description HD 217107 c Overview
HD 217107 c is a long-period giant exoplanet orbiting the star HD 217107 in the constellation Pisces. It was inferred from extended radial-velocity monitoring of a system that also contains the short-period planet HD 217107 b. The outer planet has a minimum mass of roughly two to three Jupiter masses and an orbit lasting several years. Its gravitational influence has been considered in discussions of the unusual orbital properties of the inner planet.
help HD 217107 c FAQ
How long does HD 217107 c take to orbit its star?
HD 217107 c is a long-period giant planet, so its orbit takes much longer than the short-period orbit of HD 217107 b. The outer planet was inferred from extended radial-velocity monitoring.
What star does HD 217107 c orbit?
It orbits HD 217107 in the constellation Pisces. The system also contains the inner planet HD 217107 b.
How massive is HD 217107 c?
Its minimum mass is roughly two to several Jupiter masses based on the available description. Because radial velocity measures a minimum mass, the true mass can be higher if the orbital tilt is unknown.
How was HD 217107 c detected?
Astronomers used long-term radial-velocity monitoring of HD 217107. The slower signal revealed an outer giant planet in addition to the already known short-period planet b.
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