Beihe II

Hexagram of Gemini

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Beihe II（ Castor ）I.e Gemini α， It is the 23rd bright star in the whole day, Apparent magnitude About 1.58, etc, Absolute magnitude 1.14, etc. Beihe'er is actually a Hexagram 。 It and Beihe III It is regarded as a pair in many national myths.

Chinese name: Beihe II
Foreign name: Castor
Alias: Gemini alpha 、 Gemini 66 、 Gemini YY 、 Gl 278 、 HR 2891 、 BD+32 1581/2 、 HD 60178/60179 、 GCTP 1785.00 、 LTT 12038 、 SAO 60198 、 FK5 287 、 ADS 6175 、 HIP 36850
Classification: Stellar system
Apparent magnitude: 1.58 etc

Absolute magnitude: 1.14 etc
Right ascension: 7:34:35s
Declination: +31°53′18″
Distance from ground: About 49.8 light years
Constellation: Gemini
radial velocity: 5.2±1.2 km/s
Parallax: 65.50±1.10 mas

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Stellar system

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Beihe'er is one Hexagram , with the naked eye, it is 1.6 grade blue white fixed star A pair of white and blue stars with 1.9 and 2.9 degrees can be found through telescope observation, forming physics Konductra The orbit period is 470 years. In fact, these two stars are both Spectroscopic binary A star of class 1.9 is a star of class 1.8 and 2.3, a star of class 2.9 is a star of class 2.6 and a star of class 2.3. A star of class 9 can be seen with a small telescope Long distance companion 。 It is composed of 6 stars, 50 light years away from the earth, and is famous Aggregate star System.^[1]

physical characteristics

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Beihe'er was discovered as a binary star in 1678, and the apparent magnitude of the two members was 2.8 and 2.0 respectively. The distance between the two is about 6 ", and the circle period is about 467 years. Each member of Beihe'er is a spectroscopic binary, so Beihe'er is actually a four-star system. Beihe'er also has a distance of 72" Dark companion , they have the same parallax And by itself; This companion star is an eclipsing binary system, Photoperiod Slightly less than 1 day. It's one of the few known members M-type dwarf Of Eclipsing binary system 。 So Beihe II can also be regarded as a six star system., Six independent stars are bound together by gravity. Member C's Variable star It is classified as Gemini YY.^[1]

Etymology and culture

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stay Western Myth Middle, Castor and Beihe III Pollux is heavenly“ Gemini ”； Gemini （Gemini， Latin "Twins") also got its name. The English meaning of Castor is“ beaver ”, but actually the name means Zeus And Leda's twin sons Castor and Pollux. Beihe II also has an Arabic name Al-Ras al-Taum al-Muqadim , which literally means "the head of the twin brother". The Chinese believe that Beihe'er belongs to "Yin", one of the basic elements of all things.

Introduction to Stars

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Beihe II（ Gemini α star, Castor, or "equestrian master") Latin In the middle, Beihe'er is one of the twin brothers of the Twin Institute, named Cass Tor He is an equestrian expert.

Beihe II (2 sheets)

Beihe II: 6 merging stars. A pair of blue and white stars with a class of 1.6 can be seen with the naked eye. A pair of blue and white stars with a class of 1.9 and 2.9 can be observed with a telescope, forming a physical binary star with a cycle of 470 years. In fact, these two stars are both spectroscopic binary stars. A star with a class of 1.9 is a star with a class of 1.8 and 2.3, and a star with a class of 2.9 is a star with a class of 2.6 and a star with a class of 2.3. With a small telescope, you can see a distant companion star of magnitude 9. It is composed of six stars, all 50 light years away from Earth. It is the most famous star gathering system in the universe.

Relevant information

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·Although in Bayer designation In the middle, Beihe'er is named "α" star, but Apparent magnitude Up, "β" star（ Beihe III ）But brighter than it.

·Hundreds of years ago, according to the star map at that time, Beihe 2 was brighter than Beihe 3, so Beihe 2 was called Gemini Alpha star, called Beihesan as beta star. About the 18th century, the brightness of Beihe 2 and Beihe 3 tended to be the same. Now Beihe II is darker than Beihe III, and scientists speculate that Beihe II may have a cycle of several hundred years Eclipsing variable star 。

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