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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: 17 hours ago

TLE from 17 hours ago

0 ESSA 4 (TOS-B)
1  2657U 67006A   26035.51259007 -.00000048  00000-0  73573-5 0  9997
2  2657 102.0872 227.4526 0073064 179.2044 195.2655 12.69888767735704

Epoch: 2026-02-04T12:18Z

TLE epoch observation values (Epoch: 2026-02-04T12:18:07.782Z)

Latitude

13.90217°

Longitude

-94.78135°

Altitude

1,438.994 km

Speed

7.118 km/s

True Right ascension

14h 57m 43s

True Declination

13° 49' 45"

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

07:15:38

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,436.618 km

Perigee altitude

1,323.25 km

Semi-major axis

7,758.071 km

Eccentricity

0.00731

Inclination

102.0872°

RAAN

227.4526°

Arg. of periapsis

179.2044°

True anomaly

195.04698°

Mean anomaly

195.2655°

Eccentric anomaly

195.15605°

Mean motion

3.17623 °/min

Orbital period

113.34 mins

BSTAR

0.0000073573

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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	2026-02-05 11:03:36.688Z	113.882° SE	2026-02-05 11:10:36.688Z	51.361° ENE	27.502°	2026-02-05 11:16:36.688Z	1.299° NNE
14 mins	2026-02-05 12:54:36.688Z	179.813° S	2026-02-05 13:00:36.688Z	245.765° WSW	41.07°	2026-02-05 13:08:36.688Z	334.766° NNW
12 mins	2026-02-06 00:48:36.688Z	41.417° NE	2026-02-06 00:53:36.688Z	95.669° ESE	31.884°	2026-02-06 01:00:36.688Z	165.138° S
12 mins	2026-02-06 02:39:36.688Z	0.337° NNE	2026-02-06 02:45:36.688Z	289.095° WNW	34.862°	2026-02-06 02:51:36.688Z	231.324° 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: 17 hours ago

TLE from 17 hours ago

TLE epoch observation values (Epoch: 2026-02-04T12:18:07.782Z)

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