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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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Identifier
2091, 1966-016A
Orbit
SSO
Last TLE update
23 hours ago
Origin
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)
1966-02-28 (59 years ago)
Launch vehicle
THOR DELTA E
Launch site
Air Force Eastern Test Range (AFETR)
Object type
Payload
Rocket body
Debris
Shape & HBR
Cyl, 1.07 m
Radar Cross Section
0.920 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 23 hours ago
0 ESSA 2 (OT-2)
1 02091U 66016A   25181.76233508 -.00000041  00000-0  14825-4 0  9992
2 02091 101.2438  94.5677 0038309 249.6090 170.9985 12.69423132749039
Epoch: 2025-06-30T18:17Z
TLE epoch observation values (Epoch: 2025-06-30T18:17:45.75Z)
Latitude
58.86625°
Longitude
-118.05711°
Altitude
1,423.463 km
Speed
7.141 km/s
True Right ascension
05h 01m 48s
True Declination
58° 43' 37"
Sunlit
Object was in daylight at epoch
Visualization orbit readout
Latitude
-21.59481°
Longitude
77.52183°
Altitude
1,371.356 km
Speed
7.182 km/s
Apparent Right ascension
17h 47m 50s
Apparent Declination
-29° 48' 04"
Sunlit
Object is in full shadow
Visualization observer readout
Local Sidereal Time
05:23:52
Azimuth
332.307° NNW
Elevation
-78.761°
Doppler factor
1
Orbital elements
Apogee altitude
1,411.51 km
Perigee altitude
1,352.055 km
Semi-major axis
7,759.92 km
Eccentricity
0.00383
Inclination
101.2438°
RAAN
94.5677°
Arg. of periapsis
249.609°
True anomaly
Unknown
Mean anomaly
170.9985°
Eccentric anomaly
Unknown
Mean motion
3.1751 °/min
Orbital period
113.38 mins
BSTAR
0.000014825
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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.
14 mins2025-07-01 18:39:13.945Z186.233° SSW2025-07-01 18:46:13.945Z260.155° W37.978°2025-07-01 18:53:13.945Z331.365° NNW
14 mins2025-07-02 06:33:13.945Z30.622° NE2025-07-02 06:39:13.945Z93.858° ESE38.011°2025-07-02 06:47:13.945Z176.287° S
12 mins2025-07-02 08:25:13.945Z354.365° N2025-07-02 08:30:13.945Z306.423° NW30.023°2025-07-02 08:37:13.945Z239.862° WSW
4 mins2025-07-02 15:38:13.945Z57.307° ENE2025-07-02 15:39:13.945Z49.696° ENE12.171°2025-07-02 15:42:13.945Z27.14° NE
14 mins2025-07-02 17:23:13.945Z138.493° SSE2025-07-02 17:29:13.945Z71.899° E40.156°2025-07-02 17:37:13.945Z351.158° N
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