HIP 12961 [SEP] constellation
HIP 12961
HIP 12961 is a dim red dwarf star located approximately 75 light-years away in the constellation of Eridanus. It is one of the largest and brightest M class red dwarf stars known. In 2009 an extrasolar planet orbiting this faint star has been announced.
Planetary system.
HIP 12961 b is an extrasolar planet which orbits the star. This planet has at least half the mass of Jupiter and takes over eight weeks to orbit the star at a semimajor axis of approximately 0.25 AU. The planet's
are very-low-mass stars. As a result, they have relatively low pressures, a low fusion rate, and hence, a low temperature. The energy generated is the product of nuclear fusion of hydrogen into helium by way of the proton–proton (PP) chain mechanism. Hence, these stars emit little light, sometimes as little as that of the Sun. Even the largest red dwarfs (for example HD 179930, HIP 12961 and Lacaille 8760) have only about 10% of the Sun's luminosity