Showing default

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.

Loading next visibility...

Iframe embed code

<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

Optional secondary NORAD IDs

Max 10 NORAD IDs; Separated by commas

Initial load time (optional)

ISO8601 Format

TLE date request (optional)

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 (61 years ago)

Launch vehicle

THOR DELTA E

Launch site

Air Force Eastern Test Range (AFETR)

Object type

Payload

Rocket body

Debris

Shape & HBR

CYL, 1.1 m

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 02091U 66016A   26255.20925184 -.00000031  00000-0  64475-4 0  9997
2 02091 101.2218 162.2415 0039295  79.7064  87.4921 12.69432304804660

Epoch: 2026-09-12T05:01Z

TLE epoch observation values (Epoch: 2026-09-12T05:01:19.358Z)

Latitude

12.07438°

Longitude

-81.89036°

Altitude

1,384.908 km

Speed

7.168 km/s

True Right ascension

22h 58m 38s

True Declination

12° 00' 36"

Sunlit

Object was in full shadow 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

06:41:15

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,412.237 km

Perigee altitude

1,351.252 km

Semi-major axis

7,759.881 km

Eccentricity

0.00393

Inclination

101.2218°

RAAN

162.2415°

Arg. of periapsis

79.7064°

True anomaly

87.94205°

Mean anomaly

87.4921°

Eccentric anomaly

87.71707°

Mean motion

3.17512 °/min

Orbital period

113.38 mins

BSTAR

0.000064475

Loading maneuver chart data...

Computing Atmospheric mass density...

Loading historical data...

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

Did you know?

You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

Click here to try in Sandbox

ESSA 2 (OT-2) Visibility forecast

Loading observer location...
Set Observer location

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.
9 mins	2026-09-12 15:41:19.900Z	87.496° E	2026-09-12 15:46:19.900Z	47.325° ENE	17.162°	2026-09-12 15:50:19.900Z	15.745° NNE
14 mins	2026-09-12 17:29:19.900Z	154.78° SSE	2026-09-12 17:36:19.900Z	54.574° ENE	78.816°	2026-09-12 17:43:19.900Z	346.187° N
9 mins	2026-09-12 19:24:19.900Z	232.65° WSW	2026-09-12 19:28:19.900Z	267.503° W	19.819°	2026-09-12 19:33:19.900Z	309.184° NW
10 mins	2026-09-13 05:24:19.900Z	53.234° ENE	2026-09-13 05:28:19.900Z	88.784° E	22.794°	2026-09-13 05:34:19.900Z	140.497° SSE
14 mins	2026-09-13 07:14:19.900Z	10.984° NNE	2026-09-13 07:20:19.900Z	316.415° NNW	69.536°	2026-09-13 07:28:19.900Z	209.341° SW
6 mins	2026-09-13 09:08:19.900Z	331.829° NNW	2026-09-13 09:11:19.900Z	306.936° NW	15.364°	2026-09-13 09:14:19.900Z	283.172° WNW

Items per page:

1–6 of 6 items

of 1 page

Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

Please sign in to view Co-orbital & Co-planar RSOs.

Click to sort rows by RSO header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Type header in ascending order	Click to sort rows by Inclination Δ header in ascending order	Click to sort rows by RAAN Δ header in ascending order	Click to sort rows by Coplanar Angle header in ascending order	Click to sort rows by SMA Δ header in ascending order	Click to sort rows by Orbital period header in ascending order	Click to sort rows by <5km Md TCA header in descending order

CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

Authenticating...

Click to sort rows by Secondary header in ascending order	Click to sort rows by Secondary name header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Owner header in ascending order	Click to sort rows by Obj. Type header in ascending order	Click to sort rows by Miss dist. header in ascending order	Click to sort rows by Rel. speed header in ascending order	Click to sort rows by Apr. angle header in ascending order	Click to sort rows by TCA header in descending order

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: 2026-09-12T05:01:19.358Z)

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