ESSA 8 (TOS-F), 3615
Orbit data source: Space-Track
ESSA 8 (TOS-F), 3615 is a payload satellite owned by ESSA (US) in SSO that was launched on Sun, 15 Dec 1968 UTC via a THOR DELTA N launch vehicle from the Air Force Western Test Range (AFWTR). 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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3615 intel report (Beta)
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Edit Public Description
Identifier
Orbit
Country
USRelated business
Manufacturer
RCA/East Windsor
Mission
Non-operational Civil Weather
Bus & Motor
TIROS I, Unknown motor
Mass
131 kg wet, 131 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl, 0.5 m
Radar Cross Section
0.920 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 16 hours ago
TLE from 16 hours ago
0 ESSA 8 (TOS-F)
1 03615U 68114A 25255.60776821 -.00000024 00000-0 12358-3 0 9990
2 03615 101.6564 202.9451 0032047 141.4870 218.8498 12.56243957601702Epoch: 2025-09-12T14:35Z
TLE epoch observation values (Epoch: 2025-09-12T14:35:11.173Z)
Latitude
-0.0001°
Longitude
-7.70448°
Altitude
1,460.615 km
Speed
7.123 km/s
True Right ascension
13h 31m 46s
True Declination
0° 00' 00"
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
23:15:02
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,461.062 km
Perigee altitude
1,410.977 km
Semi-major axis
7,814.156 km
Eccentricity
0.0032
Inclination
101.6564°
RAAN
202.9451°
Arg. of periapsis
141.487°
True anomaly
218.62016°
Mean anomaly
218.8498°
Eccentric anomaly
218.73491°
Mean motion
3.1421 °/min
Orbital period
114.57 mins
BSTAR
0.00012358
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Other satellites on launch #114 in the year 1968 (1968-12-15 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.ESSA 8 (TOS-F) 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. |
|---|---|---|---|---|---|---|---|
| 14 mins | 2025-09-13 08:25:26.429Z | 36.1° NE | 2025-09-13 08:32:26.429Z | 97.11° ESE | 28.606° | 2025-09-13 08:39:26.429Z | 158.407° S |
| 13 mins | 2025-09-13 10:19:26.429Z | 3.243° NNE | 2025-09-13 10:25:26.429Z | 289.895° WNW | 38.682° | 2025-09-13 10:32:26.429Z | 222.838° SW |
| 13 mins | 2025-09-13 19:23:26.429Z | 126.076° SE | 2025-09-13 19:29:26.429Z | 67.35° ENE | 34.822° | 2025-09-13 19:36:26.429Z | 357.238° N |
| 13 mins | 2025-09-13 21:16:26.429Z | 198.953° SSW | 2025-09-13 21:22:26.429Z | 264.32° W | 33.655° | 2025-09-13 21:29:26.429Z | 327.669° NNW |
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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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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