40 Eridani
40 Eridani, also known as ο2 Eridani ( Omicron2 Eridani ) or Keid known ( from the Arabic word القيض, DMG al - Qaid, eggshell ' ), a triple-star system, less than 16.5 light years away from Earth.
The system is located in the constellation Eridanus, and was identified by William Herschel as a double star system in the year 1783. Otto Wilhelm von Struve in 1851 discovered that one of the components is a double star system itself. 1910 Component B was identified as a white dwarf, since this star, despite its low luminosity the spectral type A belongs. This was the star of the first compact dwarf star, which was discovered.
Generally
40 Eridani A is an orange main sequence star of spectral type K1 fourth size. He has an approximately 15 % lower mass than the Sun and about one- third of its luminosity. Like his two companions he is between four and twelve billion years old.
40 Eridani B, a white dwarf ninth size ( spectral DA4 ), has about half the mass of the Sun. Since he has already left the main sequence phase behind it, it can be assumed that this star was the most massive component in development of the system. After leaving the main sequence to eventually become a white dwarf, he came from a large part of its original mass.
40 Eridani C is a red dwarf of spectral type M4.5 eleventh size with Ve and is one of the flare stars. As Variable he is called DY Eridani.
The components B and C, the primary star orbit in approximately 400 AE within about 8000 years. Close the pair B and C traveling on an orbit having a radius of about 35 AU, a revolution takes about 252 years.
40 Eridani in fiction
In the fictional Star Trek universe 40 Eridani A is the sun of Spock's homeworld volcano. Although this was never mentioned directly in film and television, refer to both the licensed book Star Trek: Star Charts and Star Trek creator Gene Roddenberry himself 40 Eridani as the star revolved around the volcano. In addition, is Commander Tucker, one of the main characters of the television series Star Trek: Enterprise, from a distance of 16 light years between volcanic and earth, which is about the actual distance of 40 Eridani.