What is Kaiyang in the Big Dipper?

In ancient China, the seven bright stars in Ursa Major were considered to be in the shape of a spoon, which is what we often call the Big Dipper. The second star on the spoon handle is Zeta Star, which was called Kaiyang Star in ancient China. If you look carefully, you will find a dark star near it. This dark star is called Ursa Major 80. The ancients saw that it was always close to Kaiyang Star, just like the patron saint of Kaiyang Star, so it was called Fu. Kaiyang star and auxiliary star form a pair of visual binary stars. Kaiyang is actually a cluster of seven stars.

Kaiyang: One of the Big Dipper, located in bucket handle, between Yuheng and Yaoguang.

Constellation: Ursa Major ζ (Kaiyang, Wu Quxing)

Western name: Mizard

Bayer letter: zeta Ursae Majoris

Value: 2.40

Location (year J2000.0):

Right ascension:/kloc-0 13H23M55.55s

Declination:+54 55' 31.4 "

Height: 35 17' 26 "

Azimuth: 043 1 1' 00 "

U2000: Chart 48, Volume 1

Distance: 78.2 1. 1 light year

Brightness: 60.2 1.7 x solar luminosity.

Kaiyang is a famous binary star. Its companion star (Xiong 80) was named "Fu" in ancient China, with an angular distance of 1 1'49 "and a brightness of 3.95. The ancient army used this pair of binary stars to test soldiers' eyesight, which was used by both Chinese and foreign armies.

"Book of Jin. Tianwenzhi said that Beidou is too north, its pivot is the sky, its grace is the earth, its strength is the time, its balance is the sound, its day is the law, and its light is the star.