OPS 0757 (TACSAT), 3691
Orbit data source: Space-Track
OPS 0757 (TACSAT), 3691 is a payload satellite owned by SAMSO (US) in GEO that was launched on Sun, 09 Feb 1969 UTC via a TITAN IIIC 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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3691 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Last TLE update
12 hours ago
Origin
Manufacturer
Hughes
Mission
Non-operational Defense Communications
Bus & Motor
HS-308, Unknown motor
Mass
721 kg wet, ~650 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl, 3.8 m
Radar Cross Section
19.792 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & history
TLE from 12 hours ago
0 OPS 0757 (TACSAT)
1 03691U 69013A 25199.48517027 .00000026 00000-0 00000-0 0 9996
2 03691 2.0004 76.3325 0019378 164.9247 42.6382 1.00399221110750Epoch: 2025-07-18T11:38Z
TLE epoch observation values (Epoch: 2025-07-18T11:38:38.711Z)
Latitude
-0.94625°
Longitude
172.83938°
Altitude
35,690.394 km
Speed
3.08 km/s
True Right ascension
18h 56m 08s
True Declination
0° 56' 43"
Sunlit
Visualization orbit readout
Latitude
0.80524°
Longitude
-11.64939°
Altitude
35,814.426 km
Speed
3.071 km/s
Apparent Right ascension
06h 11m 31s
Apparent Declination
-4° 45' 26"
Sunlit
Visualization observer readout
Local Sidereal Time
12:06:36
Azimuth
265.562° W
Elevation
-2.11°
Doppler factor
1
Orbital elements
Apogee altitude
35,833.617 km
Perigee altitude
35,670.337 km
Semi-major axis
42,130.114 km
Eccentricity
0.00194
Inclination
2.0004°
RAAN
76.3325°
Arg. of periapsis
164.9247°
True anomaly
42.78888°
Mean anomaly
42.6382°
Eccentric anomaly
42.71351°
Mean motion
0.25099 °/min
Orbital period
1,434.33 mins
BSTAR
0
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Other satellites on launch #13 in the year 1969 (1969-02-09 UTC)
OPS 0757 (TACSAT) Visibility
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. |
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3691 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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