Rukbat

Stars in Sagittarius

Rukbat , namely Alpha Sagittari, is Sagittarius A star in the. Its traditional name is Alrami and Rukbat 。 Tianyuan III is a blue B shape dwarf star It doesn't look very bright in the sky, Apparent magnitude Is+3.97. However, this is due to its long distance. In fact, the temperature of this star is twice that of the sun, its mass is much larger than the sun, and its brightness in the visible light band is about 40 times that of the sun. According to the excessive emission of infrared ray, it is speculated that it may have a fragment disk, similar to Vega 。 It's not clear why Johann Bayer This star is designated as alpha star, not Sagittarius ε or Sagittarius σ. This makes some ancient star maps occasionally depict two stars, Alpha Sagittarius and Beta Sagittarius, which are much brighter than they actually are, because they are in the Northern Europe It is invisible, nor can it be seen in Tainan.^[2]

Chinese name: Rukbat
Foreign name: Rukbat
Alias: Sagittarius alpha
Classification: fixed star
Diameter: 2.49 times the diameter of the sun
surface temperature: 11573 K^[3]
Apparent magnitude: 3.97 etc^[3]

Absolute magnitude: 0.39 etc^[3]
Right ascension: 19:23:53.2s
Distance from ground: 169.79 light years^[3]
Epoch: J2000.0
Observation: Visible to the naked eye
constellation: Sagittarius
Luminosity: 60 times solar luminosity^[2]

catalog

one brief introduction
two observation data

brief introduction

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Celestial Abyss III, or "Sagittarius alpha", whose English name is Rukbat, is the main star of Sagittarius. It is larger than the sun and belongs to the blue and white main sequence star. Its spectrum is classified as type B, second only to the brightest type O. Since it is far from the sun, its apparent magnitude is 3.96. It is 2.49 times the diameter of the sun and 182 light years away from the earth.^[1] according to Bayer designation It should be the first bright star in Sagittarius, but it is only the 16th bright star.

observation data

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This is a single line Spectral binary System. Roentgen satellite The whole day patrol found that Tianyuansan was launching too many X-ray These X-rays are not expected to come from stars at this spectral level. The most likely explanation is that the companion star is an active Main sequence star Or a star that has just reached the main sequence.^[2]

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