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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Identifier
Orbit
Country
USRelated business
Manufacturer
RCA/East Windsor
Mission
Non-operational spacecraft
Bus & Motor
TIROS I, Unknown motor
Mass
131 kg wet, 131 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: 2 days ago
TLE from 2 days ago
0 ESSA 8 (TOS-F)
1 3615U 68114A 26171.40557506 -.00000028 00000-0 10617-3 0 9993
2 3615 101.7003 120.7368 0031703 316.9920 42.8677 12.56249791636960Epoch: 2026-06-20T09:44Z
TLE epoch observation values (Epoch: 2026-06-20T09:44:01.685Z)
Latitude
0.00001°
Longitude
66.10911°
Altitude
1,422.916 km
Speed
7.158 km/s
True Right ascension
08h 02m 56s
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
23:27:21
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,460.771 km
Perigee altitude
1,411.225 km
Semi-major axis
7,814.135 km
Eccentricity
0.00317
Inclination
101.7003°
RAAN
120.7368°
Arg. of periapsis
316.992°
True anomaly
43.11557°
Mean anomaly
42.8677°
Eccentric anomaly
42.99156°
Mean motion
3.14211 °/min
Orbital period
114.57 mins
BSTAR
0.00010617
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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 | 2026-06-22 19:12:01.752Z | 121.22° SE | 2026-06-22 19:19:01.752Z | 60.067° ENE | 30.722° | 2026-06-22 19:26:01.752Z | 358.749° N |
| 14 mins | 2026-06-22 21:05:01.752Z | 187.885° SSW | 2026-06-22 21:11:01.752Z | 252.252° W | 38.075° | 2026-06-22 21:19:01.752Z | 332.524° NNW |
| 15 mins | 2026-06-23 09:05:01.752Z | 28.231° NE | 2026-06-23 09:12:01.752Z | 103.14° ESE | 39.72° | 2026-06-23 09:20:01.752Z | 179.738° S |
| 13 mins | 2026-06-23 10:58:01.752Z | 356.945° N | 2026-06-23 11:04:01.752Z | 302.604° NW | 29.5° | 2026-06-23 11:11:01.752Z | 241.968° WSW |
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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