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Track SENTINEL 1B now!
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SENTINEL 1B is classified as:

NORAD ID: 41456
Int'l Code: 2016-025A
Perigee: 592.7 km
Apogee: 627.5 km
Inclination: 98.2 °
Period: 96.7 minutes
Semi major axis: 6981 km
RCS: Unknown
Launch date: April 25, 2016
Source: European Space Agency (ESA)

Sentinel-1B, the second spacecraft in the Sentinel-1 family of synthetic aperture radar (SAR) observation satellites, is part of a vast joint research program by ESA and the European Union called Copernicus. Copernicus aims to provide operational information on land masses, oceans and the Earth’s atmosphere – data that will play a critical role in determining the policies needed to protect our environment and security, and to meet the needs of both consumers and service providers.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 41456U 16025A   24055.85779462  .00005272  00000-0  57206-3 0  9997
2 41456  98.1749  72.8253 0024893  35.5057 324.7809 14.88386975417765
Source of the keplerian elements: AFSPC