In ancient China, the so-called "Fire" star was a summer constellation.

Antares, the alpha star of Scorpio (the main star of Scorpio), is the loneliest first-class star in the whole day, but there are many bright second-class stars nearby. China, also known as the fire in ancient times, is the heart of the oriental black dragon for seven nights, which is used to determine the seasons. "Fire in July" means that Mars is heading west and the weather is cold. Antares is the15th bright star in the whole day, which is a visual binary star. The magnitude of the main star is 1.2, and the red giant with M 1I is 10900 times the brightness of the sun. The companion star is a blue dwarf star with brightness of 5.4 and angular distance of 3 ". The synthetic magnitude is 0.96 and the absolute magnitude is -5.28. The star belongs to the Scorpio-Centauri Association, so the known distance is 430 light years. Modern astronomy is called "Introduction to Scorpius Alpha Star". This is a red Supergiant star. It is a semi-regular variable star with obvious light variation and forms a visual binary system with a blue main sequence star. Antares or radio sources.

Because the brightness and color of Antares are very similar to those of Mars, and the orbits of both stars are on the ecliptic, when Mars runs to Scorpio, two red stars shine in the sky, so Antares is named. In ancient Persia, Antares, Bi Suwu, Xuanyuan XIV and Beiluoshimen were collectively called the four heavenly kings.

Antares is a red Supergiant star, and its companion star is B4V. The main star is one of the largest known stars in the sky. In the past, people thought that the diameter of the main star was 600 times that of the sun, but according to the latest measurement results, the diameter of the main star was 700 to 900 times that of the sun, and its radiation energy was 80,000 times that of the sun. The main star has undergone a lot of evolution, and the current surface temperature is about 3600K, so most of the energy it radiates is concentrated in the infrared band. Low temperature also makes it the reddest star in 1 star. At present, the main star is 15- 17 times the mass of the sun, and it is the heaviest star in the Scorpio-Centauri Star Association. According to its material loss rate, astronomers predict that the star in the main sequence stage is 25 times the mass of the sun and belongs to the hot O star. There is a reflection nebula around antares. Normally, the reflection nebula is blue, but due to the intense red light of Antares, the nebula appears rare red.

The companion star of Antares has a visual magnitude of about 5.4, which is a blue main sequence star 5-7 times heavier than the sun. Although the contrast with the main star is very dim, the companion star is actually about 230 times brighter than the sun. Because it is too close to the main star, it is very difficult to observe the companion star, so it lacks reliable physical parameters.

Antares, also known as Fire, Shangxing, Tiansikong (Antares are in the base, Fire is in the heart, so it is called Fire): It corresponds to the four hotels of Bianfang, Fangxin and Weiwei, which are divided into Song (both in Shangqiu City, Henan Province) and Yuzhou according to the time of each country, probably between eastern Henan and Shandong, Jiangsu and Anhui. The corresponding is the Heart Moon Fox, and the Star God is Kou Xun. Notes on the Thirteen Classics. Shi Mao. Xiaoya. April: Summer in April, summer in June. "Scapharca subcrenata" in the Western Han Dynasty said: Lu (sound cú), go also. June (the calendar of Xia Dynasty) is equivalent to the current lunar calendar. Build yin, build ugliness and build children, which are collectively called three positive), and Mars (that is, Antares and Alpha of Scorpio Sco) is in full bloom. Zheng Xuan wrote in the Eastern Han Dynasty that it was too late to start. The long summer in April, in June, is the beginning of the heat. It takes a while for people to do evil.

At eight o'clock in the evening in mid-July, looking to the southeast, there is a low red star on the horizon. This is Antares, through which you can find many bright stars in summer.

The west believes that antares is the heart of scorpions. In Zhuan Xu more than 4,000 years ago, China set up an official post of Huozheng, responsible for observing this star. In China, it is considered as one of the 28 lodgings of Dragon Heart and Heart, and the fifth of the seven lodgings of the East (Angle, Health, Edge, Square, Heart, Tail and Basket). The heart is a fire, a star to wait for in the first month of summer. Often used with residential accommodation to discuss "the central government controls all directions" The dragon's waist where the kidney is located is the source of metabolism, so it can't be taken lightly, so it is more fierce.