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Track SENTINEL-3A now!
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SENTINEL-3A is classified as:

NORAD ID: 41335
Int'l Code: 2016-011A
Perigee: 808.8 km
Apogee: 810.8 km
Inclination: 98.6 °
Period: 100.9 minutes
Semi major axis: 7180 km
RCS: Unknown
Launch date: February 16, 2016
Source: European Space Agency (ESA)

SENTINEL 3A mission is set to last at least seven years, tracking changes in the planet's sea level, ocean color, marine organisms like algae and phytoplankton, ice sheets, and rivers and lakes. The satellite's instruments will measure global sea levels, detect the temperature of sea water, and determine the color of land and ocean surfaces worldwide. A powerful radar altimeter, together with a microwave radiometer, will be able to measure the height of the sea surface to an accuracy of 2 centimeters (0.8 inches) from 815 kilometers (506 miles) up in space. SENTINEL 3A is also featured with a thermal infrared radiometer, which will measure the temperature of the Earth, and that can measure the temperature of the ocean surface to an accuracy of about 0.2 degrees Celsius. An multi-spectral camera seeing in 21 visible and near-infrared bands will capture the colors of the sea, revealing oil spills, algae blooms, and plankton spreading across the ocean.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 41335U 16011A   24166.92033891  .00000216  00000-0  10747-3 0  9990
2 41335  98.6236 233.7637 0001399 102.1222 258.0115 14.26740983433641
Source of the keplerian elements: AFSPC