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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

CYL, 1.1 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 18 hours ago

TLE from 18 hours ago

0 ESSA 3 (TOS-A)
1 02435U 66087A   26263.59359565 -.00000048  00000-0 -37007-4 0  9992
2 02435 101.0618 160.6008 0063611 207.3178 220.7414 12.56881014750995

Epoch: 2026-09-20T14:14Z

TLE epoch observation values (Epoch: 2026-09-20T14:14:46.664Z)

Latitude

65.2153°

Longitude

-77.49745°

Altitude

1,484.758 km

Speed

7.11 km/s

True Right ascension

09h 02m 43s

True Declination

65° 05' 47"

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

01:04:10

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,483.033 km

Perigee altitude

1,383.654 km

Semi-major axis

7,811.48 km

Eccentricity

0.00636

Inclination

101.0618°

RAAN

160.6008°

Arg. of periapsis

207.3178°

True anomaly

220.26852°

Mean anomaly

220.7414°

Eccentric anomaly

220.50468°

Mean motion

3.14371 °/min

Orbital period

114.51 mins

BSTAR

-0.000037007

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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	2026-09-21 14:55:46.932Z	82.012° E	2026-09-21 14:59:46.932Z	51.755° ENE	17.314°	2026-09-21 15:04:46.932Z	14.391° NNE
15 mins	2026-09-21 16:43:46.932Z	151.703° SSE	2026-09-21 16:50:46.932Z	90.919° ESE	73.441°	2026-09-21 16:58:46.932Z	347.656° N
11 mins	2026-09-21 18:39:46.932Z	227.898° WSW	2026-09-21 18:44:46.932Z	271.459° WNW	23.377°	2026-09-21 18:50:46.932Z	317.154° NNW
11 mins	2026-09-22 04:45:46.932Z	47.434° ENE	2026-09-22 04:50:46.932Z	90.31° ESE	24.592°	2026-09-22 04:56:46.932Z	142.141° SSE
14 mins	2026-09-22 06:37:46.932Z	9.44° NNE	2026-09-22 06:43:46.932Z	310.386° NW	67.213°	2026-09-22 06:51:46.932Z	211.279° SW

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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: 18 hours ago

TLE from 18 hours ago

TLE epoch observation values (Epoch: 2026-09-20T14:14:46.664Z)

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: 18 hours ago