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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

23 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 23 hours ago

0 ESSA 2 (OT-2)
1 02091U 66016A   25181.76233508 -.00000041  00000-0  14825-4 0  9992
2 02091 101.2438  94.5677 0038309 249.6090 170.9985 12.69423132749039

Epoch: 2025-06-30T18:17Z

TLE epoch observation values (Epoch: 2025-06-30T18:17:45.75Z)

Latitude

58.86625°

Longitude

-118.05711°

Altitude

1,423.463 km

Speed

7.141 km/s

True Right ascension

05h 01m 48s

True Declination

58° 43' 37"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

-21.59481°

Longitude

77.52183°

Altitude

1,371.356 km

Speed

7.182 km/s

Apparent Right ascension

17h 47m 50s

Apparent Declination

-29° 48' 04"

Sunlit

Object is in full shadow

Visualization observer readout

Local Sidereal Time

05:23:52

Azimuth

332.307° NNW

Elevation

-78.761°

Doppler factor

Orbital elements

Apogee altitude

1,411.51 km

Perigee altitude

1,352.055 km

Semi-major axis

7,759.92 km

Eccentricity

0.00383

Inclination

101.2438°

RAAN

94.5677°

Arg. of periapsis

249.609°

True anomaly

Unknown

Mean anomaly

170.9985°

Eccentric anomaly

Unknown

Mean motion

3.1751 °/min

Orbital period

113.38 mins

BSTAR

0.000014825

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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.
14 mins	2025-07-01 18:39:13.945Z	186.233° SSW	2025-07-01 18:46:13.945Z	260.155° W	37.978°	2025-07-01 18:53:13.945Z	331.365° NNW
14 mins	2025-07-02 06:33:13.945Z	30.622° NE	2025-07-02 06:39:13.945Z	93.858° ESE	38.011°	2025-07-02 06:47:13.945Z	176.287° S
12 mins	2025-07-02 08:25:13.945Z	354.365° N	2025-07-02 08:30:13.945Z	306.423° NW	30.023°	2025-07-02 08:37:13.945Z	239.862° WSW
4 mins	2025-07-02 15:38:13.945Z	57.307° ENE	2025-07-02 15:39:13.945Z	49.696° ENE	12.171°	2025-07-02 15:42:13.945Z	27.14° NE
14 mins	2025-07-02 17:23:13.945Z	138.493° SSE	2025-07-02 17:29:13.945Z	71.899° E	40.156°	2025-07-02 17:37:13.945Z	351.158° N

Authenticating...

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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

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