Beta Piscium

Beta Piscium
Location of β Piscium (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pisces
Right ascension 23h 03m 52.61349s[1]
Declination +03° 49′ 12.1662″[1]
Apparent magnitude (V) +4.40[2]
Characteristics
Spectral type B6Ve[3]
U−B color index −0.48[4]
B−V color index −0.12[4]
Variable type Suspected[5]
Astrometry
Radial velocity (Rv)0.0 ± 0.6[6] km/s
Proper motion (μ) RA: 11.76[1] mas/yr
Dec.: −9.85[1] mas/yr
Parallax (π)7.99 ± 0.22 mas[1]
Distance410 ± 10 ly
(125 ± 3 pc)
Absolute magnitude (MV)−1.01[7]
Details[3]
Mass4.7 M☉
Radius3.6 R☉
Luminosity523.6[8] L☉
Surface gravity (log g)4.0 cgs
Temperature15500 K
Rotational velocity (v sin i)90 ± 15 km/s
Other designations
Fumalsamakah, Beta Psc, β Psc, 4 Psc, BD+03° 4818, FK5 1602, HD 217891, HIP 113889, HR 8773, SAO 127934[9]
Database references
SIMBADdata

Beta Piscium or β Piscium, formally named Fumalsamakah /ˌfʌməlˈsæməkə/,[10] is a blue-white hued star in the zodiac constellation of Pisces. Its apparent magnitude is 4.40,[2] meaning it can be faintly seen with the naked eye. Based on parallax measurements taken during the Hipparcos mission, it is about 410 light-years (125 parsecs) distant from the Sun.[1]

  1. ^ a b c d e f van Leeuwen, F.; et al. (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.
  2. ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ a b Jones, C. E.; Tycner, C.; Sigut, T. A. A.; Benson, J. A.; Hutter, D. J. (2008). "A Parameter Study of Classical Be Star Disk Models Constrained by Optical Interferometry". The Astrophysical Journal. 687 (1): 598–607. arXiv:0807.1515. Bibcode:2008ApJ...687..598J. doi:10.1086/591726. S2CID 21247164.
  4. ^ a b Crawford, D. L.; Barnes, J. V.; Golson, J. C. (1971). "Four-color, Hbeta, 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.
  5. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  6. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  7. ^ 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.
  8. ^ Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  9. ^ "* bet Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 April 2017.
  10. ^ "Naming Stars". IAU.org. Retrieved 18 June 2018.