Magnitude 9.15 Apparent magnitude (V) 9.15 | ||
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Similar Struve 2398, Kruger 60, YZ Ceti, Groombridge 34, Groombridge 1618 | ||
Gliese 687, or GJ 687 (Gliese–Jahreiß 687) is a red dwarf in the constellation Draco. This is one of the closest stars to the Sun and lies at an approximate distance of less than 15 light years. Even though it is close by, it has a magnitude of about 9, so it can only be seen through a moderately sized telescope. Gliese 687 has a high proper motion, advancing 1.304 arcseconds per year across the sky. It has a net relative velocity of about 39 km/s. It is known to have a Neptune-mass planet.
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Properties
Gliese 687 has about 40% of the Sun's mass and nearly 50% of the Sun's radius. Compared to the Sun, it has a slightly higher proportion of elements with higher atomic numbers than helium. It appears to have a rotation of 60 days and to be somewhat chromospherically active.
It displays no excess of infrared radiation that would indicate orbiting dust. It is known to have a planet, Gliese 687 b, with a mass of 19 Earth masses (which makes it comparable to Neptune), an orbital period of 38.14 days, and a low orbital eccentricity.
X-ray source
Gliese 687 is a solitary red dwarf that emits X-rays.