| 词条 | Beta Cancri |
| 释义 |
| name = β Cancri }}{{Starbox image | image = | caption = β Cancri is the bottom right star in the "crab" }}{{Starbox observe | epoch = J2000 | ra = {{RA|08|16|30.9206}}[1] | dec = {{DEC|+09|11|07.961}}[1] | appmag_v = 3.50 - 3.58[3] | constell = Cancer }}{{Starbox character | class = K4III Ba1[4] | b-v = +1.48[5] | u-b = +1.77[5] }}{{Starbox astrometry | radial_v = 22.94[7] | prop_mo_ra = −46.80[1] | prop_mo_dec = −48.65[1] | parallax = 11.23 | p_error = 0.97 | parallax_footnote =[1] | absmag_v = −1.218[11] }}{{Starbox detail | mass = | radius = 61[12] | luminosity = 871[12] | temperature = 3,990[12] | gravity = 1.5[12] | metal = −0.24[12] | rotational_velocity = 6.9[12] }}{{Starbox catalog | names = Tarf, β Cancri, 17 Cancri, HR 3249, HD 69267, BD+09°1917, FK5 312, HIP 40526, SAO 116569, GC 11254, ADS 6704, CCDM 08165+0911, WDS J08165+0911A.[1] }}{{Starbox reference | Simbad = HR+3249 }}{{Starbox end}}Beta Cancri (β Cancri, abbreviated Beta Cnc, β Cnc), also named Tarf,[2] is the brightest star in the zodiacal constellation of Cancer. It has an apparent visual magnitude of +3.5[3] and an absolute magnitude of −1.2.[11] Based on parallax measurements obtained during the Hipparcos mission, it is approximately 290 light-years distant from the Sun.[1] An exoplanet, designated Beta Cancri b, is believed to be orbiting the star.[23] Beta Cancri has a companion listed and together they are designated WDS J08165+0911. As the primary, Beta Cancri bears the designation WDS J08165+0911A.[1] The companion is designated WDS J08165+0911B.[3] Nomenclatureβ Cancri (Latinised to Beta Cancri) is the star's Bayer designation. WDS J08165+0911A is its designation in the Washington Double Star Catalog.[1]The star bore the traditional name of Al Tarf (anglicized as Altarf[27]), which can be translated from the Arabic as "end" or "edge". In 2016, the IAU organized a Working Group on Star Names (WGSN)[4] to catalog and standardize proper names for stars. The WGSN approved the name Tarf for Beta Cancri on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[2] PropertiesBeta Cancri is an orange K-type giant, about 50 times the radius of the Sun. It is Barium star, a type of cool giant showing enhanced abundances of Barium.[32] It is also suspected to vary slightly in brightness.[3] The companion is a red dwarf of the fourteenth magnitude. From its angular distance of 29 arcseconds, the companion's distance from Beta Cancri is estimated at some 2600 AU, with an orbital period of 76,000 years. PlanetIn 2014 evidence was presented of a planet orbiting Beta Cancri. Using radial velocity data from repeated observations of the star, the planet is estimated to have a minimum mass of approximately 7.8 times that of Jupiter, and an orbital period of 605 days.[23] {{OrbitboxPlanet begin| table_ref = [5] }}{{OrbitboxPlanet | exoplanet = b | mass = 7.8 ± 0.8 | semimajor = 1.7 ± 0.1 | period = 605.2 ± 4.0 | eccentricity = 0.08 ± 0.02 }}{{Orbitbox end}} References1. ^1 2 {{citation | title=bet Cnc -- High proper-motion Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HR+3249 | accessdate=2018-06-26 }} [6][7][8][9][10][11][12][13][14][15]2. ^1 {{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=18 June 2018}} 3. ^{{citation | title=UCAC4 496-050758 -- Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=WDS+J08165%2B0911B&submit=submit+id | accessdate=2018-06-26 }} 4. ^{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|accessdate=22 May 2016}} 5. ^{{cite web|url=http://exoplanet.eu/catalog/beta_cnc_b/|work=Extrasolar Planets Encyclopaedia|title=Notes on beta Cnc b|accessdate=28 February 2017}} 6. ^1 2 {{cite journal |title = Planetary companions in K giants β Cancri, μ Leonis, and β Ursae Minoris|author=Lee, B.