54 Ceti

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54 Ceti
Local 54 cet.png
Location of 54 Ceti (HD 11257) near the constellation boundary of Aries (pink). Nearby are the constellations of Pisces (blue) and Cetus (green).
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 01h 50m 51.97276s[1]
Declination +11° 02′ 36.1563″[1]
Apparent magnitude (V) 5.94[2]
Characteristics
Spectral type F2 Vw[3]
U−B color index –0.03[2]
B−V color index +0.30[2]
R−I color index 0.17
Astrometry
Radial velocity (Rv) +11.1[4] km/s
Proper motion (μ) RA: –69.39[1] mas/yr
Dec.: –28.45[1] mas/yr
Parallax (π) 23.80 ± 0.44[1] mas
Distance 137 ± 3 ly
(42.0 ± 0.8 pc)
Details
Radius 1.2–1.8[5] R
Surface gravity (log g) 4.50[3] cgs
Temperature 7,099[3] K
Metallicity [Fe/H] –0.20[3] dex
Rotational velocity (v sin i) 29[6] km/s
Other designations
BD+10° 252, HD 11257, NSV 635, HIP 8588, HR 534, SAO 92659.[7]

54 Ceti is an older Flamsteed designation[8] for a star that is now located within the constellation boundaries of Aries,[9] the Ram. In the present day it is known by star catalogue identifiers like HD 11257 or HR 534.[7] At an apparent visual magnitude of 5.94,[2] it is a challenge to view with the naked eye. The distance to this star, as determined using parallax measurements made during the Hipparcos mission, is approximately 139 light-years (43 parsecs), give or take a 6 light-year margin of error.[1] It is located near the ecliptic and hence is subject to occasional occultations by the Moon and planets.[7]

This is an F-type main sequence star with a stellar classification of F2 Vw,[3] where the 'w' indicates weak absorption lines in the spectrum. It is a candidate member of the Ursa Major Moving Group, which has an estimated age of 500 ± 100 million years.[10]

References[edit]

  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 d Johnson, H. L. et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode:1966CoLPL...4...99J. 
  3. ^ a b c d e Cenarro, A. J. et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society 374 (2): 664–690, arXiv:astro-ph/0611618, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x. 
  4. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953QB901.W495...... 
  5. ^ Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  6. ^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224. 
  7. ^ a b c "HR 534 -- Variable Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-08-18. 
  8. ^ Hoffleit, Dorrit (1964), Catalogue of bright stars (3rd revised ed.), New Haven, Conn.: Yale University Observatory, Bibcode:1964cbs..book.....H.  See the Online Data entry for HR 534.
  9. ^ Hoffleit, D. (July 1979), "Discordances in star designations", Bulletin d'Information du Centre de Donnees Stellaires (17): 38, Bibcode:1979BICDS..17...38H. 
  10. ^ Monier, R. (November 2005), "Abundances of a sample of A and F-type dwarf members of the Ursa Major Group", Astronomy and Astrophysics 442 (2): 563–566, Bibcode:2005A&A...442..563M, doi:10.1051/0004-6361:20053222. 

External links[edit]