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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

Last TLE update

21 hours ago

Origin

National Oceanic and Atmospheric Administration (US)

Manufacturer

RCA/East Windsor

Mission

Non-operational Civil Weather

Bus & Motor

TIROS I, Unknown motor

Mass

130 kg wet, 130 kg dry

Launch date (UTC)

1966-02-28 (59 years ago)

Launch vehicle

THOR DELTA E

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 1.07 m

Radar Cross Section

0.920 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history

TLE from 21 hours ago

0 ESSA 2 (OT-2)
1 02091U 66016A   25162.76028666 -.00000035  00000-0  45149-4 0  9994
2 02091 101.2457  76.0182 0038382 288.6694  92.5971 12.69422793746628

Epoch: 2025-06-11T18:14Z

TLE epoch observation values (Epoch: 2025-06-11T18:14:48.767Z)

Latitude

21.27957°

Longitude

-102.44259°

Altitude

1,388.103 km

Speed

7.167 km/s

True Right ascension

04h 46m 23s

True Declination

21° 10' 23"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

42.67222°

Longitude

93.35688°

Altitude

1,416.253 km

Speed

7.144 km/s

Apparent Right ascension

16h 06m 27s

Apparent Declination

7° 13' 42"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

02:03:55

Azimuth

321.883° NNW

Elevation

-35.028°

Doppler factor

Orbital elements

Apogee altitude

1,411.568 km

Perigee altitude

1,352 km

Semi-major axis

7,759.921 km

Eccentricity

0.00384

Inclination

101.2457°

RAAN

76.0182°

Arg. of periapsis

288.6694°

True anomaly

Unknown

Mean anomaly

92.5971°

Eccentric anomaly

Unknown

Mean motion

3.1751 °/min

Orbital period

113.38 mins

BSTAR

0.000045149

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

ESSA 2 (OT-2) Visibility forecast

Observer location: undefined°, undefined°

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	2025-06-12 16:57:32.005Z	125.195° SE	2025-06-12 17:04:32.005Z	55.624° ENE	32.8°	2025-06-12 17:10:32.005Z	359.969° N
13 mins	2025-06-12 18:49:32.005Z	194.742° SSW	2025-06-12 18:55:32.005Z	261.385° W	35.276°	2025-06-12 19:02:32.005Z	329.309° NNW
14 mins	2025-06-13 06:42:32.005Z	28.06° NE	2025-06-13 06:48:32.005Z	93.584° ESE	40.424°	2025-06-13 06:56:32.005Z	180.891° SSW
12 mins	2025-06-13 08:34:32.005Z	352.02° N	2025-06-13 08:39:32.005Z	304.947° NW	27.881°	2025-06-13 08:46:32.005Z	243.416° WSW

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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.