What star revolves around Sirius and what star is Sirius?

Sirius is the star of Canis Major and the brightest star in the entire sky except the Sun.

Myths and legends: In ancient Chinese astrological theory, Sirius was the evil star of "the omen of the Lord's invasion". Qu Yuan wrote in "Nine Songs: Dongjun":

Raise a long arrow to shoot the wolf", using Sirius to compare the Qin State located in the northwest of the Chu State. In Su Shi's "Jiangchengzi", "he will hold the bow like a full moon, look northwest, and shoot the wolf", and use Sirius to compare the Western Xia that threatened the northwest border of the Northern Song Dynasty.

Sirius, whose apparent magnitude is only light-years from Earth, is one of the closest stars to Earth, twice the diameter of the Sun, and twice as massive as the Sun. The surface temperature is 10,500K

Companion Planet: Sirius is a binary star system. It also has a companion star, Sirius B, which is a white dwarf.

In the 19th century, astronomers observed Sirius' position and found that its self-motion was oscillating, so it should have an unobserved companion star, which was disturbed by the gravitational force of the companion star to change Sirius' position. However, it was not until 1862 that the existence of the companion star was confirmed through telescopes.

The companion star has a diameter of 12,000 kilometers, 10,000 times fainter than Sirius, a mass 98% of the Sun, and a surface temperature of 25,200 K; Due to the distance from Sirius, the former Sirius companion** has been the "patent" of the large telescope in the observatory, and until recent years it has been photographed by amateur astronomers. The Hubble Space Telescope measured Sirius B last year.

01 Sirius is a binary star system, both of which are relatively massive and not very far apart, equivalent to the distance from the Sun to Neptune. The more disadvantageous condition is that both orbital eccentricities are relatively large, so if there are planets orbiting them, they need to maintain the same orbital eccentricity as them, but this is almost impossible in reality.

Sirius is located in the constellation Canis Major, also known as Canis Major, about light-years away from us, with a mass about twice that of the Sun, but it is a binary star system, we often refer to Sirius A, and it also has a white dwarf companion star - Sirius B, the mass and the Sun are basically equal, but the volume is only as large as the Earth, it is the existence of this white dwarf that makes it extremely difficult for the Sirius system to exist habitable planets, and so far, astronomers have not found a planet in Sirius.

Since both of these objects are relatively large, they are in a state of orbiting each other, with the mass of Sirius A more than double that of Sirius B, and the distance between the two is not very far, equivalent to the distance from the Sun to Neptune. The more disadvantageous condition is that both orbital eccentricities are relatively large, so if there are planets orbiting them, they need to maintain the same orbital eccentricity as them, but this is almost impossible in reality.

What's more, if these two stars orbit around planets, then it is bound to be affected by the gravitational pull of these two stars at the same time, and its orbit will become very unstable, so under the influence of the gravitational pull of these two stars, the planets may collide with the stars, or they will be thrown out of the Sirius system by the gravitational pull of the two stars and become wandering planets.

Therefore, it is difficult for the Sirius system to have planets, but there is a more important reason, if there were planets in the Sirius system, they were probably destroyed more than 100 million years ago. Because Sirius B formed a white dwarf roughly 100 million years ago, and its predecessor star is about 5 times the mass of the Sun, at the moment of its supernova explosion, a large amount of material will be thrown out at a very fast speed, so the planets in this planetary system will also be blown away, and if there are planets located on the gamma rays emitted by it, then they will even be vaporized.

There are two stars next to the moon, Venus and Jupiter.

The low is Venus and the high is Jupiter. Venus is particularly bright because of its close proximity and its reflective atmosphere. Venus can reach equivalence at its brightest. Jupiter is large and reflective, and Jupiter just passed opposition two months ago.

The so-called opposition is when a planet moves in the opposite direction to the Sun, when the planet reaches its brightest. Jupiter is also above -2 magnitude when it is at its brightest. They are the brightest stars in the sky, all larger than Sirius.

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When the constellation Orion, the representative of the winter constellation, climbs to the highest peak of the zenith, at the lower left of it, a cluster of bright stars can be seen shining above the southeastern horizon, this pile of bright stars is the hunting dog that is with Orion when he is out hunting, Canis Canis is the big dog that you should easily find, because the brightest star that appears in the sky at night, Sirius, is located in the constellation Canis Major.

Sirius is the brightest star seen by the naked eye after the Sun, and its original Latin name is Sirius, which comes from the Greek word for splendid one. Sirius is so bright, almost ten times brighter than the so-called first-magnitude star, even in the famous summer triangle, for the brightest zero-magnitude Vega, the brightness is only a quarter of the wolf, which shows how bright Sirius is, the reason why Sirius is so bright is not only because its diameter is twice that of the sun, resulting in 30 times the amount of light of the sun, but also because it is only light years away from us, the sixth closest star to the sun, bright and close, it makes Sirius become the night sky Ten thousand darkness, light shine Big star too.

When we look at Sirius, the brightest star in the sky in the winter night sky, we will find that it emits an intense blue-white light, which shows that its surface temperature is as high as more than 10,000 degrees, and astronomers analyze the spectrum of Sirius** its physical condition, and believe that it was born about 500 million years ago, compared to our sun, which was born 4.6 billion years ago, Sirius can only be regarded as a "kindergarten".

In 1844, the famous German astronomer Bessel, who compared the trajectory of Sirius between 1755 and 1843, found that it was not in the usual linear motion, but in the form of a wave curve. In 1862, the famous American telescope manufacturer, Clarke, when he finished grinding the largest 18-inch (45 cm) refractor at that time, observed Sirius to test its optical effect, and found a small spot of light next to Sirius. Astronomers calculated according to the displacement of Sirius that the mass of this companion star should be very large, but the brightness is so small, it seems that something is wrong, and then analyzing its spectrum, we suddenly realized that it is actually a very small diameter, extremely dense abnormal star, a further study of this companion star, showing that its mass is a little larger than our sun and is doubled!

Winter night in the southeast of Orion, is the brightest star in the whole day except for the sun, easy to find, this section did not see, about 9 o'clock in the evening should be in the southeast sky, very bright, twinkle and flash, if not flash is not.

In which direction is Sirius? What does it look like?