I wonder where Sirius is in the sky.

Sirius's main system consists of a blue-white-blue dwarf and a blue-white dwarf, and its center of mass is about 8.6 ly away from the Earth. Sirius is the brightest star in the whole day except the sun, but it is darker than Venus and Jupiter and brighter than Mars most of the time.

Sirius and its companion star orbit each other with great eccentricity. Period of revolution is about 50 years, with an average distance of about 20 AU. Although the bright star shines brightly, it is not difficult to see the companion star with a magnitude of 8.44 with a large telescope. The companion star has the same mass as the sun, but its radius is only the size of the earth, and its density is much larger than that of the sun, with an average density of10.7kg/m/m? , the first discovered white dwarf.

Sirius's apparent magnitude is about-1.46, which makes it the brightest star in the night sky, almost twice as bright as the second brightest old star. However, it is still not as bright as the moon, Venus or Jupiter. Mercury and Mars are occasionally brighter than Sirius. Sirius can be observed almost anywhere on earth except people who live north of 73 north latitude.

Sirius observed in some cities in the north of the earth will not rise very high. For example, Sirius in St. Petersburg will only rise to 13 on the horizon. Because Sirius's declination is about-17, it is the arch star of 73 south latitude. At the beginning of July, Sirius can be seen from the place where the sun sets and rises before sunrise in the southern hemisphere.

Under proper environmental conditions, Sirius can even be seen with the naked eye when there is the sun. Of course, the sky must be very clear, the altitude of the observation site must be very high, the sun should be low on the horizon, and Sirius should be overhead, which is very rare.

Baidu Encyclopedia-Sirius