Becrux

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Star
Becrux (β Crucis)
The bright star is Becrux (SDSS image)
The bright star is Becrux ( SDSS image )
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation southern Cross
Right ascension 12 h 47 m 43.3 s
declination -59 ° 41 ′ 20 ″
Apparent brightness 1.25 mag
Typing
B − V color index −0.23 
U − B color index −1.00 
R − I index −0.26 
Spectral class B0.5 III
Variable star type Beta Cephei star 
Astrometry
Radial velocity (+15.6 ± 0.4) km / s
parallax (11.71 ± 0.98)  mas
distance (280 ± 20)  ly
(85 ± 7)  pc  
Visual absolute brightness M vis approx. −3.4 mag
Proper movement 
Rec. Share: (−42.97 ± 0.72)  mas / a
Dec. portion: (−16.18 ± 0.68)  mas / a
Physical Properties
radius 7.9  R ☉
Luminosity

3160  L ☉

Effective temperature 29,000  K
Rotation time 6.3 d
Other names
and catalog entries
Bayer name β crucis
Cordoba Survey CD −59 ° 4451
Bright Star Catalog HR 4853 [1]
Henry Draper Catalog HD 111123 [2]
Hipparcos catalog HIP 62434 [3]
SAO catalog SAO 240259 [4]
Tycho catalog TYC 8659-3107-1 [5]
2MASS catalog 2MASS J12474326-5941194 [6]
Other names Mimosa, FK5 481

Becrux or Mimosa is the proper name of the star β Crucis (Beta Crucis). It is the second brightest star in the Southern Cross constellation . Its distance is about 300 light years .

The IAU has the proper name on July 20, 2016 Mimosa defined as standardized proper name for this star.

Characteristics

Becrux has a spectographic binary star component, but it is too close to be resolved with a telescope . The pair orbits 8 AU away every 5 years . Becrux is a Beta Cephei - variable star of spectral type B0.5 III and probably the strongest of the one like stars.

Because Betacrux with a declination of −60 ° is only conspicuously visible south of the tropic , it has not been given a trivial name . However, "Mimosa" is an often used name because of its color. In Chinese , Becrux is also known as 十字架 三 (the third star in the cross).

Web links

Commons : Becrux  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b c Bright Star Catalog
  3. ↑ Pulkovo radial velocities for 35493 HIP stars
  4. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  5. ↑ estimate
  6. ↑ Becrux on domeofthesky.com ( Memento from September 15, 2016 in the Internet Archive )
  7. ↑ Bulletin of the IAU Working Group on Star Names, No. 1, July 2016. (PDF) Retrieved November 9, 2016 (English, 184 KiB).
  8. ↑ Chandra spectroscopy of the hot star beta Crucis
  9. ↑ Beta Crusis on Hipparcos catalog