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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: 2 days ago

TLE from 2 days ago

0 ESSA 2 (OT-2)
1 02091U 66016A   26174.50884197 -.00000051  00000-0 -33352-4 0  9991
2 02091 101.2322  83.5823 0038334 243.4790 290.3900 12.69431154794429

Epoch: 2026-06-23T12:12Z

TLE epoch observation values (Epoch: 2026-06-23T12:12:43.946Z)

Latitude

6.34758°

Longitude

169.97937°

Altitude

1,376.011 km

Speed

7.176 km/s

True Right ascension

17h 39m 22s

True Declination

6° 18' 46"

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

22:44:57

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,411.496 km

Perigee altitude

1,352.003 km

Semi-major axis

7,759.886 km

Eccentricity

0.00383

Inclination

101.2322°

RAAN

83.5823°

Arg. of periapsis

243.479°

True anomaly

289.97756°

Mean anomaly

290.39°

Eccentric anomaly

290.18385°

Mean motion

3.17512 °/min

Orbital period

113.38 mins

BSTAR

-0.000033352

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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.
13 mins	2026-06-25 16:23:56.256Z	115.122° SE	2026-06-25 16:29:56.256Z	64.849° ENE	27.558°	2026-06-25 16:36:56.256Z	2.287° NNE
14 mins	2026-06-25 18:14:56.256Z	181.431° SSW	2026-06-25 18:20:56.256Z	243.835° WSW	40.581°	2026-06-25 18:28:56.256Z	335.268° NNW
13 mins	2026-06-26 06:08:56.256Z	35.804° NE	2026-06-26 06:14:56.256Z	104.047° ESE	34.891°	2026-06-26 06:21:56.256Z	169.46° S
13 mins	2026-06-26 07:59:56.256Z	359.181° N	2026-06-26 08:05:56.256Z	299.7° NW	33.078°	2026-06-26 08:12:56.256Z	233.347° WSW

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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: 2 days ago

TLE from 2 days ago

TLE epoch observation values (Epoch: 2026-06-23T12:12:43.946Z)

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: 2 days ago