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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

6 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 6 hours ago

0 ESSA 2 (OT-2)
1 02091U 66016A   25195.63490935 -.00000028  00000-0  83423-4 0  9997
2 02091 101.2424 108.1082 0038410 221.1432 207.9192 12.69423328750797

Epoch: 2025-07-14T15:14Z

TLE epoch observation values (Epoch: 2025-07-14T15:14:16.167Z)

Latitude

66.25776°

Longitude

-79.92371°

Altitude

1,421.97 km

Speed

7.144 km/s

True Right ascension

05h 25m 32s

True Declination

66° 08' 30"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

56.2876°

Longitude

-70.21577°

Altitude

1,421.979 km

Speed

7.142 km/s

Apparent Right ascension

01h 13m 32s

Apparent Declination

31° 30' 34"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

09:22:40

Azimuth

313.877° NW

Elevation

-0.796°

Doppler factor

Orbital elements

Apogee altitude

1,411.588 km

Perigee altitude

1,351.976 km

Semi-major axis

7,759.919 km

Eccentricity

0.00384

Inclination

101.2424°

RAAN

108.1082°

Arg. of periapsis

221.1432°

True anomaly

Unknown

Mean anomaly

207.9192°

Eccentric anomaly

Unknown

Mean motion

3.1751 °/min

Orbital period

113.38 mins

BSTAR

0.000083423

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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.
15 mins	2025-07-15 06:37:15.415Z	25.2° NE	2025-07-15 06:45:15.415Z	110.771° ESE	39.59°	2025-07-15 06:52:15.415Z	178.678° S
12 mins	2025-07-15 08:30:15.415Z	354.889° N	2025-07-15 08:36:15.415Z	297.167° NW	28.283°	2025-07-15 08:42:15.415Z	243.837° WSW
5 mins	2025-07-15 15:43:15.415Z	60.861° ENE	2025-07-15 15:45:15.415Z	45.104° ENE	13.331°	2025-07-15 15:48:15.415Z	22.597° NE
14 mins	2025-07-15 17:28:15.415Z	142.947° SSE	2025-07-15 17:35:15.415Z	52.61° ENE	41.347°	2025-07-15 17:42:15.415Z	350.514° N
12 mins	2025-07-15 19:21:15.415Z	215.37° SW	2025-07-15 19:26:15.415Z	259.929° W	25.024°	2025-07-15 19:33:15.415Z	320.367° NNW

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

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.