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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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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: 8 hours ago

TLE from 8 hours ago

0 ESSA 2 (OT-2)
1  2091U 66016A   26125.69893530 -.00000015  00000-0  14469-3 0  9994
2  2091 101.2357  35.9816 0038799 343.4787  70.6003 12.69430345788238

Epoch: 2026-05-05T16:46Z

TLE epoch observation values (Epoch: 2026-05-05T16:46:28.009Z)

Latitude

53.08253°

Longitude

-94.45934°

Altitude

1,382.841 km

Speed

7.177 km/s

True Right ascension

01h 22m 54s

True Declination

52° 55' 50"

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

08:17:55

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,411.86 km

Perigee altitude

1,351.645 km

Semi-major axis

7,759.89 km

Eccentricity

0.00388

Inclination

101.2357°

RAAN

35.9816°

Arg. of periapsis

343.4787°

True anomaly

71.02033°

Mean anomaly

70.6003°

Eccentric anomaly

70.81025°

Mean motion

3.17512 °/min

Orbital period

113.38 mins

BSTAR

0.00014469

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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	2026-05-06 06:20:52.008Z	27.218° NE	2026-05-06 06:27:52.008Z	92.101° ESE	38.385°	2026-05-06 06:35:52.008Z	176.568° S
12 mins	2026-05-06 08:13:52.008Z	354.339° N	2026-05-06 08:19:52.008Z	292.685° NW	29.872°	2026-05-06 08:25:52.008Z	240.71° WSW
4 mins	2026-05-06 15:26:52.008Z	58.548° ENE	2026-05-06 15:28:52.008Z	43.005° NE	11.893°	2026-05-06 15:30:52.008Z	27.896° NE
14 mins	2026-05-06 17:11:52.008Z	139.822° SSE	2026-05-06 17:17:52.008Z	77.318° E	40.105°	2026-05-06 17:25:52.008Z	351.127° N
11 mins	2026-05-06 19:04:52.008Z	214.129° SW	2026-05-06 19:09:52.008Z	262.226° W	26.045°	2026-05-06 19:15:52.008Z	317.996° NNW

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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: 8 hours ago

TLE from 8 hours ago

TLE epoch observation values (Epoch: 2026-05-05T16:46:28.009Z)

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: 8 hours ago