29 Arietis

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29 Arietis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aries
Right ascension 02h 32m 54.1405s[1]
Declination +15° 02′ 04.395″[1]
Apparent magnitude (V) 6.001[2]
Distance98 ± 1 ly
(29.9 ± 0.3[1] pc)
Spectral typeF8 V[3]
Other designations
BD+14 419, FK5 2176, GJ 3161, HD 15814, HIP 11843, HR 741, SAO 92998.[2]

29 Arietis (abbreviated 29 Ari) is a triple star[4] system in the northern constellation of Aries. 29 Arietis is the Flamsteed designation. It has an annual parallax shift of 33.40 ± 0.36 mas,[1] which corresponds to a physical distance of approximately 98 light-years (30 parsecs) from Earth. The star is just barely visible to the naked eye with an apparent visual magnitude of 6.0.[2]

The core of the system is formed by a close spectroscopic binary with an angular separation of 3.892 mas and an orbital period of 19.379 days. The larger member of this pair has 114% of the mass of the Sun, while its companion has 88% of the Sun's mass. Orbiting the pair at an angular separation of 1.422 arcseconds over a period of 164 years, the tertiary component has 52% of the Sun's mass.[4]


  1. ^ a b c d 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. ^ a b c "29 Ari -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-08-14.
  3. ^ 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. ^ a b Tokovinin, A.; et al. (May 2006), "Tertiary companions to close spectroscopic binaries", Astronomy and Astrophysics, 450 (2): 681–693, arXiv:astro-ph/0601518, Bibcode:2006A&A...450..681T, doi:10.1051/0004-6361:20054427.

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