Murzim

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Star
Murzim (β CMa)
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
Constellation Big dog
Right ascension 06 h 22 m 41.98 s
declination -17 ° 57 ′ 21.3 ″
Apparent brightness 1.97 (1.97 to 2.00) mag
Typing
B − V color index −0.23 
U − B color index −0.98 
R − I index −0.24 
Spectral class B1 II-III
Variable star type BCEP 
Astrometry
Radial velocity (33.7 ± 0.5) km / s
parallax (6.62 ± 0.22)  mas
distance (493 ± 16)  ly
(151.1 ± 5.0)  pc  
Visual absolute brightness M vis −3.92 mag
Proper movement 
Rec. Share: (−3.23 ± 0.19)  mas / a
Dec. portion: (−0.78 ± 0.20)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name β Canis maioris
Flamsteed name 2 Canis Maioris
Bonn survey BD -17 ° 1467
Bright Star Catalog HR 2294 [1]
Henry Draper Catalog HD 44743 [2]
Hipparcos catalog HIP 30324 [3]
SAO catalog SAO 151428 [4]
Tycho catalog TYC 5938-2918-1 [5]
2MASS catalog 2MASS J06224199-1757215 [6]
Other names Mirzam, FK5 243
annotation
  1. ↑ Calculated from apparent brightness and distance.

Murzim , also Mirza or Mirzam , is the name of the star Beta Canis Maioris . The traditional Arabic name isمرزم'Herald, Harbinger', and presumably refers to his position since he is the Harbinger of Sirius , i.e. H. rises before him and announces him, the brightest star in the night sky.

Murzim is a blue supergiant (spectral type B1II-III), the brightness of which fluctuates between +1.95 mag and +2.00 mag with a period of 6 hours (type Beta Cephei). It is about 500 light years away from Earth (Hipparcos database).

In ancient Egypt , Murzim belonged as a minor star to the ancient Egyptian constellation Sopdet .

The IAU Working Group on Star Names (WGSN) has the proper name on July 20, 2016 Mirzam defined as standardized proper name for this star.

See also

Web links

Individual evidence

  1. a b bet CMa. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on September 21, 2018 .
  2. a b c bet CMa. In: VSX. AAVSO, accessed September 21, 2018 .
  3. a b c Bright Star Catalog
  4. Pulkovo radial velocities for 35493 HIP stars
  5. a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  6. Bulletin of the IAU Working Group on Star Names, No. 1, July 2016. (PDF) Retrieved November 9, 2016 (English, 184 KiB).