Epsilon Antliae

from Wikipedia, the free encyclopedia
Star
Epsilon Antliae
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Air pump
Right ascension 9 h 29 m 14.72 s
declination -35 ° 57 ′ 4.8 ″
Apparent brightness 4.51 likes
Typing
B − V color index 1.44 
U − B color index 1.68 
R − I index 0.76 
Spectral class K3 IIIa
Astrometry
Radial velocity (+22.2 ± 0.9) km / s
parallax (5.5233 ± 0.2778)  mas
distance (590 ± 28)  ly
(181 ± 9)  pc  
Visual absolute brightness M vis −1.78 mag
Proper movement 
Rec. Share: (−24,774 ± 0.306)  mas / a
Dec. portion: (+5,702 ± 0.357)  mas / a
Physical Properties
radius 37  R ☉
Luminosity

1279  L ☉

Effective temperature 4320  K
Other names
and catalog entries
Bayer name ε Antliae
Bright Star Catalog HR 3765 [1]
Henry Draper Catalog HD 82150 [2]
Hipparcos catalog HIP 46515 [3]
SAO catalog SAO 200416 [4]
annotation
  1. ↑ Calculated from apparent brightness and distance.

ε Antliae ( Epsilon Antliae , short ε Ant ) is the second brightest star in the constellation Air Pump . Nevertheless, with its apparent brightness of 4.51 mag , it appears only as a weakly visible object to the naked eye. The distance of this orange giant star of the spectral class K3 and a radius of about 37 solar radii is about 590 light years . With an absolute magnitude likes of -1.78 he would in a standard distance of 32.6 light years (= 10 parsecs ) is significantly brighter than the sun shine when it would also be 10 parsecs from Earth; accordingly, it clearly exceeds the luminosity of the sun, namely around 1300 times. Photometric measurements during the Hipparcos mission indicate that ε Antliae shows slight fluctuations in brightness of 0.0034 mag with a period of 11.07941 days.

Individual evidence

  1. ↑ a b c d e Gaia data release 2 ( Gaia DR2 ), April 2018
  2. ↑ a b Hipparcos catalog (ESA 1997)
  3. ↑ a b c D. Hoffleit, WH Warren, Jr .: HR 3765 . In: The Bright Star Catalog (5th revised edition) . Center de Données astronomiques de Strasbourg .
  4. ↑ a b P. P. 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 .
  5. ^ "SIMBAD query result - eps Ant" . Center de données astronomiques de Strasbourg , SIMBAD
  6. ↑ a b HD 82150 , database entry , Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, LE Pasinetti-Fracassini, L. Pastori, S. Covino and A. Pozzi, CDS ID II / 224 .
  7. ↑ a b c I. McDonald, AA Zijlstra, ML Boyer: Fundamental Parameters and Infrared Excesses of Hipparcos Stars . In: Monthly Notices of the Royal Astronomical Society . 427, No. 1, 2012, pp. 343-357. arxiv : 1208.2037 . bibcode : 2012MNRAS.427..343M . doi : 10.1111 / j.1365-2966.2012.21873.x .
  8. ↑ Chris Koen, Laurent Eyer: New periodic variables from the Hipparcos epoch photometry . In: Monthly Notices of the Royal Astronomical Society . 331, No. 1, March 2002, pp. 45-59. arxiv : astro-ph / 0112194 . bibcode : 2002MNRAS.331 ... 45K . doi : 10.1046 / j.1365-8711.2002.05150.x .