ESSA 2 (OT-2), 2091
Orbit data source: Space-Track
ESSA 2 (OT-2), 2091 is a payload satellite owned by ESSA (US) in SSO that was launched on Mon, 28 Feb 1966 UTC via a THOR DELTA E 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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2091 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
130 kg wet, 130 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: 12 hours ago
TLE from 12 hours ago
0 ESSA 2 (OT-2)
1 02091U 66016A 25259.62815565 -.00000041 00000-0 11940-4 0 9997
2 02091 101.2355 170.5477 0039244 91.4684 332.1106 12.69424490758913Epoch: 2025-09-16T15:04Z
TLE epoch observation values (Epoch: 2025-09-16T15:04:32.648Z)
Latitude
61.34567°
Longitude
-72.61002°
Altitude
1,367.71 km
Speed
7.193 km/s
True Right ascension
09h 57m 22s
True Declination
61° 12' 44"
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
19:43:37
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,412.23 km
Perigee altitude
1,351.324 km
Semi-major axis
7,759.914 km
Eccentricity
0.00392
Inclination
101.2355°
RAAN
170.5477°
Arg. of periapsis
91.4684°
True anomaly
331.89933°
Mean anomaly
332.1106°
Eccentric anomaly
332.00506°
Mean motion
3.1751 °/min
Orbital period
113.38 mins
BSTAR
0.00001194
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Other satellites on launch #16 in the year 1966 (1966-02-28 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 2 (OT-2) 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 | 2025-09-17 06:29:52.697Z | 28.485° NE | 2025-09-17 06:36:52.697Z | 103.798° ESE | 38.012° | 2025-09-17 06:43:52.697Z | 175.011° S |
| 11 mins | 2025-09-17 08:22:52.697Z | 352.459° N | 2025-09-17 08:27:52.697Z | 300.582° NW | 29.685° | 2025-09-17 08:33:52.697Z | 242.368° WSW |
| 13 mins | 2025-09-17 17:20:52.697Z | 139.026° SSE | 2025-09-17 17:26:52.697Z | 71.325° E | 40.079° | 2025-09-17 17:33:52.697Z | 352.674° N |
| 11 mins | 2025-09-17 19:13:52.697Z | 215.154° SW | 2025-09-17 19:18:52.697Z | 264.741° W | 26.178° | 2025-09-17 19:24:52.697Z | 319.222° 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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