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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 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: 14 hours ago

TLE from 14 hours ago

0 ESSA 2 (OT-2)
1  2091U 66016A   26199.69611551 -.00000026  00000-0  89186-4 0  9997
2  2091 101.2291 108.1398 0038633 191.8278 195.5626 12.69431683797627

Epoch: 2026-07-18T16:42Z

TLE epoch observation values (Epoch: 2026-07-18T16:42:24.380Z)

Latitude

26.74404°

Longitude

-84.68018°

Altitude

1,416.163 km

Speed

7.142 km/s

True Right ascension

06h 49m 42s

True Declination

26° 37' 04"

Sunlit

Object was in daylight 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

19:11:42

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,411.726 km

Perigee altitude

1,351.768 km

Semi-major axis

7,759.884 km

Eccentricity

0.00386

Inclination

101.2291°

RAAN

108.1398°

Arg. of periapsis

191.8278°

True anomaly

195.44438°

Mean anomaly

195.5626°

Eccentric anomaly

195.50343°

Mean motion

3.17512 °/min

Orbital period

113.38 mins

BSTAR

0.000089186

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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.
15 mins	2026-07-19 06:24:54.276Z	24.344° NE	2026-07-19 06:32:54.276Z	109.858° ESE	40.27°	2026-07-19 06:39:54.276Z	180.066° SSW
11 mins	2026-07-19 08:18:54.276Z	349.342° N	2026-07-19 08:23:54.276Z	298.118° NW	27.356°	2026-07-19 08:29:54.276Z	245.156° WSW
5 mins	2026-07-19 15:30:54.276Z	62.216° ENE	2026-07-19 15:32:54.276Z	46.229° ENE	13.762°	2026-07-19 15:35:54.276Z	23.282° NE
14 mins	2026-07-19 17:15:54.276Z	144.832° SSE	2026-07-19 17:22:54.276Z	56.418° ENE	42.001°	2026-07-19 17:29:54.276Z	350.094° N
11 mins	2026-07-19 19:09:54.276Z	221.757° SW	2026-07-19 19:14:54.276Z	269.853° W	24.135°	2026-07-19 19:20:54.276Z	319.098° NNW
7 mins	2026-07-20 05:11:54.276Z	63.745° ENE	2026-07-20 05:14:54.276Z	89.157° E	16.398°	2026-07-20 05:18:54.276Z	122.57° SE

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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: 14 hours ago

TLE from 14 hours ago

TLE epoch observation values (Epoch: 2026-07-18T16:42:24.380Z)

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: 14 hours ago