-C.|author2=Han, I.|author3=Park, M.-G.|author4=Mkrtichian, D. E.|author5=Hatzes, A. P.|author6=Kim, K.-M. |journal = Astronomy & Astrophysics |date = 2014 |volume = 566 |pages=A67 |doi = 10.1051/0004-6361/201322608 |bibcode = 2014A&A...566A..67L |arxiv = 1405.2127}} 7. ^1 {{cite journal|bibcode=1991AJ....101.2229L|title=Taxonomy of barium stars|journal=Astronomical Journal|volume=101|pages=2229|author1=Lu|first1=Phillip K.|year=1991|doi=10.1086/115845}} 8. ^1 2 3 4 5 6 {{cite journal|bibcode= 2007A&A...474..653V |title= Validation of the new Hipparcos reduction |journal= Astronomy and Astrophysics |volume= 474 |issue= 2 |pages= 653 |author1= Van Leeuwen |first1= F. |year= 2007 |doi= 10.1051/0004-6361:20078357 |arxiv = 0708.1752 }} 9. ^1 2 3 {{cite journal|bibcode=2009yCat....102025S|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|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} 10. ^1 2 {{cite journal|bibcode=1986EgUBV........0M|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV data|author1=Mermilliod|first1=J.-C.|year=1986}} 11. ^1 {{cite journal|bibcode=2005A&A...430..165F|title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters|journal=Astronomy and Astrophysics|volume=430|pages=165|author1=Famaey|first1=B.|last2=Jorissen|first2=A.|last3=Luri|first3=X.|last4=Mayor|first4=M.|last5=Udry|first5=S.|last6=Dejonghe|first6=H.|last7=Turon|first7=C.|year=2005|doi=10.1051/0004-6361:20041272|arxiv = astro-ph/0409579 }} 12. ^1 2 3 4 5 6 {{cite journal|bibcode=2008AJ....135..209M|title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity|journal=The Astronomical Journal|volume=135|pages=209|author1=Massarotti|first1=Alessandro|last2=Latham|first2=David W.|last3=Stefanik|first3=Robert P.|last4=Fogel|first4=Jeffrey|year=2008|doi=10.1088/0004-6256/135/1/209}} 13. ^1 2 {{cite journal|bibcode=2001A&A...374.1085C|title=On the Wilson-Bappu relationship in the Mg II k line|journal=Astronomy and Astrophysics|volume=374|issue=3|pages=1085|author1=Cassatella|first1=A.|last2=Altamore|first2=A.|last3=Badiali|first3=M.|last4=Cardini|first4=D.|year=2001|doi=10.1051/0004-6361:20010816|arxiv = astro-ph/0106070 }} 14. ^1 {{cite journal|bibcode=1997A&A...319..881G|title=Absolute magnitudes and kinematics of barium stars|journal=Astronomy and Astrophysics|volume=319|pages=881|author1=Gomez|first1=A. E.|last2=Luri|first2=X.|last3=Grenier|first3=S.|last4=Prevot|first4=L.|last5=Mennessier|first5=M. O.|last6=Figueras|first6=F.|last7=Torra|first7=J.|year=1997}} 15. ^1 {{cite journal | bibcode=1995yCat.5050....0H | title=VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) | journal=VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H | volume=5050 | author1=Hoffleit | first1=D. | last2=Warren | first2=W. H. | year=1995 }} }}{{Stars of Cancer}} 12 : K-type giants|Binary stars|Suspected variables|Barium stars|Stars with proper names|Bayer objects|Cancer (constellation)|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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