Eta Antliae

Eta Antliae
Diagram showing star positions and boundaries of the Antlia constellation and its surroundings


Location of η Antliae (circled)

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Antlia
Right ascension 09h 58m 52.27556s[1]
Declination –35° 53′ 27.5098″[1]
Apparent magnitude (V) 5.222[2]
Characteristics
Spectral type F1 V[3]
U−B color index +0.068[2]
B−V color index +0.333[2]
Astrometry
Radial velocity (Rv)+30[4] km/s
Proper motion (μ) RA: –89.65[1] mas/yr
Dec.: –17.23[1] mas/yr
Parallax (π)30.02 ± 0.24[1] mas
Distance108.6 ± 0.9 ly
(33.3 ± 0.3 pc)
Details
η Ant A
Mass1.55[5] M☉
Luminosity6.6[5] L☉
Surface gravity (log g)3.94[3] cgs
Temperature7,132[3] K
Metallicity [Fe/H]–0.20[3] dex
Age0.9[5] Gyr
Other designations
CD–35 6050, FK5 377, HD 86629, HIP 48926, HR 3947, SAO 200926.[6]
Database references
SIMBADdata
Database references
SIMBADdata

Eta Antliae (η Ant, η Antliae) is the Bayer designation for a double star in the southern constellation of Antlia. The brighter component has an apparent visual magnitude of 5.222,[2] making it visible to the naked eye. Parallax measurements of the system yield a distance estimate of 108.6 light-years (33.3 parsecs) from Earth.[1]

The main component has a stellar classification of F1 V,[3] which indicates that it is an F-type main sequence star. This star has 55% more mass than the Sun.[5] It shines with 6.6[5] times the Sun's luminosity at an effective temperature of 7,132 K.[3] This heat gives it the yellow-white glow of an F-type star.[7] It has a faint companion located 31 arcseconds away with an apparent magnitude of +11.3. Most likely this pair form a binary star system.[8]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. ↑ 2.0 2.1 2.2 2.3 Gutierrez-Moreno, Adelina et al. (1966), A System of photometric standards 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode:1966PDAUC...1....1G.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Gray, R. O. et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  4. ↑ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953QB901.W495......
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Mallik, Sushma V.; Parthasarathy, M.; Pati, A. K. (October 2003), "Lithium and rotation in F and G dwarfs and subgiants", Astronomy and Astrophysics 409: 251–261, Bibcode:2003A&A...409..251M, doi:10.1051/0004-6361:20031084.
  6. ↑ "eta Ant -- Star in double system", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-06-28.
  7. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16.
  8. ↑ 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.