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.
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
3615 intel report (Beta)
Focus sentinelFocus sentinel
Create New Watchlist
Focus sentinelFocus sentinel
Edit Public Description
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: 1 day ago
TLE from 1 day ago
0 ESSA 8 (TOS-F)
1 03615U 68114A 25301.47845572 -.00000012 00000-0 19862-3 0 9991
2 03615 101.6671 248.2483 0032255 53.0461 307.3560 12.56245493607464Epoch: 2025-10-28T11:28Z
TLE epoch observation values (Epoch: 2025-10-28T11:28:58.574Z)
Latitude
0.00003°
Longitude
38.93887°
Altitude
1,425.815 km
Speed
7.155 km/s
True Right ascension
16h 32m 59s
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
07:24:20
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,461.218 km
Perigee altitude
1,410.809 km
Semi-major axis
7,814.151 km
Eccentricity
0.00323
Inclination
101.6671°
RAAN
248.2483°
Arg. of periapsis
53.0461°
True anomaly
307.06148°
Mean anomaly
307.356°
Eccentric anomaly
307.20881°
Mean motion
3.1421 °/min
Orbital period
114.57 mins
BSTAR
0.00019862
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Other satellites on launch #114 in the year 1968 (1968-12-15 UTC)
Did you know?
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
Loading observer location...
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. |
|---|---|---|---|---|---|---|---|
| 8 mins | 2025-10-29 18:16:32.922Z | 80.736° E | 2025-10-29 18:20:32.922Z | 48.758° ENE | 16.356° | 2025-10-29 18:24:32.922Z | 17.199° NNE |
| 14 mins | 2025-10-29 20:05:32.922Z | 151.323° SSE | 2025-10-29 20:11:32.922Z | 79.419° E | 44.13° | 2025-10-29 20:19:32.922Z | 346.082° N |
| 10 mins | 2025-10-29 22:00:32.922Z | 228.767° WSW | 2025-10-29 22:04:32.922Z | 263.012° W | 20.099° | 2025-10-29 22:10:32.922Z | 312.443° NW |
| 11 mins | 2025-10-30 08:06:32.922Z | 49.428° ENE | 2025-10-30 08:11:32.922Z | 92.29° ESE | 22.321° | 2025-10-30 08:17:32.922Z | 142.515° SSE |
| 14 mins | 2025-10-30 09:58:32.922Z | 10.764° NNE | 2025-10-30 10:04:32.922Z | 306.434° NW | 43.226° | 2025-10-30 10:12:32.922Z | 210.755° SW |
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 |
|---|
CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
Authenticating...
Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in ascending order |
|---|