53 Arietis

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53 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 03h 07m 25.67211s[1]
Declination +17° 52′ 47.9669″[1]
Apparent magnitude (V) 6.10[2]
Spectral type B1.5 V[3]
U−B color index [4] 0.80[2]
B−V color index –0.12[2]
Variable type β Cep[4]
Radial velocity (Rv) +21.2[5] km/s
Proper motion (μ) RA: [4] 24.32[1] mas/yr
Dec.: +7.46[1] mas/yr
Parallax (π) 3.92 ± 0.79[1] mas
Distance approx. 800 ly
(approx. 260 pc)
Mass 7.5 ± 0.2[6] M
Rotational velocity (v sin i) 5[7] km/s
Other designations
UW Arietis, BD+17° 493, HD 19374, HIP 14514, HR 938, SAO 93284.[8]
Database references

53 Arietis (abbreviated 53 Ari) is a variable star in the northern constellation of Aries. 53 Arietis is the Flamsteed designation; it also bears the variable star designation UW Arietis. It is a B-type main sequence star with a stellar classification of B1.5 V[3] and mean apparent magnitude of 6.10,[2] which is near the lower limit for naked eye visibility. Based upon an annual parallax shift of 3.92 mas,[1] the estimated distance to this star is roughly 800 light-years (250 parsecs).

53 Arietis is a Beta Cephei variable.[4] It is a runaway star with a peculiar velocity of 48.1 km/s relative to its neighbors.[6] The star was ejected from the Orion nebula some 4–5 million years ago, possibly when an orbiting companion exploded as a supernova.[9]


  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, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Crawford, D. L.; Barnes, J. V.; Golson, J. C. (1971), "Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere", The Astronomical Journal, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220. 
  3. ^ a b Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179. 
  4. ^ a b c d Stankov, Anamarija; Handler, Gerald (June 2005), "Catalog of Galactic β Cephei Stars", The Astrophysical Journal Supplement Series, The Astrophysical Journal Supplement Series, 158 (2): 193–216, Bibcode:2005ApJS..158..193S, arXiv:astro-ph/0506495Freely accessible, doi:10.1086/429408. 
  5. ^ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E. 
  6. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883Freely accessible, doi:10.1111/j.1365-2966.2010.17434.x. 
  7. ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590. 
  8. ^ "UW Ari -- Variable Star of beta Cep type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-08-17. 
  9. ^ Hoogerwerf, R.; de Bruijne, J. H. J.; de Zeeuw, P. T. (January 2001), "On the origin of the O and B-type stars with high velocities. II. Runaway stars and pulsars ejected from the nearby young stellar groups", Astronomy and Astrophysics, 365 (2): 49–77, Bibcode:2001A&A...365...49H, arXiv:astro-ph/0010057Freely accessible, doi:10.1051/0004-6361:20000014. 

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