What constellation does Polaris belong to?

Polaris is the brightest star in Ursa Major, so it is also called Alpha Star in Ursa Major. Ursa minor is a small constellation, located near the north celestial pole, so its name is also related to Polaris.

Polaris has a very special position in the sky. It is almost at the north pole of the earth, so its position looks very stable when observed on the earth. Its exact position is determined by other stars in Ursa minor, which form a unique shape in the sky around Polaris, similar to the outline of a bear.

Polaris is a very old star. Its age is about 654.38+0 billion years, older than the sun. Its brightness is very stable, and its spectral type is ordinary star, belonging to a star with a magnitude of +2.04. The radius of Polaris is about 1/5 of that of the sun, and its mass is about 2.5 times that of the sun.

In a word, Polaris is the brightest star in Ursa minor, which has a special geographical location and ancient and stable characteristics. Polaris is also an important reference for navigation and observation, which is of great significance to the study of astronomy and cosmology.

The position of the north pole star

Polaris is a bright star in the northern part of the sky, very close to the north celestial pole, almost facing the earth axis. Seen from the northern hemisphere of the earth, its position is almost unchanged, so it can be used to identify the direction. Because of the rotation of the earth, Polaris is just on the axis of celestial rotation, so it is relative to other stars. However, the Polaris is not completely at the center of the north celestial pole. In fact, it is circling at a very slow speed, and looks unchanged compared with other stars.

Polaris is motionless, because the earth revolves around the earth's axis. Polaris is very close to the north extension line of the earth's axis, so when you look at the sky at night, Polaris is almost motionless, with its head tilted to the north, so it can indicate the north.

Although the tilt direction of the earth's axis will change because the earth revolves around the sun all year round, the distance between Polaris and the earth is much larger than the radius of the earth's revolution, so the change of the earth's axis brought about by the earth's revolution can be ignored. So all the year round, we see that the position of the North Pole star seems to be fixed in the north. In fact, we just can't observe the subtle changes with the naked eye, and we feel that the earth axis always points to Polaris.