Nu Arietis

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Nu Arietis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aries
Right ascension  02h 38m 48.99425s[1]
Declination +21° 57′ 41.0616″[1]
Apparent magnitude (V) 5.43[2]
Spectral type A7 V[3]
U−B color index +0.13[2]
B−V color index +0.16[2]
Radial velocity (Rv)+8.0±4.2[4] km/s
Proper motion (μ) RA: −7.47[1] mas/yr
Dec.: −15.90[1] mas/yr
Parallax (π)9.68 ± 0.76[1] mas
Distance340 ± 30 ly
(103 ± 8 pc)
Absolute magnitude (MV)+0.40[5]
ν Ari A
Mass2.43±0.06[6] M
Radius1.8[7] R
Luminosity63.5[6] L
Surface gravity (log g)3.5±0.25[8] cgs
Temperature8,000±500[8] K
Rotational velocity (v sin i)133[6] km/s
[8] Myr
ν Ari B
Mass1.0±0.03[8] M
Temperature5,551±107[8] K
Metallicity [Fe/H]0.0[8] dex
Rotational velocity (v sin i)10[8] km/s
Other designations
ν Ari, 32 Arietis, BD+21° 362, FK5 89, HD 16432, HIP 12332, HR 773, SAO 75495[9]
Database references

Nu Arietis, Latinized from ν Arietis, is the Bayer designation for a white-hued star in the northern constellation of Aries. It is faintly visible to the naked eye with an apparent visual magnitude of +5.43.[2] Based upon an annual parallax shift of 9.68 mas as seen from Earth,[1] it is located roughly 340 light years from the Sun. It is moving away from the Sun with a radial velocity of 8 km/s.[4]

This is an A-type main sequence star with a stellar classification of A7 V.[3] Nu Arietis has an estimated 2.4[6] times the mass of the Sun and about 1.8[7] times the Sun's radius. The star is radiating 63.5[6] times the Sun's luminosity from its photosphere at an effective temperature of around 8,000 K.[8] It is roughly 621[8] million years old and is spinning with a projected rotational velocity of 133 km/s.[6] A close companion was discovered in 2016 using the direct spectral detection method.[8]


  1. ^ a b c d e f van Leeuwen, F. (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 d Oja, T. (April 1983), "UVB photometry of FK4 and FK4 Supplement stars", Astronomy and Astrophysics Supplement Series, 52: 131–134, Bibcode:1983A&AS...52..131O.
  3. ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. ^ 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.
  6. ^ a b c d e f Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605–619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605.
  7. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 5211–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. ^ a b c d e f g h i j Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 13, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, 40.
  9. ^ "nu. Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.

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