What constellations are there in winter?

The starry sky in winter is magnificent. Orion is the center of the winter sky. The two brightest stars in Orion are Betelgeuse in the lower right corner of the quadrangle and Betelgeuse in the upper left corner. Betelgeuse is a very bright star, the brightness is about 60,000 suns, the distance is about 900 light years, and the brightness is 0. 1. If it is as close as Sirius, the luminosity can reach-10, which is 1/5 of the full moon. Its surface temperature is about 12000 degrees, and its diameter is about 35 times that of the sun. Betelgeuse has a companion star, which is a binary star. Its brightness is 150 times that of the sun, and its luminosity is 6.8. Betelgeuse is a big star, 800 times the diameter of the sun. Its luminosity will change, from 0.4 to 0.9, sometimes reaching 0. 1, etc. With a surface temperature of about 3500K, it is an ancient red giant that shines in the winter night sky.

Betelgeuse is located in the upper right corner of the quadrangle. The luminosity is 1.64, the brightness is about 2200 times that of the sun, the diameter is 13 times that of the sun, and the distance is about 300 light years, which is far from the three bright stars that make up Orion's belt, all exceeding 1000 light years. But their brightness is more than 20000 times that of the sun, so they are still dazzling stars in the eyes of the earth. The luminosity of Betelgeuse is 2.06, the distance is about 1500 light years, the surface temperature is 27000K, and the diameter is about 2 1 times that of the sun. It is not much smaller than Betelgeuse, but it is far away and looks a little dark.

Orion's belt consists of three stars, Betelgeuse, Betelgeuse and Betelgeuse.

The luminosity of Betelgeuse is 1.77, the distance is 1400 light years, the surface temperature is 30,000 K, and its diameter is about 19 times that of the sun. The luminosity of Betelgeuse is 1.70, the distance is 1350 light years, the surface temperature is 29000K, and its diameter is about 20 times that of the sun. Mintaka has a luminosity of 2.20, a distance of 1200 light years, a surface temperature of 30,000K and a diameter of about 18 times that of the sun. "Three stars in the sky" in the Book of Songs refers to these three stars.

Orion has another group of three stars. These three stars are all four stars, arranged in the south side of the belt in the north-south direction, like swords hanging on the belt. The famous Orion M42 nebula is located in the center of these three small stars. Orion belongs to the newly born young planet except Betelgeuse, Betelgeuse and Betelgeuse. Its surface temperature is very high, emitting blue and white light. It is these high-temperature planets that emit ultraviolet rays, making the surrounding gas glow freely, forming the colorful and dazzling Orion Nebula. The luminosity of M42 is about 5. There is an area in this nebula that is pregnant with new stars. It emits strong infrared radiation and is said to be available in ten years. Next to the leftmost part of Samsung is the Horsehead Nebula. When the three-star line extends to the lower left, you can meet the brightest star in the whole day: Sirius. It is the alpha star of Canis Canis major, with the apparent magnitude of-1.46, the distance of 8.65 light years, the diameter of 1.68 sun, the actual luminosity is 25 times greater than that of the sun, and it is blue and white with a surface temperature of 10000 degrees. It has a companion star, a white dwarf, with a diameter of 48,000 kilometers (as big as Neptune), the distance from Sirius is as far as Neptune and the sun, the period is 50 years, the mass is similar to that of the sun, the brightness is only 1/360, and the density is 30,000 times that of water (because the atoms that make it up almost lose their peripheral electrons, and the density is very high).

Extending from Samsung to the upper right is the bright red star Bi Su Wu. Taurus is Gemini in the southeast, Cancer in the east and lion head in the east. To the southwest of Orion is the long, huge but very dim Bojiang River (Bojiang River, located in northern Italy, where Apollo killed his illegitimate child felton by lightning). Just south of Orion is the sky map, that is, the constellation Pigeon. In the south, the alpha star Laonian (magnitude -0.72, distance 195.6 light years) in Carina is the second brightest star in the whole day. 13000 years later, when Vega becomes the north star, it will become invivo. The Pleiades cluster on the back of Taurus is an excellent open cluster, consisting of about 500 stars, commonly known as Seven Sisters, and it is one of the popular candidates for the hometown of aliens.