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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: 9 hours ago

TLE from 9 hours ago

0 ESSA 4 (TOS-B)
1  2657U 67006A   25294.81101455 -.00000050  00000-0 -41002-5 0  9995
2  2657 102.0879 116.5289 0073164  26.4677  90.2098 12.69886218722284

Epoch: 2025-10-21T19:27Z

TLE epoch observation values (Epoch: 2025-10-21T19:27:51.657Z)

Latitude

60.22943°

Longitude

-4.05776°

Altitude

1,393.084 km

Speed

7.168 km/s

True Right ascension

21h 13m 36s

True Declination

60° 05' 35"

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

23:03:13

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,436.706 km

Perigee altitude

1,323.183 km

Semi-major axis

7,758.081 km

Eccentricity

0.00732

Inclination

102.0879°

RAAN

116.5289°

Arg. of periapsis

26.4677°

True anomaly

91.04813°

Mean anomaly

90.2098°

Eccentric anomaly

90.62897°

Mean motion

3.17623 °/min

Orbital period

113.34 mins

BSTAR

-0.0000041002

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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.
9 mins	2025-10-22 10:10:19.012Z	89.503° E	2025-10-22 10:14:19.012Z	54.903° ENE	19.021°	2025-10-22 10:19:19.012Z	12.006° NNE
14 mins	2025-10-22 11:58:19.012Z	160.863° S	2025-10-22 12:05:19.012Z	330.573° NNW	44.744°	2025-10-22 12:12:19.012Z	341.966° N
7 mins	2025-10-22 13:54:19.012Z	244.34° WSW	2025-10-22 13:57:19.012Z	269.87° W	14.989°	2025-10-22 14:01:19.012Z	302.028° NW
11 mins	2025-10-22 23:52:19.012Z	49.145° ENE	2025-10-22 23:57:19.012Z	93.634° ESE	23.354°	2025-10-23 00:03:19.012Z	145.455° SSE
14 mins	2025-10-23 01:43:19.012Z	9.76° NNE	2025-10-23 01:49:19.012Z	290.451° WNW	42.722°	2025-10-23 01:57:19.012Z	212.575° SW
6 mins	2025-10-23 03:36:19.012Z	334.83° NNW	2025-10-23 03:39:19.012Z	310.655° NW	14.583°	2025-10-23 03:42:19.012Z	287.118° 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: 9 hours ago

TLE from 9 hours ago

TLE epoch observation values (Epoch: 2025-10-21T19:27:51.657Z)

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: 9 hours ago