29 Arietis

29 Arietis is a triple star[5] system in the northern constellation of Aries. 29 Arietis is the Flamsteed designation. Its annual parallax shift of 34.86±0.13 mas[1] indicates a distance of about 94 light-years (29 parsecs) from Earth. The system is barely visible to the naked eye with an apparent visual magnitude of 6.0; it is 0.02 degree north of the ecliptic.[2] It is moving further from Earth with a heliocentric radial velocity of 9 km/s.[2]

29 Arietis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aries
Right ascension 02h 32m 54.14202s[1]
Declination +15° 02 04.3103[1]
Apparent magnitude (V) 6.00[2]
Spectral type F7 V + G5 V[3] + ?
B−V color index 0.572±0.006[2]
Radial velocity (Rv)9.1±2.5[2] km/s
Proper motion (μ) RA: −20.557[1] mas/yr
Dec.: +50.206[1] mas/yr
Parallax (π)34.8568 ± 0.1313[1] mas
Distance93.6 ± 0.4 ly
(28.7 ± 0.1 pc)
Absolute magnitude (MV)4.2/5.0[4]
Period (P)19.4161±0.0005 d
Eccentricity (e)0.4096±0.0033
Longitude of the node (Ω)179.09±0.44°
Periastron epoch (T)2,454,101.914±0.018 JD
Semi-amplitude (K1)
23.36±0.09 km/s
29 Ari A
Mass1.14[5] M
Luminosity3.27[2] L
Surface gravity (log g)4.12[6] cgs
Temperature6,063±114[4] K
Metallicity [Fe/H]0.09[6] dex
Age3.0±1.8[4] Gyr
29 Ari B
Mass0.88[5] M
Temperature5,270±170[4] K
Other designations
29 Ari, BD+14°419, FK5 2176, GJ 3161, HD 15814, HIP 11843, HR 741, SAO 92998, WDS J02329+1502[7]
Database references

The core of the system is formed by a close spectroscopic binary with an angular separation of 3.892 mas,[5] a semimajor axis of 0.15692±0.00086 AU, an orbital period of 19.4 days, and an eccentricity of 0.4.[4] 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.[5]


  1. 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.
  2. 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.
  3. Lu, W. (April 1986), "The spectroscopic orbit of the double-lined binary 29 ARIETIS", Astronomical Society of the Pacific, Publications, 98: 468–470, Bibcode:1986PASP...98..468L, doi:10.1086/131780.
  4. Katoh, Noriyuki; et al. (February 2013), "Determination of Orbital Elements of Spectroscopic Binaries Using High-dispersion Spectroscopy", The Astronomical Journal, 145 (2): 12, Bibcode:2013AJ....145...41K, doi:10.1088/0004-6256/145/2/41, 41.
  5. 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.
  6. Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  7. "29 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-02.
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