Key statistics
Satellite ESSA 4 (TOS-B) at a glance.
Uptime
21287
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: 102.0816 deg
SMA: 7760.554 km
Apoapsis: 1439.014 km
Periapsis: 1325.825 km
RAAN: 301.2898 deg
Eccentricy: 0.0072926
Argument of periapsis: 353.7374 deg
Mean anomaly: 17.8035 deg
Mean motion: 12.69882809 rev/day
Mean motion (dot): -0.00000024 rev/day2
B* drag term: 0.00012448 1/REarth
Two-line elements (TLE)
Creation date: May 8, 2025, 3:01 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: May 7, 2025, 6:31 p.m. UTC
TLE line 0: 0 ESSA 4 (TOS-B)
TLE line 1: 1 02657U 67006A 25127.77215127 -.00000024 00000-0 12448-3 0 9997
TLE line 2: 2 02657 102.0816 301.2898 0072926 353.7374 17.8035 12.69882809701082
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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