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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 Civil Weather

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

Cyl, 0.6 m

Radar Cross Section

0.994 m², Medium (>0.1 m² and < 1m²)

Expand to show TLE details & history
Last TLE update: 7 hours ago

TLE from 7 hours ago

0 ESSA 4 (TOS-B)
1 02657U 67006A   25259.29309183 -.00000028  00000-0  10404-3 0  9990
2 02657 102.0892  79.2533 0073253  95.8467  77.0255 12.69885409717779

Epoch: 2025-09-16T07:02Z

TLE epoch observation values (Epoch: 2025-09-16T07:02:03.134Z)

Latitude

6.09689°

Longitude

159.55918°

Altitude

1,372.042 km

Speed

7.179 km/s

True Right ascension

17h 22m 13s

True Declination

6° 03' 49"

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

07:14:38

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,436.778 km

Perigee altitude

1,323.117 km

Semi-major axis

7,758.085 km

Eccentricity

0.00733

Inclination

102.0892°

RAAN

79.2533°

Arg. of periapsis

95.8467°

True anomaly

77.84514°

Mean anomaly

77.0255°

Eccentric anomaly

77.43516°

Mean motion

3.17623 °/min

Orbital period

113.34 mins

BSTAR

0.00010404

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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.
11 mins	2025-09-16 23:47:56.798Z	46.601° ENE	2025-09-16 23:52:56.798Z	91.99° ESE	24.004°	2025-09-16 23:58:56.798Z	147.312° SSE
13 mins	2025-09-17 01:38:56.798Z	8.625° NNE	2025-09-17 01:44:56.798Z	296.484° NW	41.496°	2025-09-17 01:51:56.798Z	216.65° SW
5 mins	2025-09-17 03:32:56.798Z	328.735° NNW	2025-09-17 03:34:56.798Z	312.478° NW	12.79°	2025-09-17 03:37:56.798Z	289.079° WNW
11 mins	2025-09-17 10:38:56.798Z	113.215° SE	2025-09-17 10:43:56.798Z	62.318° ENE	29.58°	2025-09-17 10:49:56.798Z	2.401° NNE
13 mins	2025-09-17 12:28:56.798Z	186.209° SSW	2025-09-17 12:34:56.798Z	252.126° W	37.998°	2025-09-17 12:41:56.798Z	330.317° NNW

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: 7 hours ago

TLE from 7 hours ago

TLE epoch observation values (Epoch: 2025-09-16T07:02:03.134Z)

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: 7 hours ago