Three stars line up in a straight line. What star is it?

Three stars in a straight line are the three stars in the middle of Orion.

On a sunny day, Noguchi can see Orion as long as he looks up. It consists of a row of three stars and four bright stars in the periphery. It is imagined as a hunter who bows and shoots arrows. The most obvious sign of Orion is three stars with the same brightness and equal distance. These three stars are called Orion belt.

In ancient times, China was called Betelgeuse I, Betelgeuse II and Mingtaka. In China, people call these three stars Fuxing, Luxing and Shouxing.

The extended data are 1, Betelgeuse, Orion zeta, all-sky 3 1 bright star, apparent magnitude 1.77, absolute magnitude -5.9, and distance 1300 light years. It is an O9.5Ib blue Supergiant star. In fact, it is a triplet composed of three satellites, with the apparent magnitude of satellite A being 1.9, satellite B being 4.0, and satellite C being 9.9, etc. The angular distance between A and B is 2 ".3, and the angular distance between A and C is 57" .6.

Betelgeuse is the 30th brightest star in the whole night sky and the 4th brightest star in Orion. It is a B0Ia blue Supergiant star and one of the brightest stars known. If you observe Betelgeuse from the earth, you will find that it is located in the belt of Orion, about 1342 light years away from the earth.

3. Mintaka (Δ ori/Δ Orion) is the star of Orion, and its common name is Mintaka (from Arabic? Men? Aqah, meaning "region"), is about 900 light years away from the earth. It forms Orion belt with Betelgeuse I and Betelgeuse II. Observers in the northern hemisphere face south and can see that Akisaka is on the far right side of the belt when Orion approaches the zenith.

Baidu Encyclopedia-Orion Belt