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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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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, 1.1 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 10 hours ago

TLE from 10 hours ago

0 ESSA 4 (TOS-B)
1 02657U 67006A   26305.80823378 -.00000055  00000-0 -30290-4 0  9994
2 02657 102.0690 150.9693 0073156   9.9957   0.8712 12.69892844770010

Epoch: 2026-11-01T19:23Z

TLE epoch observation values (Epoch: 2026-11-01T19:23:51.398Z)

Latitude

10.59117°

Longitude

176.63098°

Altitude

1,327.444 km

Speed

7.221 km/s

True Right ascension

09h 54m 45s

True Declination

10° 32' 02"

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

01:34:36

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,436.671 km

Perigee altitude

1,323.161 km

Semi-major axis

7,758.053 km

Eccentricity

0.00732

Inclination

102.069°

RAAN

150.9693°

Arg. of periapsis

9.9957°

True anomaly

0.88406°

Mean anomaly

0.8712°

Eccentric anomaly

0.87762°

Mean motion

3.17625 °/min

Orbital period

113.34 mins

BSTAR

-0.00003029

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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.
13 mins	2026-11-02 12:28:59.507Z	123.813° SE	2026-11-02 12:35:59.507Z	56.321° ENE	38.014°	2026-11-02 12:41:59.507Z	359.386° N
13 mins	2026-11-02 14:20:59.507Z	191.743° SSW	2026-11-02 14:26:59.507Z	260.93° W	45.936°	2026-11-02 14:33:59.507Z	329.492° NNW
14 mins	2026-11-03 02:12:59.507Z	30.114° NE	2026-11-03 02:19:59.507Z	105.773° ESE	52.024°	2026-11-03 02:26:59.507Z	175.677° S
13 mins	2026-11-03 04:04:59.507Z	357.431° N	2026-11-03 04:10:59.507Z	298.175° NW	36.478°	2026-11-03 04:17:59.507Z	238.413° WSW

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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: 10 hours ago

TLE from 10 hours ago

TLE epoch observation values (Epoch: 2026-11-01T19:23:51.398Z)

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: 10 hours ago