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ESSA 3 (TOS-A), 2435

Orbit data source: Space-Track

ESSA 3 (TOS-A), 2435 is a payload satellite owned by ESSA (US) in SSO that was launched on Sun, 02 Oct 1966 UTC via a THOR DELTA E launch vehicle from the Air Force Western Test Range (AFWTR). 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/2435?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/2435?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

2435, 1966-087A

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

148 kg wet, 148 kg dry

Launch date (UTC)

1966-10-02 (59 years ago)

Launch vehicle

THOR DELTA E

Launch site

Air Force Western Test Range (AFWTR)

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: 13 hours ago

TLE from 13 hours ago

0 ESSA 3 (TOS-A)
1  2435U 66087A   25312.36509986 -.00000019  00000-0  12949-3 0  9999
2  2435 101.0844 223.3311 0064248 118.5980   0.7411 12.56876646711266

Epoch: 2025-11-08T08:45Z

TLE epoch observation values (Epoch: 2025-11-08T08:45:44.627Z)

Latitude

58.89579°

Longitude

-117.05014°

Altitude

1,395.458 km

Speed

7.191 km/s

True Right ascension

04h 08m 43s

True Declination

58° 45' 21"

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

17:45:14

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,483.55 km

Perigee altitude

1,383.175 km

Semi-major axis

7,811.5 km

Eccentricity

0.00642

Inclination

101.0844°

RAAN

223.3311°

Arg. of periapsis

118.598°

True anomaly

0.7507°

Mean anomaly

0.7411°

Eccentric anomaly

0.74589°

Mean motion

3.1437 °/min

Orbital period

114.51 mins

BSTAR

0.00012949

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Other satellites on launch #87 in the year 1966 (1966-10-02 UTC)

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ESSA 3 (TOS-A) 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.
12 mins	2025-11-09 05:47:26.091Z	40.691° NE	2025-11-09 05:53:26.091Z	90.182° ESE	23.688°	2025-11-09 05:59:26.091Z	144.189° SSE
14 mins	2025-11-09 07:40:26.091Z	8.195° NNE	2025-11-09 07:46:26.091Z	307.718° NW	41.697°	2025-11-09 07:54:26.091Z	213.788° SW
4 mins	2025-11-09 09:36:26.091Z	323.864° NNW	2025-11-09 09:37:26.091Z	315.9° NNW	13.063°	2025-11-09 09:40:26.091Z	292.353° WNW
12 mins	2025-11-09 16:45:26.091Z	115.664° SE	2025-11-09 16:51:26.091Z	58.433° ENE	29.414°	2025-11-09 16:57:26.091Z	3.387° NNE
13 mins	2025-11-09 18:37:26.091Z	187.229° SSW	2025-11-09 18:43:26.091Z	255.773° W	38.931°	2025-11-09 18:50:26.091Z	331.965° NNW

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 3 (TOS-A), 2435 on other resources

View ESSA 3 (TOS-A), 2435 on NASA - NSSDCA Website

View ESSA 3 (TOS-A), 2435 on Heavens-Above

View ESSA 3 (TOS-A), 2435 on Keep Track

View ESSA 3 (TOS-A), 2435 on Celestrak

View ESSA 3 (TOS-A), 2435 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 3 (TOS-A), 2435

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 13 hours ago

TLE from 13 hours ago

TLE epoch observation values (Epoch: 2025-11-08T08:45:44.627Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #87 in the year 1966 (1966-10-02 UTC)

ESSA 3 (TOS-A) Visibility forecast

Co-orbital & Co-planar RSOs

Check out ESSA 3 (TOS-A), 2435 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 13 hours ago