Epsilon Antliae

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 590 ± 30 light-years (180.9 ± 9.2 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.[10]

ε Antliae
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]
Characteristics
Spectral type K3 IIIa[3]
U−B color index +1.68[4]
B−V color index +1.44[4]
Astrometry
Radial velocity (Rv)+22.2[2] km/s
Proper motion (μ) RA: −24.774±0.306[5] mas/yr
Dec.: +5.702±0.357[5] mas/yr
Parallax (π)5.5233 ± 0.2778[5] mas
Distance590 ± 30 ly
(181 ± 9 pc)
Absolute magnitude (MV)−2.17[6]
Details
Radius37[7] R☉
Luminosity1,279[8] L☉
Temperature4,320[8] K
Other designations
CD-35 5724, FK5 356, HD 82150, HIP 46515, HR 3765, SAO 200416.[9]
Database references
SIMBADdata

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.[7] and shines with a luminosity approximately 1279 times that of the Sun and has a surface temperature of 4320 K.[8]

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W.
  3. 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:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  4. 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. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  6. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  7. Pasinetti-Fracassini, L. E.; et al. (February 2001), "Catalogue of Stellar Diameters (CADARS)", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. 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:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  9. "eps Ant". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-25.
  10. 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/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.
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