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GRACE-FO 1

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GRACE-FO 1 is classified as:


NORAD ID: 43476
Int'l Code: 2018-047A
Perigee: 488.9 km
Apogee: 514.7 km
Inclination: 89.0 °
Period: 94.5 minutes
Semi major axis: 6872 km
RCS: Unknown
Launch date: May 22, 2018
Source: United States (US)
Launch site: AIR FORCE WESTERN TEST RANGE (AFWTR)

GRACE-FO 1 and GRACE-FO 2 are two identical Earth science satellites with primary research objective focused on gravity measurements and Earth's water cycle. Built by Airbus Defense and Space, the identical GRACE-Follow On satellites carry microwave ranging instruments to measure the separation between the craft as they fly around 137 miles (220 kilometers) apart in orbit. The ranging sensors require exacting precision, with the capability of measuring distance changes between the formation-flying satellites as small as a few microns—about the width of a blood cell. Changes in the range between the two GRACE-Follow On satellite will be caused by tiny variations in the pull of gravity from Earth below, telling scientists about the mass of water, rock and ice around the world.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 43476U 18047A   18173.93281952 +.00000253 +00000-0 +91527-5 0  9992
2 43476 088.9934 234.9355 0018790 152.0564 208.1696 15.23703488004733
Source of the keplerian elements: AFSPC