In 2020, the sky forecast is 65438+1On October 20, will Cygnus χ reach its maximum brightness?

2020 is a new year for us and a new beginning for everything. The astrology in 2020 is also brand-new. As one of the three major meteor showers in the northern hemisphere, the quadrant meteor shower made its debut at the beginning of the year, which is a good start. Next, the constellation knowledge will give you a detailed introduction to the maximum brightness of Cygnus χ in 654381October 20!

In 2020, it is predicted that the maximum brightness of Cygnus χ will reach 65438+ on1October 20th, and there is a long-period variable star Cygnus χ in the middle of its long neck, which changes once every 408 days. Cygnus χ is a Milla variable star, an S-shaped star in Cygnus, about 600 light years away from the solar system. The χ luminosity of Cygnus is the largest change of apparent magnitude among all pulsating variables. Its apparent magnitude varies from bright to 3.3 visible to the naked eye to weak to 14.2 that can only be seen with a telescope with a diameter of 30 cm, and its brightness changes by more than 10000 times!

Cygnus χ is an asymptotic giant branching star, a bright red giant with a low surface temperature and approaching the end of life. When it brightens to 3~4, it can be seen by naked eyes, even if it is 5~6, it can be found with binoculars.

Cygnus is one of the northern constellations. At 20 o'clock on September 25 every year, the swan constellation rises to the sky. Summer and autumn are the best time to observe Cygnus. Interestingly, the rise and fall of Cygnus is really like a flying swan: it rises obliquely from the northeast to the sky, and when it reaches the zenith, its head points to the west. When it moves to the northwest, it turns head down, tail up and disappears on the horizon. Cygnus is completely immersed in the white Milky Way, standing on both sides of the Milky Way with Aquila and Lyra. The three main stars (α star) of these three constellations, namely Altair, Vega and Tianjin IV, form a big triangle (summer triangle). There are 19 1 stars in the constellation with visual magnitude greater than 6, and 22 of them have brightness greater than 4. Therefore, in the summer night sky, although the Milky Way is like a veil and full of stars, it is not difficult to find Cygnus, which can still shine in the Milky Way.

Appearance features The main stars of Cygnus are arranged in a big cross, so it used to be called the "Northern Cross". It's easy to imagine the cross as a swan. The long vertical fork is the swan's long neck, and the horizontal fork is the swan's wings.

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