Key statistics
Satellite ESSA 2 (OT-2) at a glance.
Uptime
21681
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: 101.2432 deg
SMA: 7762.427 km
Apoapsis: 1414.053 km
Periapsis: 1354.532 km
RAAN: 102.3301 deg
Eccentricy: 0.0038339
Argument of periapsis: 233.2666 deg
Mean anomaly: 154.1706 deg
Mean motion: 12.69423222 rev/day
Mean motion (dot): -0.00000037 rev/day2
B* drag term: 0.000033674 1/REarth
Two-line elements (TLE)
Creation date: July 9, 2025, 2:22 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: July 8, 2025, 5:09 p.m. UTC
TLE line 0: 0 ESSA 2 (OT-2)
TLE line 1: 1 02091U 66016A 25189.71497723 -.00000037 00000-0 33674-4 0 9994
TLE line 2: 2 02091 101.2432 102.3301 0038339 233.2666 154.1706 12.69423222750044
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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