description HD 12661 b Overview
HD 12661 b is a gas-giant exoplanet orbiting the star HD 12661, a K-type star in the constellation Aries. It is the inner known planet in a two-planet system and completes an orbit in roughly 263 days. The planet was identified through radial-velocity measurements, which track changes in the star's line-of-sight motion. Its orbit and the presence of a more distant companion made the system an early example of a multi-planet system found around a star other than the Sun.
help HD 12661 b FAQ
What is HD 12661 b?
HD 12661 b is a gas-giant exoplanet orbiting the K-type star HD 12661 in the constellation Aries. It is the inner known planet in a two-planet system.
How long is HD 12661 b's orbit?
HD 12661 b completes one orbit in roughly 263 days. That is shorter than Earth's year but much longer than the few-day periods of hot Jupiters.
How was HD 12661 b found?
Astronomers detected it through radial-velocity measurements. The technique tracks changes in the host star's motion caused by the planet's gravitational pull.
Does HD 12661 b have a companion planet?
Yes. HD 12661 b is part of a two-planet system, and it is described as the inner known planet around HD 12661.
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