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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>

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https://www.satcat.com/sats-embedded/2657?theme=dark&initialShowStats=false

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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 (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, 0.6 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 11 hours ago

TLE from 11 hours ago

0 ESSA 4 (TOS-B)
1 02657U 67006A   26238.53359752 -.00000032  00000-0  83065-4 0  9991
2 02657 102.0800  80.4435 0073109 141.4801 247.5745 12.69892261761471

Epoch: 2026-08-26T12:48Z

TLE epoch observation values (Epoch: 2026-08-26T12:48:22.825Z)

Latitude

27.64274°

Longitude

-92.84062°

Altitude

1,407.483 km

Speed

7.149 km/s

True Right ascension

04h 56m 09s

True Declination

27° 30' 48"

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

14:57:27

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,436.638 km

Perigee altitude

1,323.201 km

Semi-major axis

7,758.056 km

Eccentricity

0.00731

Inclination

102.08°

RAAN

80.4435°

Arg. of periapsis

141.4801°

True anomaly

246.8028°

Mean anomaly

247.5745°

Eccentric anomaly

247.18838°

Mean motion

3.17624 °/min

Orbital period

113.34 mins

BSTAR

0.000083065

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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.
6 mins	2026-08-27 00:42:00.907Z	66.953° ENE	2026-08-27 00:45:00.907Z	91.3° ESE	13.388°	2026-08-27 00:48:00.907Z	115.46° SE
13 mins	2026-08-27 02:31:00.907Z	20.344° NNE	2026-08-27 02:37:00.907Z	75.219° E	44.639°	2026-08-27 02:44:00.907Z	195.583° SSW
9 mins	2026-08-27 04:24:00.907Z	341.328° N	2026-08-27 04:28:00.907Z	303.522° NW	20.348°	2026-08-27 04:33:00.907Z	261.752° W
10 mins	2026-08-27 11:32:00.907Z	93.393° ESE	2026-08-27 11:37:00.907Z	49.951° ENE	20.56°	2026-08-27 11:42:00.907Z	8.933° NNE
15 mins	2026-08-27 13:20:00.907Z	162.862° S	2026-08-27 13:27:00.907Z	237.518° WSW	44.882°	2026-08-27 13:35:00.907Z	341.26° N
7 mins	2026-08-27 15:16:00.907Z	242.213° WSW	2026-08-27 15:19:00.907Z	266.026° W	14.913°	2026-08-27 15:23:00.907Z	297.939° 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 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: 11 hours ago

TLE from 11 hours ago

TLE epoch observation values (Epoch: 2026-08-26T12:48:22.825Z)

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: 11 hours ago