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ESSA 4 (TOS-B), 2657

Orbit data source: Space-Track

ESSA 4 (TOS-B), 2657 is a payload satellite owned by ESSA (US) in SSO that was launched on Thu, 26 Jan 1967 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/2657?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/2657?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

2657, 1967-006A

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

132 kg wet, 132 kg dry

Launch date (UTC)

1967-01-26 (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: 18 hours ago

TLE from 18 hours ago

0 ESSA 4 (TOS-B)
1 02657U 67006A   25310.47499963 -.00000050  00000-0 -52599-5 0  9993
2 02657 102.0869 132.9680 0073035 355.8226  59.5157 12.69886469724279

Epoch: 2025-11-06T11:23Z

TLE epoch observation values (Epoch: 2025-11-06T11:23:59.968Z)

Latitude

54.31525°

Longitude

-101.22388°

Altitude

1,362.687 km

Speed

7.195 km/s

True Right ascension

07h 42m 50s

True Declination

54° 09' 54"

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

01:00:30

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,436.604 km

Perigee altitude

1,323.282 km

Semi-major axis

7,758.08 km

Eccentricity

0.0073

Inclination

102.0869°

RAAN

132.968°

Arg. of periapsis

355.8226°

True anomaly

60.24027°

Mean anomaly

59.5157°

Eccentric anomaly

59.87765°

Mean motion

3.17623 °/min

Orbital period

113.34 mins

BSTAR

-0.0000052599

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Other satellites on launch #6 in the year 1967 (1967-01-26 UTC)

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ESSA 4 (TOS-B) 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.
8 mins	2025-11-07 10:00:22.505Z	81.367° E	2025-11-07 10:04:22.505Z	48.619° ENE	16.058°	2025-11-07 10:08:22.505Z	16.352° NNE
13 mins	2025-11-07 11:48:22.505Z	151.103° SSE	2025-11-07 11:54:22.505Z	66.523° ENE	44.151°	2025-11-07 12:01:22.505Z	345.885° N
9 mins	2025-11-07 13:42:22.505Z	230.369° WSW	2025-11-07 13:46:22.505Z	266.633° W	19.44°	2025-11-07 13:51:22.505Z	309.128° NW
10 mins	2025-11-07 23:42:22.505Z	55.424° ENE	2025-11-07 23:47:22.505Z	97.712° ESE	19.224°	2025-11-07 23:52:22.505Z	136.715° SSE
14 mins	2025-11-08 01:32:22.505Z	15.138° NNE	2025-11-08 01:39:22.505Z	248.609° W	44.402°	2025-11-08 01:46:22.505Z	205.175° SW
8 mins	2025-11-08 03:25:22.505Z	340.069° N	2025-11-08 03:29:22.505Z	306.268° NW	17.974°	2025-11-08 03:33:22.505Z	274.445° WNW

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 4 (TOS-B), 2657 on other resources

View ESSA 4 (TOS-B), 2657 on NASA - NSSDCA Website

View ESSA 4 (TOS-B), 2657 on Heavens-Above

View ESSA 4 (TOS-B), 2657 on Keep Track

View ESSA 4 (TOS-B), 2657 on Celestrak

View ESSA 4 (TOS-B), 2657 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 4 (TOS-B), 2657

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: 2025-11-06T11:23:59.968Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #6 in the year 1967 (1967-01-26 UTC)

ESSA 4 (TOS-B) Visibility forecast

Co-orbital & Co-planar RSOs

Check out ESSA 4 (TOS-B), 2657 on other resources

Documentation

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