The details of Capella

The basic data constellation Auriga apparent magnitude is +0.08 +0.76/+0.9 1 right ascension (J2000) 05h16m41.4s right ascension (J2000). +45 59' 53 "Centennial Right ascension +0".734 Centennial Right ascension -42".4 1 is 10.2/8.5 times the mass of the sun, and its absolute magnitude is 42.2 0.5 light years away from the Earth+0.14/. 2.56 times star classification G8III/G0III luminosity 78.5/77.6 times surface temperature 5270/5900 K color index (B-V) +0.80/? 0.25 color index (U-B) +0.45 metal content 40% solar brightness ranks sixth in the whole day. Capella is the brightest alpha star in Auriga, and its brightness is second only to arcturus and Vega in the northern hemisphere. Of all the brightest stars, it is closest to Polaris. Because it is close to Polaris, for most observers in the northern hemisphere, it stays above the horizon for more than 20 hours in 24 hours a day and can be seen all year round. Capella rises from the north-northeast direction every day, reaches the highest point north of zenith, slowly turns to the northwest, and finally falls to the north-northwest direction. Through spectral observation, it is found that Capella is composed of two hot planets with the same size and very close distance. They are all very large and rotate with each other at an amazing speed. This binary star, which can only be clearly distinguished by spectroscopic instruments, is called "spectroscopic binary star" in astronomy. The color of Capella's main star and companion star is similar to that of the sun, showing light yellow, and their surface temperature is also roughly the same as that of the sun. But Capella's two stars are bigger than the sun, and they are a pair of yellow giant stars. The diameter of the main star is more than 12 times that of the sun, and the amount of light emitted is more than 100 times that of the sun. Capella Capella is very big, but its atmospheric density is very small, only 1/40 of the solar atmospheric density, so it is a weak fat man. Capella is about 40 light years away from us. At present, Capella is leaving us at a speed of 30,000 to 40,000 meters per second.