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SYNCOM 3, 858

Orbit data source: Space-Track

SYNCOM 3, 858 is a payload satellite owned by GSFC (US) in GEO that was launched on Wed, 19 Aug 1964 UTC via a THOR DELTA D launch vehicle from the Air Force Eastern Test Range (AFETR). Payloads include a variety of satellites, spacecraft, and rockets 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.

Not visible in the next 10 days

Identifier	858, 1964-047A
Orbit	GEO
Last TLE update	20 hours ago
Origin	GSFC (US)
Manufacturer	Hughes
Mission	Non-operational Civil Communications
Bus & Motor	HS-301, SR-12-1
Mass	66 kg wet, 33 kg dry
Launch date (UTC)	1964-08-19 (61 years ago)
Launch vehicle	THOR DELTA D
Launch site	Air Force Eastern Test Range (AFETR)
Object type	Payload Rocket body Debris
Shape & HBR	Cyl, 0.71 m
Radar Cross Section	0.415 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 20 hours ago

0 SYNCOM 3
1 00858U 64047A   25082.81958699 -.00000223  00000-0  00000-0 0  9992
2 00858   5.8635  69.0047 0002952 173.5736 200.9699  1.00330435 48956

Epoch: 2025-03-23T19:40Z

Definitive object data (Epoch: 2025-03-23T19:40:12.315Z)

Latitude	1.45265°
Longitude	-33.12992°
Altitude	35,781.06 km
Speed	3.074 km/s
True Right ascension	05h 33m 51s
True Declination	1° 27' 04"
Sunlit	Object was in daylight at TLE epoch

Visualization TLE readout

Latitude	-3.68734°
Longitude	-86.31498°
Altitude	35,780.789 km
Speed	3.075 km/s
Apparent Right ascension	02h 27m 22s
Apparent Declination	-9° 25' 15"
Sunlit	Object is in daylight

Visualization observer readout

Local Sidereal Time	21:11:27
Azimuth	104.285° ESE
Elevation	2.271°
Doppler factor	1

Orbital elements

Apogee altitude	35,783.658 km
Perigee altitude	35,758.773 km
Semi-major axis	42,149.353 km
Eccentricity	0.0002952
Inclination	5.8635°
RAAN	69.0047°
Arg. of periapsis	173.5736°
True anomaly	200.9578°
Mean anomaly	200.9699°
Eccentric anomaly	200.96385°
Mean motion	0.25082 °/min
BSTAR	Unknown
Orbital period	1435.31 mins