20 Arietis

20 Arietis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aries
Right ascension 02h 15m 46.04981s[1]
Declination +25° 46′ 58.5741″[1]
Apparent magnitude (V) 5.79[2]
Distance137 ± 2 ly
(42.1 ± 0.6[1] pc)
Spectral typeF6 IV-V[3]
Other designations
BD+25 373, HD 13871, HIP 10540, HR 656, SAO 75239.[4]

20 Arietis (abbreviated 20 Ari) is a star in the northern constellation of Aries. 20 Arietis is the Flamsteed designation. A member of the Hyades open cluster (Melotte 25) it has an apparent visual magnitude of 5.79,[2] which is bright enough to be just faintly visible to the named eye. Based upon an annual parallax shift of 23.75 ± 0.33 mas, it is approximately 137 light-years (42 parsecs) distant from Earth.

This star has a stellar classification of F6 IV-V,[3] with the spectrum indicating it shows properties of both a main sequence and a more evolved subgiant star. 20 Arietis is around 1.7 billion years old.[5]

References

  1. 1 2 3 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 Freely accessible, doi:10.1051/0004-6361:20078357.
  2. 1 2 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.
  3. 1 2 Harlan, E. A. (September 1969), "MK classifications for F- and G-type stars. I", Astronomical Journal, 74: 916–919, Bibcode:1969AJ.....74..916H, doi:10.1086/110881.
  4. ↑ "20 Ari -- Star in Cluster", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-18.
  5. ↑ Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, Bibcode:2009A&A...501..941H, arXiv:0811.3982 Freely accessible, doi:10.1051/0004-6361/200811191.


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