How many stars are there in Ursa Major?

Three to six or seven stars gather together under the action of gravity, and the star system formed in this way is called star gathering. A system consisting of three stars can also be called a triplet, a system consisting of four stars is called a tetrad, and so on.

The constellation Ursa major is a famous gathering star. First of all, it is a visual binary star that can be distinguished by the naked eye. The main star, Ursa major Z, is a secondary star; Companion Ursa major, No.80, a fourth-order star, is Z 1 1 min from Ursa major (1 min is one sixtieth of 1 min on the circumference). Years of observation show that there is a mechanical connection between the two stars. Observing the Z star of Ursa Major with a telescope, we can find that it is a visual binary star, with two sub-stars separated by 14 seconds (1 second is one sixtieth of 1 minute), the main star of Ursa Major z 1 star 2.4, and the companion star z2 of Ursa Major 4.0. Ursa major z 1 is the earliest discovered spectral binary star. The companion star of Ursa major z 1 revolves around the main star for 20.5 days, and the distance from the main star is only about 1/3 of the distance from the earth to the sun. Later, it was found that z2 in Ursa Major and 80 in Ursa Major are also split binaries. So, this multiple star is Liuhe star.