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 spacecraft
Bus & Motor
TIROS I, Unknown motor
Mass
130 kg wet, 130 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: 5 hours ago
TLE from 5 hours ago
0 ESSA 2 (OT-2)
1 02091U 66016A 25340.64516578 -.00000018 00000-0 13271-3 0 9994
2 02091 101.2394 249.5864 0038543 287.6462 133.7937 12.69427021769199Epoch: 2025-12-06T15:29Z
TLE epoch observation values (Epoch: 2025-12-06T15:29:02.323Z)
Latitude
59.86683°
Longitude
-78.2605°
Altitude
1,415.056 km
Speed
7.149 km/s
True Right ascension
15h 18m 40s
True Declination
59° 43' 48"
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
18:27:27
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,411.676 km
Perigee altitude
1,351.858 km
Semi-major axis
7,759.904 km
Eccentricity
0.00385
Inclination
101.2394°
RAAN
249.5864°
Arg. of periapsis
287.6462°
True anomaly
134.11145°
Mean anomaly
133.7937°
Eccentric anomaly
133.95268°
Mean motion
3.17511 °/min
Orbital period
113.38 mins
BSTAR
0.00013271
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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. |
|---|---|---|---|---|---|---|---|
| 6 mins | 2025-12-07 05:06:27.006Z | 67.931° E | 2025-12-07 05:09:27.006Z | 90.999° ESE | 12.923° | 2025-12-07 05:12:27.006Z | 113.511° SE |
| 14 mins | 2025-12-07 06:55:27.006Z | 21.328° NNE | 2025-12-07 07:01:27.006Z | 84.874° E | 44.173° | 2025-12-07 07:09:27.006Z | 191.991° SSW |
| 10 mins | 2025-12-07 08:47:27.006Z | 347.685° N | 2025-12-07 08:52:27.006Z | 303.654° NW | 22.622° | 2025-12-07 08:57:27.006Z | 260.472° W |
| 8 mins | 2025-12-07 15:57:27.006Z | 82.455° E | 2025-12-07 16:01:27.006Z | 48.44° ENE | 17.867° | 2025-12-07 16:05:27.006Z | 16.324° NNE |
| 15 mins | 2025-12-07 17:44:27.006Z | 157.064° SSE | 2025-12-07 17:51:27.006Z | 59.507° ENE | 44.795° | 2025-12-07 17:59:27.006Z | 344.95° N |
| 9 mins | 2025-12-07 19:39:27.006Z | 233.371° WSW | 2025-12-07 19:43:27.006Z | 266.73° W | 18.031° | 2025-12-07 19:48:27.006Z | 307.542° NW |
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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