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{{Starbox begin
{{Starbox begin
| name=Beta Piscium
|name=Beta Piscium}}
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}}
{{Starbox image
{{Starbox image
| image =
| image =
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| caption=Location of β Piscium (circled)
| caption=Location of β Piscium (circled)
}}
}}
{{Starbox short |
{{Starbox observe
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|constell=[[Pisces (constellation)|Pisces]]
| name=
| epoch=[[J2000.0]]
|epoch=[[J2000]]
|ra={{RA|23|03|52.61349}}<ref name=HIP>{{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author1=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357}}</ref>
⚫
| constell=[[Pisces (constellation)|Pisces]]
|dec={{DEC|+03|49|12.1662}}<ref name=HIP/>
| ra=23<sup>h</sup> 03<sup>m</sup> 52.6<sup>s</sup>
|appmag_v=+4.40<ref name=Ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati, J. R.|year=2002}}</ref>
| dec=+03° 49' 12"
| spectral=B6Ve
| appmag_v=+4.53
| dist_ly=492
| dist_pc=151
| names=Fum al Samakah, β&nbsp;Piscium, β&nbsp;Psc, Beta&nbsp;Psc, 4&nbsp;Psc, [[Star catalogue#BD/CD/CPD|BD]]+03&nbsp;4818, [[Fifth Fundamental Catalogue|FK5]]&nbsp;1602, [[Boss General Catalogue|GC]]&nbsp;32134, [[Henry Draper Catalogue|HD]]&nbsp;217891, [[Hipparcos catalogue|HIP]]&nbsp;113889, [[Bright Star Catalogue|HR]]&nbsp;8773, [[PPM Star Catalogue|PPM]]&nbsp;173700, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;127934
}}
}}
{{Starbox character
|class=B6Ve<ref name=Jones/>
|b-v=&minus;0.12<ref name=UBV>{{cite journal|bibcode=1971AJ.....76.1058C|doi=10.1086/111220|title=Four-color, Hbeta, and UBV photometry for bright B-type stars in the northern hemisphere|journal=The Astronomical Journal|volume=76|pages=1058|year=1971|last1=Crawford|first1=D. L.|last2=Barnes|first2=J. V.|last3=Golson|first3=J. C.}}</ref>
|u-b=&minus;0.48<ref name=UBV/>
|variable=''Suspected''<ref name=GCVS>{{cite journal|bibcode=2009yCat....1.2025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S|volume=1|display-authors=etal|author1=Samus, N. N.|author2=Durlevich, O. V.|year=2009}}</ref>
⚫
}}
{{Starbox astrometry
|radial_v=0.0 ± 0.6<ref name=RV>{{cite journal|url=http://adsabs.harvard.edu/abs/2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053}}</ref>
|prop_mo_ra=11.76<ref name=HIP/>
|prop_mo_dec=&minus;9.85<ref name=HIP/>
|parallax=7.99
|p_error=0.22
|parallax_footnote=<ref name=HIP/>
}}
{{Starbox detail
|source=<ref name=Jones>{{cite journal|bibcode=2008ApJ...687..598J|doi=10.1086/591726|arxiv=0807.1515|title=A Parameter Study of Classical Be Star Disk Models Constrained by Optical Interferometry|journal=The Astrophysical Journal|volume=687|pages=598–607|year=2008|last1=Jones|first1=C. E.|last2=Tycner|first2=C.|last3=Sigut|first3=T. A. A.|last4=Benson|first4=J. A.|last5=Hutter|first5=D. J.}}</ref>
|mass=4.7
|radius=3.6
|gravity=4.0
|temperature=15500
|rotational_velocity=90 ± 15
}}
{{Starbox catalog
|names={{odlist|name1=Fum al Samakah|B=&beta; Psc|F=4 Psc|BD=+03° 4818|FK5=1602|HD=217891|HIP=113889|HR=8773|SAO=127934}}<ref name=SIMBAD>{{cite simbad|title=* bet Psc|accessdate=30 April 2017}}</ref>
}}
{{Starbox reference
|Simbad=bet+Psc
}}
{{Starbox end}}
'''Beta Piscium''' ('''β&nbsp;Piscium'''), also known by its traditional name '''Fum al Samakah''', is a [[star]] in the zodiac [[constellation]] of [[Pisces (constellation)|Pisces]]. Its [[apparent magnitude]] is 4.40,<ref name=Ducati/> meaning it can be faintly seen with the naked eye. Based on [[stellar parallax|parallax]] estimates made by the [[Hipparcos]] spacecraft, the system is located about 410 [[light-year]]s (125 [[parsec]]s) away.<ref name=HIP/>


Beta Piscium is a [[Be star]],<ref name=SIMBAD/> a special class of [[B-type star]]s with emission lines in their [[spectrum|spectra]]. With a [[spectral type]] of B6Ve<ref name=Jones/> its mass is estimated to be about {{solar mass|4.7}}, and its radius is about {{solar mass|3.6}}.<ref name=Jones/> It is suspected to be a [[variable star]].<ref name=GCVS/>
'''Beta Piscium''' ('''Beta&nbsp;Psc''', '''β&nbsp;Piscium''', '''β&nbsp;Psc''') is a [[star]] in the [[constellation]] [[Pisces (constellation)|Pisces]]. It has the traditional name '''Fum al Samakah'''.

Beta Piscium belongs to the [[spectral class]] B6Ve and is of [[apparent magnitude|magnitude]] +4.53m. It is approximately 492 [[light-years]] from the Sun.


==Name and etymology==
==Name and etymology==

Revision as of 21:46, 6 May 2017

Beta Piscium
Diagram showing star positions and boundaries of the Pisces constellation and its surroundings
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)
Details[3]
Mass4.7 M☉
Radius3.6 R☉
Surface gravity (log g)4.0 cgs
Temperature15500 K
Rotational velocity (v sin i)90 ± 15 km/s
Other designations
β Psc, 4 Psc, BD+03° 4818, FK5 1602, HD 217891, HIP 113889, HR 8773, SAO 127934[7]
Database references
SIMBADdata

Beta Piscium (β Piscium), also known by its traditional name Fum al Samakah, is a 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 estimates made by the Hipparcos spacecraft, the system is located about 410 light-years (125 parsecs) away.[1]

Beta Piscium is a Be star,[7] a special class of B-type stars with emission lines in their spectra. With a spectral type of B6Ve[3] its mass is estimated to be about 4.7 M☉, and its radius is about 3.6 M☉.[3] It is suspected to be a variable star.[5]

Name and etymology

  • The name Fum al Samakah was from the Arabic فم السمكة fum al-samakah "mouth of the fish" (compare Fomalhaut).[8][9]
  • In Chinese, 霹靂 (Pī Lì), meaning Thunderbolt, refers to an asterism consisting of refers to an asterism consisting of β Piscium, γ Piscium, θ Piscium, ι Piscium and ω Piscium. Consequently, β Piscium itself is known as 霹靂一 (Pī Lì yī, English: the First Star of Thunderbolt.)[10]

References

  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.
  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 c d 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: 598–607. arXiv:0807.1515. Bibcode:2008ApJ...687..598J. doi:10.1086/591726.
  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. ^ a b 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....1.2025S.
  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.
  7. ^ a b "* bet Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 April 2017.
  8. ^ HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, Kostjuk 2002, refer to table3.dat
  9. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Pisces, the Fishes
  10. ^ Template:Zh icon AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 8 日


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