.724° ESE	2026-05-06 15:14:34.185Z	108.805° ESE	24.118°	2026-05-06 15:29:34.185Z	108.773° ESE

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10557 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 INTELSAT 4A-F3, 10557 on other resources

View INTELSAT 4A-F3, 10557 on NASA - NSSDCA Website

View INTELSAT 4A-F3, 10557 on Heavens-Above

View INTELSAT 4A-F3, 10557 on Keep Track

View INTELSAT 4A-F3, 10557 on Celestrak

View INTELSAT 4A-F3, 10557 on Gunter's Space Page

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

INTELSAT 4A-F3, 10557

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 18 hours ago

TLE from 18 hours ago

TLE epoch observation values (Epoch: 2026-05-04T21:32:32.069Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #2 in the year 1978 (1978-01-07 UTC)

INTELSAT 4A-F3 Visibility forecast

10557 neighbors

Co-orbital & Co-planar RSOs

Check out INTELSAT 4A-F3, 10557 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 18 hours ago