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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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<iframe src="https://www.satcat.com/sats-embedded/2091?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/2091?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

2091, 1966-016A

Orbit

SSO

Country

Related business

National Oceanic and Atmospheric Administration (US)

Manufacturer

RCA/East Windsor

Mission

Non-operational spacecraft

Bus & Motor

TIROS I, Unknown motor

Mass

130 kg wet, 130 kg dry

Launch date (UTC)

1966-02-28 (60 years ago)

Launch vehicle

THOR DELTA E

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 12 hours ago

TLE from 12 hours ago

0 ESSA 2 (OT-2)
1 02091U 66016A   25310.31628317 -.00000029  00000-0  73748-4 0  9998
2 02091 101.2371 219.9944 0038907 349.4382 132.5106 12.69426120765343

Epoch: 2025-11-06T07:35Z

TLE epoch observation values (Epoch: 2025-11-06T07:35:26.865Z)

Latitude

56.11849°

Longitude

-102.52171°

Altitude

1,413.933 km

Speed

7.149 km/s

True Right ascension

03h 48m 27s

True Declination

55° 58' 21"

Sunlit

Object was in full shadow at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

15:25:39

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,411.962 km

Perigee altitude

1,351.579 km

Semi-major axis

7,759.907 km

Eccentricity

0.00389

Inclination

101.2371°

RAAN

219.9944°

Arg. of periapsis

349.4382°

True anomaly

132.83817°

Mean anomaly

132.5106°

Eccentric anomaly

132.67449°

Mean motion

3.17511 °/min

Orbital period

113.38 mins

BSTAR

0.000073748

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Other satellites on launch #16 in the year 1966 (1966-02-28 UTC)

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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	2025-11-07 06:16:05.637Z	30.295° NE	2025-11-07 06:23:05.637Z	93.811° ESE	34.842°	2025-11-07 06:30:05.637Z	167.143° S
13 mins	2025-11-07 08:09:05.637Z	357.325° N	2025-11-07 08:15:05.637Z	291.642° WNW	33.364°	2025-11-07 08:22:05.637Z	231.724° WSW
12 mins	2025-11-07 17:08:05.637Z	129.652° SE	2025-11-07 17:13:05.637Z	74.905° E	36.84°	2025-11-07 17:20:05.637Z	356.155° N
12 mins	2025-11-07 19:00:05.637Z	208.149° SW	2025-11-07 19:05:05.637Z	261.55° W	29.961°	2025-11-07 19:12:05.637Z	325.569° 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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Check out ESSA 2 (OT-2), 2091 on other resources

View ESSA 2 (OT-2), 2091 on NASA - NSSDCA Website

View ESSA 2 (OT-2), 2091 on Heavens-Above

View ESSA 2 (OT-2), 2091 on Keep Track

View ESSA 2 (OT-2), 2091 on Celestrak

View ESSA 2 (OT-2), 2091 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

ESSA 2 (OT-2), 2091

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 12 hours ago

TLE from 12 hours ago

TLE epoch observation values (Epoch: 2025-11-06T07:35:26.865Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #16 in the year 1966 (1966-02-28 UTC)

ESSA 2 (OT-2) Visibility forecast

Co-orbital & Co-planar RSOs

Check out ESSA 2 (OT-2), 2091 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 12 hours ago