Epsilon Antliae

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ε Antliae
Diagram showing star positions and boundaries of the Antlia constellation and its surroundings
Cercle rouge 100%.svg
Location of ε Antliae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Antlia
Right ascension 09h 29m 14.71968s[1]
Declination –35° 57′ 04.8074″[1]
Apparent magnitude (V) +4.51[2]
Spectral type K3 IIIa[3]
U−B color index +1.68[4]
B−V color index +1.44[4]
Radial velocity (Rv) +22.2[2] km/s
Proper motion (μ) RA: −24.69±0.15[1] mas/yr
Dec.: +5.04±0.18[1] mas/yr
Parallax (π) 4.59 ± 0.24[1] mas
Distance 710 ± 40 ly
(220 ± 10 pc)
Absolute magnitude (MV) −2.17[5]
Radius 37[6] R
Luminosity 1,279[7] L
Temperature 4,320[7] K
Other designations
CD-35 5724, FK5 356, HD 82150, HIP 46515, HR 3765, SAO 200416.[8]
Database references

Epsilon Antliae (ε Ant, ε Antliae) is the Bayer designation for a star in the southern constellation of Antlia. The apparent visual magnitude of this star is +4.51,[2] which means it is visible to the naked eye. From parallax measurements, the distance to this star is known to be around 710 light-years (220 parsecs). Photometry measurements during the Hipparcos mission indicate that this star is undergoing periodic variability by 0.0034 magnitudes over an 11.07941 day cycle.[9]

The stellar classification of this star is K3 IIIa,[3] where the luminosity class of III indicates that this is an evolved giant star. It is around 37 times the radius of the Sun.[6] and shines with a luminosity approximately 1279 times that of the Sun and has a surface temperature of 4320 K.[7]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W. 
  3. ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878Freely accessible. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  4. ^ a b Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J. 
  5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  6. ^ a b Pasinetti-Fracassini, L. E.; et al. (February 2001), "Catalogue of Stellar Diameters (CADARS)", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  7. ^ a b c McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ "eps Ant". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-25. 
  9. ^ Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194Freely accessible, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.