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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: 9 hours ago

TLE from 9 hours ago

0 ESSA 2 (OT-2)
1  2091U 66016A   26119.70979360 -.00000031  00000-0  66797-4 0  9995
2  2091 101.2361  30.1402 0038906 355.5974  60.5687 12.69430178787478

Epoch: 2026-04-29T17:02Z

TLE epoch observation values (Epoch: 2026-04-29T17:02:06.167Z)

Latitude

55.02251°

Longitude

-99.46449°

Altitude

1,378.439 km

Speed

7.182 km/s

True Right ascension

00h 54m 54s

True Declination

54° 52' 26"

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

09:31:37

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,411.944 km

Perigee altitude

1,351.563 km

Semi-major axis

7,759.891 km

Eccentricity

0.00389

Inclination

101.2361°

RAAN

30.1402°

Arg. of periapsis

355.5974°

True anomaly

60.95792°

Mean anomaly

60.5687°

Eccentric anomaly

60.76322°

Mean motion

3.17512 °/min

Orbital period

113.38 mins

BSTAR

0.000066797

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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	2026-04-30 06:35:57.587Z	24.127° NE	2026-04-30 06:42:57.587Z	101.757° ESE	42.149°	2026-04-30 06:50:57.587Z	185.11° SSW
11 mins	2026-04-30 08:28:57.587Z	349.017° N	2026-04-30 08:33:57.587Z	301.284° NW	25.955°	2026-04-30 08:39:57.587Z	249.414° W
6 mins	2026-04-30 15:39:57.587Z	72.568° E	2026-04-30 15:42:57.587Z	48.101° ENE	14.689°	2026-04-30 15:45:57.587Z	24.027° NE
13 mins	2026-04-30 17:26:57.587Z	148.087° SSE	2026-04-30 17:32:57.587Z	65.454° ENE	43.294°	2026-04-30 17:39:57.587Z	348.583° N
9 mins	2026-04-30 19:20:57.587Z	229.065° WSW	2026-04-30 19:24:57.587Z	266.649° W	21.405°	2026-04-30 19:29:57.587Z	310.71° NW

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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: 9 hours ago

TLE from 9 hours ago

TLE epoch observation values (Epoch: 2026-04-29T17:02:06.167Z)

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: 9 hours ago