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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 (60 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: 15 hours ago

TLE from 15 hours ago

0 ESSA 3 (TOS-A)
1  2435U 66087A   26129.32236285 -.00000035  00000-0  35941-4 0  9997
2  2435 101.0807  34.4600 0064331 115.4796 354.1787 12.56879943734126

Epoch: 2026-05-09T07:44Z

TLE epoch observation values (Epoch: 2026-05-09T07:44:12.150Z)

Latitude

67.6868°

Longitude

-100.38347°

Altitude

1,397.407 km

Speed

7.19 km/s

True Right ascension

16h 11m 14s

True Declination

67° 34' 33"

Sunlit

Object was in daylight 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

06:46:37

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,483.601 km

Perigee altitude

1,383.097 km

Semi-major axis

7,811.486 km

Eccentricity

0.00643

Inclination

101.0807°

RAAN

34.46°

Arg. of periapsis

115.4796°

True anomaly

354.10333°

Mean anomaly

354.1787°

Eccentric anomaly

354.14107°

Mean motion

3.14371 °/min

Orbital period

114.51 mins

BSTAR

0.000035941

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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.
9 mins	2026-05-10 04:51:05.745Z	55.907° ENE	2026-05-10 04:55:05.745Z	87.684° E	16.242°	2026-05-10 05:00:05.745Z	127.354° SE
14 mins	2026-05-10 06:42:05.745Z	16.033° NNE	2026-05-10 06:49:05.745Z	225.293° WSW	44.935°	2026-05-10 06:56:05.745Z	199.777° SSW
8 mins	2026-05-10 08:37:05.745Z	336.414° NNW	2026-05-10 08:40:05.745Z	310.297° NW	18.466°	2026-05-10 08:45:05.745Z	268.922° W
10 mins	2026-05-10 15:49:05.745Z	96.518° ESE	2026-05-10 15:54:05.745Z	50.958° ENE	22.477°	2026-05-10 15:59:05.745Z	9.517° NNE
14 mins	2026-05-10 17:39:05.745Z	170.28° S	2026-05-10 17:45:05.745Z	231.265° WSW	44.024°	2026-05-10 17:53:05.745Z	340.188° N
5 mins	2026-05-10 19:37:05.745Z	255.939° W	2026-05-10 19:39:05.745Z	271.191° WNW	12.565°	2026-05-10 19:42:05.745Z	293.762° NW

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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: 15 hours ago

TLE from 15 hours ago

TLE epoch observation values (Epoch: 2026-05-09T07:44:12.150Z)

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: 15 hours ago