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). 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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858 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
Hughes
Mission
Non-operational spacecraft
Bus & Motor
HS-301, SR-12-1
Mass
66 kg wet, 33 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 SYNCOM 3
1 00858U 64047A 25295.05045044 .00000025 00000-0 00000-0 0 9994
2 00858 6.3823 66.9173 0010849 257.2974 86.4041 1.00320753 51072Epoch: 2025-10-22T01:12Z
TLE epoch observation values (Epoch: 2025-10-22T01:12:38.918Z)
Latitude
-1.77052°
Longitude
1.91344°
Altitude
35,769.581 km
Speed
3.075 km/s
True Right ascension
03h 23m 13s
True Declination
-1° 46' 07"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
21:27:42
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
35,819.655 km
Perigee altitude
35,728.194 km
Semi-major axis
42,152.061 km
Eccentricity
0.00108
Inclination
6.3823°
RAAN
66.9173°
Arg. of periapsis
257.2974°
True anomaly
86.52819°
Mean anomaly
86.4041°
Eccentric anomaly
86.46614°
Mean motion
0.25079 °/min
Orbital period
1,435.45 mins
BSTAR
0
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Other satellites on launch #47 in the year 1964 (1964-08-19 UTC)
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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.SYNCOM 3 Visibility
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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. |
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| SYNCOM 3 is likely not visible in the next few days. |
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858 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
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in ascending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in ascending order |
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