Key statistics
Satellite ESSA 4 (TOS-B) at a glance.
Uptime
21512
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: 102.0844 deg
SMA: 7760.535 km
Apoapsis: 1438.963 km
Periapsis: 1325.837 km
RAAN: 177.0316 deg
Eccentricy: 0.00728859
Argument of periapsis: 273.4508 deg
Mean anomaly: 141.353 deg
Mean motion: 12.6988753 rev/day
Mean motion (dot): -0.00000035 rev/day2
B* drag term: 0.000072911836 1/REarth
Two-line elements (TLE)
Creation date: Dec. 18, 2025, 8:02 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 18, 2025, 11:09 a.m. UTC
TLE line 0: 0 ESSA 4 (TOS-B)
TLE line 1: 1 02657U 67006A 25352.46510618 -.00000035 00000-0 72912-4 0 9991
TLE line 2: 2 02657 102.0844 177.0316 0072886 273.4508 141.3530 12.69887530729606
Live tracking on map
Real-time ground track for satellite ESSA 4 (TOS-B).
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.
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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