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
Country
USRelated business
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 & historyLast TLE update: 13 hours ago
TLE from 13 hours ago
0 OPS 0757 (TACSAT)
1 03691U 69013A 25258.76727012 .00000118 00000-0 00000-0 0 9992
2 03691 2.1480 76.0641 0021857 166.0840 230.8728 1.00420028111356Epoch: 2025-09-15T18:24Z
TLE epoch observation values (Epoch: 2025-09-15T18:24:52.138Z)
Latitude
1.27193°
Longitude
-158.38061°
Altitude
35,802.289 km
Speed
3.072 km/s
True Right ascension
07h 31m 12s
True Declination
1° 16' 14"
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
00:26:58
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
35,838.228 km
Perigee altitude
35,654.086 km
Semi-major axis
42,124.294 km
Eccentricity
0.00219
Inclination
2.148°
RAAN
76.0641°
Arg. of periapsis
166.084°
True anomaly
230.67884°
Mean anomaly
230.8728°
Eccentric anomaly
230.77579°
Mean motion
0.25104 °/min
Orbital period
1,434.03 mins
BSTAR
0
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Other satellites on launch #13 in the year 1969 (1969-02-09 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.OPS 0757 (TACSAT) 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 | 2025-09-16 07:45:23.493Z | 242.429° WSW | 2025-09-16 22:19:23.493Z | 245.615° WSW | 19.842° | 2025-09-17 07:45:23.493Z | 241.962° WSW |
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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
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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