40 Arietis

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40 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 48m 32.08886s[1]
Declination +18° 17′ 01.6489″[1]
Apparent magnitude (V) 5.82[2]
Spectral type K1 III[3]
U−B color index 1.13
B−V color index +1.20[2]
R−I color index 0.44
Radial velocity (Rv) +47.1[4] km/s
Proper motion (μ) RA: +42.00[1] mas/yr
Dec.: -32.35[1] mas/yr
Parallax (π) 7.06 ± 0.47[1] mas
Distance 460 ± 30 ly
(142 ± 9 pc)
Other designations
BD+17 442, HD 17459, HIP 13108, HR 828, SAO 93118.[5]

40 Arietis is the Flamsteed designation for a binary star[3] system in the northern constellation of Aries. Their combined apparent magnitude is 5.82,[2] putting the system near the limit of naked eye visibility. Based upon an annual parallax shift of just 7.06 mas,[1] it is 460 light-years (140 parsecs) away from the Sun, give or take a 30 light-year margin of error. At that distance, its brightness is diminished by 0.21 in magnitude from extinction caused by interstellar gas and dust.[6]

This is a spectroscopic binary with an angular separation of 0.2 arcseconds between the two components.[3] Their merged spectrum matches that of an evolved giant star with a stellar classification of K1 III.[3]


  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, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode:1978A&AS...34....1N. 
  3. ^ a b c d 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. 
  4. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953QB901.W495...... 
  5. ^ "sig Ari -- Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-18. 
  6. ^ Famaey, B. et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272. 

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