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 spacecraft
Bus & Motor
HS-308, Unknown motor
Mass
721 kg wet, ~650 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Medium (>0.1 m² and <1 m²)
Expand to show TLE details & historyLast TLE update: 8 hours ago
TLE from 8 hours ago
0 OPS 0757 (TACSAT)
1 3691U 69013A 26035.11509764 -.00000276 00000-0 00000+0 0 9992
2 3691 2.5110 75.4003 0022742 179.9387 207.5168 1.00436769112773Epoch: 2026-02-04T02:45Z
TLE epoch observation values (Epoch: 2026-02-04T02:45:44.436Z)
Latitude
1.15501°
Longitude
-72.974°
Altitude
35,824.651 km
Speed
3.07 km/s
True Right ascension
06h 50m 59s
True Declination
1° 09' 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
13:04:23
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
35,837.264 km
Perigee altitude
35,645.687 km
Semi-major axis
42,119.613 km
Eccentricity
0.00227
Inclination
2.511°
RAAN
75.4003°
Arg. of periapsis
179.9387°
True anomaly
207.3967°
Mean anomaly
207.5168°
Eccentric anomaly
207.45672°
Mean motion
0.25108 °/min
Orbital period
1,433.79 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 | 2026-02-04 11:06:21.315Z | 134.475° SE | 2026-02-05 06:47:21.315Z | 133.096° SE | 29.963° | 2026-02-05 11:06:21.315Z | 133.859° SE |
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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 descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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