Ankaa

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Star
Ankaa (α Phoenicis)
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Phoenix
Right ascension 00 h 26 m 17.05 s
declination -42 ° 18 ′ 21.5 ″
Apparent brightness 2.4 mag
Typing
B − V color index +1.09 
U − B color index +0.88 
R − I index +0.60 
Spectral class K0 III ...
Astrometry
Radial velocity (75.2 ± 3.9) km / s
parallax (38.50 ± 0.73)  mas
distance (84.7 ± 1.6)  ly
(25.97 ± 0.49)  pc  
Visual absolute brightness M vis +0.33 mag
Proper movement 
Rec. Share: (233.05 ± 0.65)  mas / a
Dec. portion: (−356.30 ± 0.74)  mas / a
Physical Properties
Dimensions (2.5)  M ☉
radius (13)  R ☉
Luminosity

(86)  L ☉

Effective temperature (4800)  K
Other names
and catalog entries
Bayer name α Phoenicis
Cordoba Survey CD -42 ° 116
Bright Star Catalog HR 99 [1]
Henry Draper Catalog HD 2261 [2]
Gliese catalog GJ 9013 [3]
Hipparcos catalog HIP 2081 [4]
SAO catalog SAO 215093 [5]
Tycho catalog TYC 7527-1031-1 [6]
2MASS catalog 2MASS J00261699-4218216 [7]
Other names Ankaa • FK5  12
annotation
  1. ↑ Calculated from apparent brightness and distance.

Ankaa (from Arabic عنقاء, DMG ʿanqāʾ '  phoenix') is the proper name of the star α Phoenicis (Alpha  Phoenicis , α Phe for short ). Instead of a phoenix, medieval Arab astronomers saw a small boat in the star constellation and therefore gave Ankaa the proper name -Nair az-Zauraq  /النائر الزورق / an-nāʾir az-zawraq  / 'the shining end of the boat'.

Ankaa is the brightest star in Phoenix with an apparent magnitude of +2.4 mag and belongs to the spectral class K0 III. The star's distance from Earth is 85 light years . It is a spectroscopic binary star with an orbital period of 3849 days. In a relatively "short" time in astronomical terms, it will repel its outer shell as a planetary nebula and become a white dwarf .

See also

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. ↑ a b c d Ankaa. Jim Kaler, accessed October 13, 2018 .