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 51.97256s [1]
Declination +11° 02′ 36.1621″ [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: –69.464 [1]   mas/yr
Dec.: –27.522 [1]   mas/yr
Parallax (π)23.7942 ± 0.1026  mas [1]
Distance 137.1 ± 0.6  ly
(42.0 ± 0.2  pc)
Absolute magnitude  (MV)2.80 [5]
Details
Mass 1.48 [6]   M☉
Radius 1.62+0.08
−0.05 [1]   R☉
Luminosity 6.01±0.03 [1]   L☉
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 [7]  km/s
Age 582 [6]   Myr
Other designations
54 Cet, NSV  635, BD+10°252, HD  11257, HIP  8588, HR  534, SAO  92659 [8]
Database references
SIMBAD data

54 Ceti is an older Flamsteed designation [9] for a star that is now located within the constellation boundaries of Aries, [10] the Ram. In the present day it is known by star catalogue identifiers like HD 11257 or HR 534. [8] At an apparent visual magnitude of 5.94, [2] it can be seen 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. [11] It is located near the ecliptic and hence is subject to occasional occultation by the Moon. [12]

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. The star is around 582 [6]  million years old with a projected rotational velocity of 29 km/s. [7] It has 1.5 [6] times the mass of the Sun and 1.6 [1] times the Sun's radius. The star is radiating six [1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,099 K. [3] It is a candidate member of the Ursa Major Moving Group, which has an estimated age of 500 ± 100 million years. [13]

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<span class="mw-page-title-main">42 Persei</span> Binary star system in the constellation Perseus

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Sigma1 Gruis, a Latinization of σ1 Gruis, is a star in the constellation Grus. It is a dim, white-hued star near the lower limit for visibility to the naked eye with an apparent visual magnitude of 6.26. This object is located 229 light-years (70.1 pc) distant from the Sun based on parallax. The radial velocity of this star is poorly constrained, but it appears to be drifting further away at the rate of +7 km/s.

References

  1. 1 2 3 4 5 6 7 8 9 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
  3. 1 2 3 4 5 6 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 , S2CID   119428437.
  4. ↑ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  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, S2CID   119257644.
  6. 1 2 3 4 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv: 1501.03154 , Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID   33401607.
  7. 1 2 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, S2CID   18475298.
  8. 1 2 "54 Cet". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-08-18.
  9. ↑ 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.
  10. ↑ Hoffleit, D. (July 1979), "Discordances in star designations", Bulletin d'Information du Centre de Données Stellaires, 17 (17): 38, Bibcode:1979BICDS..17...38H.
  11. ↑ 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, S2CID   18759600.
  12. ↑ Richichi, A.; et al. (January 2006), "The Calar Alto lunar occultation program: update and new results", Astronomy and Astrophysics, 445 (3): 1081–1088, arXiv: astro-ph/0509088 , Bibcode:2006A&A...445.1081R, doi:10.1051/0004-6361:20053901, S2CID   14739715.
  13. ↑ 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 .
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