What are the characteristics of the small dog constellation?

Canis minor is located south of Gemini and north of Canis major, on the edge of the Milky Way. Canis minor is a small constellation in which there are few stars visible to the naked eye. The alpha star in the constellation (called Nanhesan in China) is 1 bright star. Nanhesan and Orion. Betelgeuse and the big dog Q (Sirius) form a huge equilateral triangle, which hangs conspicuously in the winter night sky. This is the famous "Winter Triangle".

The bright star opposite Sirius across the Milky Way is Nanhesan. It is the brightest star in the constellation canis minor. The little dog constellation is a small constellation with an area of 138 square degrees, 7: 04 to 8: 09 right ascension and 0 to 13 right declination. There are 32 stars in the constellation with brightness greater than 6, among which puppy α is 0 and apparent magnitude is 0.38. There are 1 third-class stars, which are puppy beta stars and 29 apparent magnitude stars. , the rest are below 5. Canis minor is equivalent to the South River in China's star official system. In China, puppy α is called Nanhe Ⅲ, puppy β is called Nanhe Ⅱ, and Nanhe Ⅰ is puppy ε, yes 1 499 and so on. Every March 1 1 at eight o'clock in the evening, the puppy goes to heaven. Its Latin name is canisMinoris, which means puppy, abbreviated as CMi.

According to ancient Greek myths and legends, Zeus, the god of gods, found a puppy to make Sirius (Canis Canis) not live alone in the sky. This puppy is Canis minor, which shines in the north of Canis major. Together with Sirius, it runs in the sky with its master Olivier.

There is another legend in ancient Greek mythology. Ackert Weng, the son of King Cadmus, is a famous hunter. He has many hounds, the most fierce of which is Moranpus. Ackert Weng and his friends often take hounds to hunt in the mountains. There is a valley surrounded by pine and cypress in the mountain, and there is a cave at the end of the valley. The spring water flowing out of the cave gathers into the pond in front of the cave, which is a holy place for the moon and Artemis (called Di Anna in Roman mythology) to rest. Al themis often bathes and refreshes himself in the pool after a day's hunting. One day, Ackert Weng got lost and strayed into the valley. As soon as he appeared at the mouth of the cave, he immediately caused panic and anger among the female immortals who were taking a bath. The goddess of the moon lifted the pool water and splashed it on the uninvited guests' bodies and faces. Suddenly, Ackert Weng grew a pair of antlers on his head, his neck was elongated, his hands became hooves, his arms became long legs, and his whole body grew a layer of spotted fur. He was frightened and ran away. As soon as the hound he brought saw this, he pounced on him fiercely, and Morampus jumped on his back and killed him. Themis's anger subsided, and he lifted the hound that accidentally injured his master to the sky and turned it into a puppy.

Nanhe San in Canis Canis, Sirius in Canis Canis and Betelgeuse in Orion form a big triangle, which is called the winter night triangle and stands out in the winter night sky. The western name of Alpha Canis minor is procyon, which means "earlier than the dog" because it is farther north than the dog star (Sirius) and rises above the horizon earlier than Sirius. Nanhesan is similar to Sirius in many aspects, with a distance of 1 144 light years, only slightly farther than Sirius (85 light years); The radius is 17 times that of the sun, larger than Sirius (16 times), and the mass is 174 times that of the sun and smaller than Sirius (2 14 solar mass). Nanhesan is a P5 type subgiant, and its surface temperature is also lower than Sirius (9970 kHz), which is 65 10 kHz. The absolute magnitude is 264, and the luminosity is 69 times that of the sun, which is lower than that of Sirius (142, etc. , 2 1 solar luminosity). Similarly, Nanhesan is also a binary star, and its companion stars are 1 white dwarf, apparent magnitude 108, absolute magnitude 13 1.

β (Nanhe II) is a B8-type main sequence star with a distance of 140 light years and an absolute magnitude of -02. Its luminosity is 95 times that of the sun and its radius is 15 times that of the sun. Its western name is Gomeisa, originally Arabic, which means "eyes full of tears". It is a gamma-ray burst star in Cassiopeia, and its brightness varies from 284 to 294.