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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: 5 hours ago

TLE from 5 hours ago

0 ESSA 3 (TOS-A)
1  2435U 66087A   26088.18361262 -.00000050  00000-0 -52675-4 0  9990
2  2435 101.0836 355.7848 0063750 197.4825 331.0566 12.56879166728958

Epoch: 2026-03-29T04:24Z

TLE epoch observation values (Epoch: 2026-03-29T04:24:24.130Z)

Latitude

11.55319°

Longitude

-74.62527°

Altitude

1,394.186 km

Speed

7.183 km/s

True Right ascension

11h 52m 16s

True Declination

11° 29' 29"

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

15:02:44

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,483.15 km

Perigee altitude

1,383.554 km

Semi-major axis

7,811.489 km

Eccentricity

0.00638

Inclination

101.0836°

RAAN

355.7848°

Arg. of periapsis

197.4825°

True anomaly

330.70059°

Mean anomaly

331.0566°

Eccentric anomaly

330.87884°

Mean motion

3.14371 °/min

Orbital period

114.51 mins

BSTAR

-0.000052675

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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.
6 mins	2026-03-29 15:12:58.930Z	69.011° E	2026-03-29 15:15:58.930Z	47.111° ENE	13.151°	2026-03-29 15:18:58.930Z	25.035° NE
15 mins	2026-03-29 16:59:58.930Z	141.35° SSE	2026-03-29 17:06:58.930Z	63.882° ENE	40.976°	2026-03-29 17:14:58.930Z	350.643° N
12 mins	2026-03-29 18:53:58.930Z	212.515° SW	2026-03-29 18:59:58.930Z	266.91° W	26.726°	2026-03-29 19:05:58.930Z	318.719° NNW
8 mins	2026-03-30 05:02:58.930Z	62.059° ENE	2026-03-30 05:05:58.930Z	87.242° E	17.395°	2026-03-30 05:10:58.930Z	128.088° SE
14 mins	2026-03-30 06:52:58.930Z	15.013° NNE	2026-03-30 06:59:58.930Z	260.958° W	44.845°	2026-03-30 07:06:58.930Z	201.833° SSW
8 mins	2026-03-30 08:47:58.930Z	335.911° NNW	2026-03-30 08:50:58.930Z	310.418° NW	18.08°	2026-03-30 08:55:58.930Z	270.143° WNW

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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: 5 hours ago

TLE from 5 hours ago

TLE epoch observation values (Epoch: 2026-03-29T04:24:24.130Z)

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: 5 hours ago