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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 02435U 66087A   26150.33713830 -.00000032  00000-0  55500-4 0  9998
2 02435 101.0792  54.2127 0064467  73.8233  40.8733 12.56880138736766

Epoch: 2026-05-30T08:05Z

TLE epoch observation values (Epoch: 2026-05-30T08:05:28.749Z)

Latitude

62.72202°

Longitude

-112.81026°

Altitude

1,408.508 km

Speed

7.179 km/s

True Right ascension

17h 05m 39s

True Declination

62° 35' 36"

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

08:22:39

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,483.706 km

Perigee altitude

1,382.989 km

Semi-major axis

7,811.485 km

Eccentricity

0.00645

Inclination

101.0792°

RAAN

54.2127°

Arg. of periapsis

73.8233°

True anomaly

41.35968°

Mean anomaly

40.8733°

Eccentric anomaly

41.11619°

Mean motion

3.14371 °/min

Orbital period

114.51 mins

BSTAR

0.0000555

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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	2026-05-31 05:09:17.735Z	45.238° ENE	2026-05-31 05:15:17.735Z	98.402° ESE	23.399°	2026-05-31 05:21:17.735Z	146.855° SSE
14 mins	2026-05-31 07:01:17.735Z	9.209° NNE	2026-05-31 07:08:17.735Z	279.45° WNW	42.323°	2026-05-31 07:15:17.735Z	213.087° SW
5 mins	2026-05-31 08:57:17.735Z	325.767° NNW	2026-05-31 08:59:17.735Z	309.683° NW	13.8°	2026-05-31 09:02:17.735Z	286.767° WNW
11 mins	2026-05-31 16:07:17.735Z	111.211° ESE	2026-05-31 16:12:17.735Z	62.113° ENE	28.463°	2026-05-31 16:18:17.735Z	4.888° NNE
14 mins	2026-05-31 17:58:17.735Z	184.888° SSW	2026-05-31 18:04:17.735Z	248.074° W	39.214°	2026-05-31 18:12:17.735Z	334.525° NNW

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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: 2026-05-30T08:05:28.749Z)

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