4 Arietis

From Wikipedia, the free encyclopedia
Jump to: navigation, search
4 Arietis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aries
Right ascension 01h 48m 10.93603s[1]
Declination +16° 57′ 19.9768″[1]
Apparent magnitude (V) 5.86[2]
Distance 275 ± 6 ly
(84 ± 2[1] pc)
Spectral type B9.5 V[3]
Other designations
BD+16° 203, FK5 1050, HD 10982, HIP 8387, HR 522, SAO 92637.[4]

4 Arietis (abbreviated 4 Ari) is a star in the northern constellation of Aries, the ram. 4 Arietis is the Flamsteed designation. Its apparent magnitude is 5.86. It has an annual parallax shift of 11.85 ± 0.25 mas,[1] which corresponds to a distance from Earth of 275 light-years (84 parsecs). It has an apparent visual magnitude of 5.86,[2] making it visible to the naked eye from dark suburban skies. This is a B-type main sequence star with a stellar classification of B9.5 V.[3] It has around 2.5 times the mass of the Sun and shines with 40 times the Sun's luminosity.[5]


  1. ^ a b c d van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b Oja, T. (April 1983), "UBV 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. ^ "4 Ari -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 1 August 2012. 
  5. ^ Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052Freely accessible, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691. 

External links[edit]