ESSA 4 (TOS-B)

Satellite information

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Satellite Type and Status

PAYLOADIN ORBIT

Key statistics

Satellite ESSA 4 (TOS-B) at a glance.

Uptime

21347

Days in orbit

Revolutions

≈ 12.7

Per day

Orbit

SSO

Sun Synchronous Orbit

Inclination

102.1

Latest

Satellite identification and parameters

Extended collection of information and parameters for ESSA 4 (TOS-B).

Object identification

Identified? True

Debris? False

Object name: ESSA 4 (TOS-B)

International designator: 1967-006A

Object number (NORAD): 2657

Object ID (CCSDS): 2657

Country: UNITED STATES OF AMERICA (US)

Current information (Y/N): Y

RCS size: MEDIUM

Orbital parameters

Period: 113.396 minutes

Inclination: 102.0849 deg

SMA: 7760.549 km

Apoapsis: 1438.892 km

Periapsis: 1325.937 km

RAAN: 3.918 deg

Eccentricy: 0.0072775

Argument of periapsis: 236.3715 deg

Mean anomaly: 136.7952 deg

Mean motion: 12.69884046 rev/day

Mean motion (dot): -0.00000031 rev/day2

B* drag term: 0.000091403 1/REarth

Two-line elements (TLE)

Creation date: July 6, 2025, 6:05 p.m.

Reference frame: TEME

Reference center: EARTH

Epoch: July 6, 2025, 11:43 a.m. UTC

TLE line 0: 0 ESSA 4 (TOS-B)

TLE line 1: 1 02657U 67006A 25187.48860769 -.00000031 00000-0 91403-4 0 9996

TLE line 2: 2 02657 102.0849 3.9180 0072775 236.3715 136.7952 12.69884046708660

Live tracking on map

Real-time ground track for satellite ESSA 4 (TOS-B).

In-orbit conjunctions

A list of the most updated potential collisions computed for object ESSA 4 (TOS-B).

Target Orbit TCA Probability of collision Miss distance Type
COSMOS 397 DEB LEO 2025-02-02 22:45:04 0.0002277459 220.0 (m) DEBRIS

Associated space launch

The ESSA series was the second generation of US meterological satellites after the TIROS (Television & Infra-Red Observation Satellite) series. They were also called OT (Operational TIROS), TOS (TIROS Operational Satellite).

ESSA 4 (TOS-B) was lifted into orbit during the mission ‘Thor Delta E | ESSA 4’, on board a Thor Delta E space rocket.

The launch took place on Jan. 26, 1967, 5:31 p.m. from Space Launch Complex 2E.

For more information about the launch, click the button.

Launch to space Thor Delta E | ESSA 4
Thor Delta E | ESSA 4

Agency: N/A

Status: Launch Successful

Launch date: Jan. 26, 1967, 5:31 p.m. UTC

Rocket: Thor Delta E

Launch pad: Space Launch Complex 2E

Location: Vandenberg SFB, CA, USA

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