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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: 6 hours ago

TLE from 6 hours ago

0 ESSA 4 (TOS-B)
1  2657U 67006A   26106.80859000 -.00000034  00000-0  74383-4 0  9991
2  2657 102.0886 302.2752 0073155  39.8826 331.9475 12.69890282744751

Epoch: 2026-04-16T19:24Z

TLE epoch observation values (Epoch: 2026-04-16T19:24:22.175Z)

Latitude

11.13369°

Longitude

163.82832°

Altitude

1,334.206 km

Speed

7.214 km/s

True Right ascension

19h 59m 29s

True Declination

11° 04' 25"

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

07:50:50

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,436.682 km

Perigee altitude

1,323.174 km

Semi-major axis

7,758.065 km

Eccentricity

0.00732

Inclination

102.0886°

RAAN

302.2752°

Arg. of periapsis

39.8826°

True anomaly

331.55006°

Mean anomaly

331.9475°

Eccentric anomaly

331.7491°

Mean motion

3.17624 °/min

Orbital period

113.34 mins

BSTAR

0.000074383

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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.
15 mins	2026-04-17 01:37:33.416Z	24.555° NE	2026-04-17 01:44:33.416Z	89.416° E	41.79°	2026-04-17 01:52:33.416Z	185.423° SSW
11 mins	2026-04-17 03:30:33.416Z	351.982° N	2026-04-17 03:35:33.416Z	305.112° NW	26.064°	2026-04-17 03:41:33.416Z	250.927° W
6 mins	2026-04-17 10:42:33.416Z	68.662° E	2026-04-17 10:44:33.416Z	51.243° ENE	15.556°	2026-04-17 10:48:33.416Z	18.162° NNE
13 mins	2026-04-17 12:28:33.416Z	151.087° SSE	2026-04-17 12:34:33.416Z	88.46° E	43.939°	2026-04-17 12:41:33.416Z	346.257° N
9 mins	2026-04-17 14:22:33.416Z	227.882° WSW	2026-04-17 14:26:33.416Z	263.403° W	19.37°	2026-04-17 14:31:33.416Z	307.454° NW
9 mins	2026-04-18 00:23:33.416Z	62.249° ENE	2026-04-18 00:27:33.416Z	97.611° ESE	18.515°	2026-04-18 00:32:33.416Z	136.571° SSE

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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: 6 hours ago

TLE from 6 hours ago

TLE epoch observation values (Epoch: 2026-04-16T19:24:22.175Z)

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: 6 hours ago