It ranges in apparent magnitude from 1. Bellatrix was once thought to belong to the Orion OB1 Association of stars that share a common motion through space, along with the " Orion's Belt " stars Alnitak , Alnilam and Mintaka. However, this no longer believed to be the case, as Gamma Orionis now known to be much closer than the rest of the group. It is not known to have any stellar companions. A search for nearby companions failed to conclusively find any objects that share a proper motion with Bellatrix.
Three nearby candidates were all found to be background stars. It is rapidly depleting its hydrogen fuel and has started to evolve off the main sequence on its way to becoming a true giant. It is expected to become an orange giant within a few million years, and has already developed a gaseous shell that signals the start of its transformation. At its present 8. Proper Motion Dec Color Index B-V Flamsteed designation 24 Orionis. Henry Draper Catalogue HD Hipparcos Catalogue HIP FK5 Catalogue General Catalogue of Variable Stars It is old enough to consume its hydrogen supply at its core and evolve away from the main sequence into a giant star.
Bellatrix has very high temperatures. On average, it is almost 4 times hotter than our sun at Because of its high temperatures, the star has a blue-white hue that occurs with B-type stars.
This star is a spectral type B2 III with a variable apparent magnitude between 1. Its absolute magnitude is Bellatrix is a massive star with about 8. Its name is derived from Latin and it literally means female warrior. Bellatrix is one of the four stars used in celestial navigation.
The other stars are Rigel , Betelgeuse , and Alnilam. It is one of the most easily recognizable stars, best seen in December and January. The star can be viewed with the naked eye.
0コメント