The Pleiades cluster is located in Taurus and consists of seven stars. It is often called the Seven Sisters Cluster. It is one of the brightest open clusters recently. The running moon passes through the surface of the Pleiades cluster, blocking people's view of the Pleiades cluster, and is called the "moon mask". When the moon passes through the Pleiades, we will see the member stars in the Pleiades disappear or appear one after another, which is quite spectacular.
In the clear night sky, we can see the Pleiades star cluster with naked eyes, and we can also watch it with home binoculars. It is understood that the duration of the Pleiades cluster on the moon is expected to be 1 ~ 2 hours. Experts remind the public that it is best to choose a place with no dust, good air quality and little light influence for viewing. There are too many lights in the city at night, so it is more suitable to use rural and suburban areas.
Stars form one of the most famous clusters of galaxies in the Pleiades cluster in Taurus. In ancient China, bright stars were listed as Pleiades. Messier's number is M45. There are many legends and myths about it. It is also called "Seven Sisters Cluster", but only six of them can be seen by normal naked eyes, and people with excellent eyesight can see seven or more stars.
The apparent diameter of the Pleiades cluster is about 2, including the number of stars above 100, the distance to 128 parsec (4 17 light years), and the true diameter is about 4 parsec. The star name, photoelectric visual magnitude and MK spectral classification of the brightest six stars are: Taurus 17 (Pleiades I), 3.7 1, B6 Ⅲ; ; Taurus 19 (Pleiades II), 4.3 1, B6 IV; Taurus 20 (Pleiades IV), 3.88, B7 Ⅲ Sn; Taurus 23 (Pleiades V), 4. 18, B6V Taurus η (Pleiades), 2.87, B7 Ⅲ; Taurus 27 (Pleiades VII), 3.64, B8 Ⅲ.
These clusters are spinning fast. The effective surface temperature of Pleiades in blue giant is about 13500K, and the total radiant brightness is about 2200 times and the radius is about 8 times that of the sun, but the equator rotates for less than 3 days. Pleiades VII is a spectral binary star with an orbital period of several years. 7% of the Pleiades are binary stars with orbital periods less than 100 days. The famous shell star Taurus 28 (that is, Taurus BU) is located in the Pleiades cluster. There is also a shield delta variable in this cluster. More than 460 Yao stars have been found in the direction of the Pleiades. There are no red giants in this cluster. The nebula near the bright stars of the Pleiades cluster seen in the photo is called NGC 1432, which is a reflection nebula formed by the reflection of interstellar dust particles and scattered starlight. This may be the interstellar matter left over from the formation of the Pleiades, but it is more likely to be the matter encountered by the Pleiades during their movement. The age of the Pleiades is estimated at about 50 million years.
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