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: 13 hours ago
TLE from 13 hours ago
0 ESSA 2 (OT-2)
1 02091U 66016A 25242.04180920 -.00000031 00000-0 61948-4 0 9997
2 02091 101.2366 153.3916 0039058 126.8512 244.0951 12.69424116756684Epoch: 2025-08-30T01:00Z
TLE epoch observation values (Epoch: 2025-08-30T01:00:12.314Z)
Latitude
10.2927°
Longitude
157.80115°
Altitude
1,399.508 km
Speed
7.155 km/s
True Right ascension
10h 05m 20s
True Declination
10° 14' 15"
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
05:43:09
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,412.087 km
Perigee altitude
1,351.47 km
Semi-major axis
7,759.915 km
Eccentricity
0.00391
Inclination
101.2366°
RAAN
153.3916°
Arg. of periapsis
126.8512°
True anomaly
243.69336°
Mean anomaly
244.0951°
Eccentric anomaly
243.89414°
Mean motion
3.1751 °/min
Orbital period
113.38 mins
BSTAR
0.000061948
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Other satellites on launch #16 in the year 1966 (1966-02-28 UTC)
ESSA 2 (OT-2) Visibility forecast
Observer location: undefined°, undefined°
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. |
|---|---|---|---|---|---|---|---|
| 10 mins | 2025-08-30 16:15:33.229Z | 96.879° ESE | 2025-08-30 16:20:33.229Z | 53.25° ENE | 21.279° | 2025-08-30 16:25:33.229Z | 10.915° NNE |
| 14 mins | 2025-08-30 18:04:33.229Z | 167.009° S | 2025-08-30 18:10:33.229Z | 213.044° SW | 44.33° | 2025-08-30 18:18:33.229Z | 341.083° N |
| 5 mins | 2025-08-30 20:01:33.229Z | 254.967° W | 2025-08-30 20:03:33.229Z | 271.039° WNW | 13.532° | 2025-08-30 20:06:33.229Z | 294.546° NW |
| 12 mins | 2025-08-31 05:58:33.229Z | 44.121° NE | 2025-08-31 06:03:33.229Z | 92.501° ESE | 27.054° | 2025-08-31 06:10:33.229Z | 155.735° SSE |
| 13 mins | 2025-08-31 07:49:33.229Z | 4.522° NNE | 2025-08-31 07:55:33.229Z | 294.804° NW | 39.232° | 2025-08-31 08:02:33.229Z | 220.818° SW |
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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