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→Astrometry
=== Astrometry ===
=== Astrometry ===
A star and planet orbit about a spot that is the center of gravity of the system known as the [[barycenter]]. For the Sun and Jupiter, the barycenter is 1.068 solar radii. With larger planets orbiting closer to the star, it is possible to detect the movement of the star against the distant background. This method was used to detect a planet orbiting Gliese 876.
A star and planet orbit about a spot that is the center of gravity of the system known as the [[orbit|barycenter]]. For the Sun and Jupiter, the barycenter is 1.068 solar radii. With larger planets orbiting closer to the star, it is possible to detect the movement of the star against the distant background. This method was used to detect a planet orbiting Gliese 876.
=== Radial velocity ===
=== Radial velocity ===