Alpha Apodis

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Star
Alpha Apodis
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Bird of paradise
Right ascension 14 h 47 m 51.72 s
declination -79 ° 02 ′ 41.2 ″
Apparent brightness 3.83 likes
Typing
B − V color index 1.43 
U − B color index 1.68 
R − I index 0.53 
Spectral class K3 III
Astrometry
Radial velocity (−0.1 ± 0.7) km / s
parallax (7.5519. ± 0.3237)  mas
distance (432 ± 18)  ly
(132 ± 5)  pc  
Visual absolute brightness M vis −1.78 mag
Proper movement 
Rec. Share: (−7.395 ± 0.716)  mas / a
Dec. portion: (−15.726 ± 0.499)  mas / a
Physical Properties
radius 48  R ☉
Luminosity

928  L ☉

Effective temperature 4312  K
Other names
and catalog entries
Bayer name α Apodis
Bright Star Catalog HR 5470 [1]
Henry Draper Catalog HD 129078 [2]
Hipparcos catalog HIP 72370 [3]
SAO catalog SAO 257193 [4]
Tycho catalog TYC 9436-2393-1 [5]
annotation
  1. ↑ Calculated from apparent brightness and distance.

α Apodis ( Alpha Apodis , α Aps for short ) is the brightest star in the bird of paradise constellation in the southern sky . Nevertheless, it appears to the naked eye with an apparent brightness of 3.83 mag only as a relatively faint object. With a declination of −79 ° it is a circumpolar star for a large part of the southern hemisphere . In the night sky, the star can be found by means of an imaginary line extended to the south celestial pole that runs through Alpha Centauri and Alpha Circini .

According to preliminary parallax measurements by the Gaia probe , the distance from α Apodis is about 432 light years. According to data from the earlier Hipparcos mission, the distance to the star was only slightly different at around 447 light years. α Apodis is a bright orange giant star belonging to the spectral class K, but its subclass is uncertain; in some catalogs it is listed as K2.5, in others as a K5 star. Accordingly, for example, the estimates of its diameter fluctuate between about 48 and 60 solar radii. The star, which has four to five times the mass of the sun, has already left the main sequence and will one day end up as a white dwarf . So far there is no evidence that he has a companion.

Remarks

  1. ↑ a b c d e Gaia data release 2 ( Gaia DR2 ), April 2018
  2. ↑ a b c Alpha Aps in Jim Kaler's star catalog
  3. ↑ a b H. L. Johnson, et al .: UBVRIJKL photometry of the bright stars . In: Communications of the Lunar and Planetary Laboratory . 4, No. 99, 1966. bibcode : 1966CoLPL ... 4 ... 99J .
  4. ↑ HR 5470 , The Bright Star Catalog , 5th revised edition. (preliminary version), D. Hoffleit and WH Warren, Jr., 1991, CDS ID V / 50
  5. ↑ a b “Alf Aps - Star” . SIMBAD Astronomical Object Database , Center de Données astronomiques de Strasbourg
  6. ↑ HD 129078 , database entry , Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition 2001, LE Pasinetti-Fracassini, L. Pastori, S. Covino and A. Pozzi, CDS ID II / 224 .
  7. ↑ a b HIP 72370 , database entry : I. McDonald, et al .: Fundamental Parameters and Infrared Excesses of Hipparcos Stars . In: Monthly Notices of the Royal Astronomical Society . 427, No. 1, 2012, pp. 343-57. arxiv : 1208.2037 . bibcode : 2012MNRAS.427..343M . doi : 10.1111 / j.1365-2966.2012.21873.x .
  8. ↑ Patrick Moore: Exploring the nigth sky with binoculars , 4th edition, 2000, ISBN 0-521-79390-4 , p. 113.
  9. ^ Α Aps , Hipparcos, the New Reduction (van Leeuwen, 2007)
  10. ^ PP Eggleton, AA Tokovinin: A catalog of multiplicity among bright stellar systems . In: Monthly Notices of the Royal Astronomical Society . 389, No. 2, September 2008, pp. 869-879. arxiv : 0806.2878 . bibcode : 2008MNRAS.389..869E . doi : 10.1111 / j.1365-2966.2008.13596.x .