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[47] [48] In 2006, its temperature was calculated to be as high as 3,650 ± 25 K, corresponding to a spectral class of M2.5, [4] yet this star is usually considered as an M4 to M5 star. Adopting the latter classes with the temperature scale proposed by Emily Levesque gives a range of between 3,450 and 3,535 K. [ 54 ]
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The star marked the Great Dog's mouth on Bayer's star atlas. [33] Flanking Sirius are Beta and Gamma Canis Majoris. Also called Mirzam or Murzim, Beta is a blue-white Beta Cephei variable star of magnitude 2.0, which varies by a few hundredths of a magnitude over a period of six hours. [34]
Consequently, β Canis Majoris itself is known as 軍市一 (Jūn Shì yī, English: the First Star of Market for Soldiers). [17] From this Chinese name arose the name Kuen She. [11] The Dunhuang Star Chart noted β Canis Majoris as Yeji "Pheasant Cock", though was located about 10 degrees too far north of its correct position. [18]
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In principle, the temperature of a star can be calculated directly from the B−V index, and there are several formulae to make this connection. [6] A good approximation can be obtained by considering stars as black bodies , using Ballesteros' formula [ 7 ] (also implemented in the PyAstronomy package for Python): [ 8 ]
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Star name Temperature ()Spectral type Distance (light years) Notes WISE 0855–0714: 285 Y4 7.426 ± 0.039 [9]WISE 0336-0143B [10]: 295 ± 10 [11]: Y1? 32.7 [12]: spectral type is not yet published, but should be around Y1 if we assume MIRI F480M is similar to W2 and by using Figure 13 from Kirkpatrick et al. 2012 [13] Might be a later spectral type.