Alrakis

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Double star
Alrakis (μ Draconis)
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
Constellation Dragon
Right ascension 17 h 05 m 20.12 s
declination + 54 ° 28 ′ 12.2 ″
Apparent brightness 4.91 mag
Typing
B − V color index +0.48 
U − B color index +0.05 
R − I index +0.24 
Spectral class F5
Astrometry
parallax (36.45 ± 0.46)  mas
distance (89.5 ± 1.1)  ly
(27.43 ± 0.35)  pc  
Visual absolute brightness M vis +2.72 mag
Proper movement 
Rec. Share: (−58.16 ± 0.56)  mas / a
Dec. portion: (67.87 ± 0.64)  mas / a
Physical Properties
Other names
and catalog entries
Bayer name μ Draconis
Flamsteed name 21 Draconis
Bonn survey BD + 54 ° 1857
Bright Star Catalog HR 6370 [1]
Henry Draper Catalog HD 154906 [2]
Hipparcos catalog HIP 83608 [3]
SAO catalog SAO 30239 [4]
Tycho catalog TYC 3890-1396-2 [5]
Other names FY 9584
annotation
  1. ↑ Calculated from apparent brightness and distance.

Alrakis or Arrakis ( Arabic الراقص, DMG ar-rāqiṣ  'the dancer or the trotting camel') is the proper name of the star μ Draconis ( My Draconis ). Alrakis is a spectroscopic binary star with an apparent magnitude of about 5 mag. Its distance is about 88 light years (Hipparcos database).

Individual evidence

  1. a b c Hipparcos catalog (ESA 1997)
  2. a b c Bright Star Catalog
  3. a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  4. Allen, RH : Star Names: Their Lore and Meaning ( English ), rep. Edition, Dover Publications Inc., New York , NY 1963, ISBN 0-486-21079-0 , p. 211.