Struve 2398 is a binary star

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 in the constellation Draco

Draco (constellation)

Draco is a constellation in the far northern sky. Its name is Latin for dragon. Draco is circumpolar for many observers in the northern hemisphere...

. Both stars are 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....

s and both display variability common to flare star

Flare star

A flare star is a variable star that can undergo unpredictable dramatic increases in brightness for a few minutes. It is believed that the flares on flare stars are analogous to solar flares in that they are due to magnetic reconnection in the atmospheres of the stars. The brightness increase is...

s. The orbital period for the pair is about 295 years, with an average distance of about 56 astronomical units , and the eccentricity of the orbit is 0.70.

Struve 2398 is star number 2398 in the Struve Double Star Catalog of Baltic-German astronomer Friedrich Georg Wilhelm von Struve

Friedrich Georg Wilhelm von Struve

Friedrich Georg Wilhelm von Struve was a Danish-Baltic German astronomer from a famous dynasty.-Life:...

. The astronomer's surname, and hence the star identifier, is sometimes indicated by a Greek sigma, Σ.

External links

• SolStation entry
• http://www.daviddarling.info/encyclopedia/S/Struve2398.html
• http://www.richweb.f9.co.uk/astro/nearby_stars.htm
• http://jumk.de/astronomie/near-stars/struve-2398.shtml
• Struve 2398 in Dra