description 55 Cancri c Overview
55 Cancri c is a confirmed Neptune-class exoplanet orbiting the G-type star 55 Cancri, also known as Copernicus. Radial-velocity observations identified it in 2002 as the second planet in the system then known, and its orbit takes about 44 days at a distance of approximately 0.24 astronomical units. It lies between the system's innermost hot planet and its more distant giant planets, forming part of a multi-planet architecture.
help 55 Cancri c FAQ
What kind of planet is 55 Cancri c?
55 Cancri c is a confirmed Neptune-class exoplanet orbiting the G-type star 55 Cancri, also called Copernicus. It was identified through radial-velocity observations in 2002.
How long does 55 Cancri c take to orbit its star?
55 Cancri c takes about 44 days to complete one orbit. Its orbital distance is approximately 0.24 astronomical units from 55 Cancri.
Is 55 Cancri c the first planet found around Copernicus?
No. The 2002 detection identified it as the second known planet in the 55 Cancri system at that time. The system is now known to contain multiple confirmed planets.
How was 55 Cancri c discovered?
Astronomers detected 55 Cancri c by measuring the star's radial-velocity wobble. The method infers an orbiting planet from the changing motion of the host star along our line of sight.
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