Zeta2 Antliae

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Zeta2 Antliae
Diagram showing star positions and boundaries of the Antlia constellation and its surroundings
Cercle rouge 100%.svg

Location of ζ2 Antliae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Antlia
Right ascension 09h 31m 32.15879s[1]
Declination −31° 52′ 18.5989″[1]
Apparent magnitude (V) 5.91[2]
Spectral type A9 IV[3]
U−B color index +0.16[2]
B−V color index +0.23[2]
Radial velocity (Rv) +19.8 ± 1.6[4] km/s
Proper motion (μ) RA: -49.39[1] mas/yr
Dec.: -0.82[1] mas/yr
Parallax (π) 8.50 ± 0.36[1] mas
Distance 380 ± 20 ly
(118 ± 5 pc)
Absolute magnitude (MV) +0.44[5]
Mass 2.55 M
Radius 4.4 R
Luminosity 61 L
Temperature 7820 K
Other designations
CD-31 7369, HD 82513, HIP 46734, HR 3789, SAO 200459.[6]
Database references

Zeta2 Antliae is the Bayer designation for a star in the southern constellation of Antlia, the air pump. With an apparent visual magnitude of 5.91,[2] it is a relatively faint star that requires dark suburban skies for viewing with the naked eye. Parallax measurements show it to be located at a distance of roughly 380 light-years (120 parsecs) from Earth.[1]

The spectrum of this star matches a stellar classification of A9 IV,[3] where the luminosity class of IV indicate that this is a subgiant star that is evolving away from the main sequence as the supply of hydrogen at its core is becoming exhausted. This is catalogued as an Am star, which means it is a chemically peculiar star that shows strong indications of certain trace metals in its spectrum.[5] It shines with a luminosity approximately 45 times that of the Sun and has a surface temperature of 7273 K.[7]


  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Mendoza, E. E.; Gomez, V. T.; Gonzalez, S. (June 1978), "UBVRI photometry of 225 Am stars", The Astronomical Journal, 83: 606–614, Bibcode:1978AJ.....83..606M, doi:10.1086/112242. 
  3. ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H. 
  4. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065. 
  5. ^ a b Hauck, B.; Curchod, A. (December 1980), "Properties of AM stars in the Geneva photometric system", Astronomy and Astrophysics, 92 (3): 289–295, Bibcode:1980A&A....92..289H. 
  6. ^ "HR 3789 -- Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-06-27. 
  7. ^ 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. Bibcode:2012MNRAS.427..343M. arXiv:1208.2037Freely accessible. doi:10.1111/j.1365-2966.2012.21873.x. 

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