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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 URL

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 (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: 17 hours ago

TLE from 17 hours ago

0 ESSA 4 (TOS-B)
1 02657U 67006A   26125.48901852 -.00000054  00000-0 -25818-4 0  9991
2 02657 102.0873 321.8753 0073025   3.3561  51.4455 12.69890540747126

Epoch: 2026-05-05T11:44Z

TLE epoch observation values (Epoch: 2026-05-05T11:44:11.200Z)

Latitude

53.7516°

Longitude

-94.42997°

Altitude

1,355.917 km

Speed

7.202 km/s

True Right ascension

20h 19m 55s

True Declination

53° 36' 01"

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

12:40:20

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,436.58 km

Perigee altitude

1,323.273 km

Semi-major axis

7,758.064 km

Eccentricity

0.0073

Inclination

102.0873°

RAAN

321.8753°

Arg. of periapsis

3.3561°

True anomaly

52.10362°

Mean anomaly

51.4455°

Eccentric anomaly

51.77419°

Mean motion

3.17624 °/min

Orbital period

113.34 mins

BSTAR

-0.000025818

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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	2026-05-06 12:09:33.913Z	134.427° SE	2026-05-06 12:15:33.913Z	57.876° ENE	38.89°	2026-05-06 12:22:33.913Z	351.488° N
12 mins	2026-05-06 14:01:33.913Z	209.197° SW	2026-05-06 14:06:33.913Z	258.12° W	27.259°	2026-05-06 14:13:33.913Z	322.22° NNW
4 mins	2026-05-07 00:05:33.913Z	76.287° E	2026-05-07 00:07:33.913Z	91.528° ESE	12.302°	2026-05-07 00:09:33.913Z	106.514° ESE
14 mins	2026-05-07 01:53:33.913Z	23.932° NE	2026-05-07 01:59:33.913Z	96.538° ESE	43.783°	2026-05-07 02:07:33.913Z	191.095° SSW
11 mins	2026-05-07 03:45:33.913Z	348.101° N	2026-05-07 03:50:33.913Z	301.639° NW	23.939°	2026-05-07 03:56:33.913Z	253.434° W

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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: 17 hours ago

TLE from 17 hours ago

TLE epoch observation values (Epoch: 2026-05-05T11:44:11.200Z)

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: 17 hours ago