Gliese 250
Encyclopedia
Gliese 250 is a binary star
system with a relatively high proper motion
. The primary star is a main sequence
orange dwarf star, while the smaller companion is a red dwarf
. The two stars are separated by 58 arcsec
s, which, at the estimated distance, is equivalent to about 500 AUs
.
Binary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
system with a relatively high proper motion
Proper motion
The proper motion of a star is its angular change in position over time as seen from the center of mass of the solar system. It is measured in seconds of arc per year, arcsec/yr, where 3600 arcseconds equal one degree. This contrasts with radial velocity, which is the time rate of change in...
. The primary star is a main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
orange dwarf star, while the smaller companion is a red dwarf
Red dwarf
According to the Hertzsprung-Russell diagram, a red dwarf star is a small and relatively cool star, of the main sequence, either late K or M spectral type....
. The two stars are separated by 58 arcsec
Arcsec
Arcsec may refer to:* arcsecond, a unit of angular measurement* arcsecant, an inverse trigonometric function...
s, which, at the estimated distance, is equivalent to about 500 AUs
Astronomical unit
An astronomical unit is a unit of length equal to about or approximately the mean Earth–Sun distance....
.