Key statistics
Satellite ESSA 2 (OT-2) at a glance.
Uptime
21845
Days in orbit
Revolutions
≈ 12.7
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
101.2
Latest
Satellite identification and parameters
Extended collection of information and parameters for ESSA 2 (OT-2).
Object identification
Identified? True
Debris? False
Object name: ESSA 2 (OT-2)
International designator: 1966-016A
Object number (NORAD): 2091
Object ID (CCSDS): 2091
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 113.437 minutes
Inclination: 101.2409 deg
SMA: 7762.411 km
Apoapsis: 1414.128 km
Periapsis: 1354.424 km
RAAN: 262.146 deg
Eccentricy: 0.0038457
Argument of periapsis: 261.2702 deg
Mean anomaly: 272.3041 deg
Mean motion: 12.69427194 rev/day
Mean motion (dot): -0.00000046 rev/day2
B* drag term: -0.0000080254 1/REarth
Two-line elements (TLE)
Creation date: Dec. 19, 2025, 9:06 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 19, 2025, 12:22 p.m. UTC
TLE line 0: 0 ESSA 2 (OT-2)
TLE line 1: 1 2091U 66016A 25353.51585611 -.00000046 00000-0 -80254-5 0 9997
TLE line 2: 2 2091 101.2409 262.1460 0038457 261.2702 272.3041 12.69427194770827
Live tracking on map
Real-time ground track for satellite ESSA 2 (OT-2).
In-orbit conjunctions
There are no conjunctions computed for ESSA 2 (OT-2), at the moment. Check back to stay up to date, as we update our databases every day.
Go to all conjunctionsAssociated 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 2 (OT-2) was lifted into orbit during the mission ‘Thor Delta E | ESSA 2’, on board a Thor Delta E space rocket.
The launch took place on Feb. 28, 1966, 1:58 p.m. from Space Launch Complex 17B.
For more information about the launch, click the button.
Thor Delta E | ESSA 2
Agency: N/A
Status: Launch Successful
Launch date: Feb. 28, 1966, 1:58 p.m. UTC
Rocket: Thor Delta E
Launch pad: Space Launch Complex 17B
Location: Cape Canaveral SFS, FL, USA
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Latest news about this satellite
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