| 词条 | 52 Cygni |
| 释义 |
| image={{Location mark |image=Cygnus constellation map.svg|alt=|float=center|width=240 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=52 Cygni |x=264|y=625 }} |caption=Location of 52 Cygni (circled) }}{{Starbox observe 2s | epoch=J2000 | constell=Cygnus | component1=A | ra1={{RA|20|45|39.75304}} | dec1={{DEC|+30|43|10.9756}} | appmag_v1=4.22[3] | component2=B | ra2={{RA|20|45|40.206}}[4] | dec2={{DEC|+30|43|12.96}}[4] | appmag_v2=11.06[4] }}{{Starbox character | class=G9.5III[7] | b-v=+1.05[3] | u-b=+0.88[3] | variable= }}{{Starbox astrometry | radial_v=–0.72[10] | prop_mo_ra=–8.98 | prop_mo_dec=+24.11 | parallax=16.22 | p_error=0.19 | parallax_footnote= | absmag_v= }}{{Starbox detail | mass=2.07[14] | radius=13.81[14] | luminosity=89[16] | temperature=4,677[16] | metal_fe=−0.24[16] | gravity=2.5[16] | rotational_velocity=3.7[16] | age_gyr=2.27[14] }}{{Starbox catalog | names=ADS 14259, BD+30 4167, WDS J20456+3043, CCDM J20457+3043 | component1=A | names1=HR 7942, HD 197912, HIP 102453, SAO 70467 | component2=B | names2=TYC 2687-2652-1 }}{{Starbox reference | Simbad=52+Cygni|sn=A | Simbad2=52+Cygni+B|sn2=B }}{{Starbox end}} 52 Cygni is a giant star in the northern constellation of Cygnus with an apparent magnitude of 4.22. Based on its Hipparcos parallax, it is about {{convert|291|ly|pc}} away. 52 Cygni is a probable horizontal branch (red clump) star, fusing helium in its core, although there is a 25% chance that it is still on the red giant branch (RGB) and fusing hydrogen in a shell around an insert core. As a clump giant it would be 2.27 gyr old, but only 910 myr if it is an RGB star.[14] It shines with a bolometric luminosity of about {{solar luminosity|90}} at an effective temperature of 4,677 K.[16] It has a radius of {{solar radius|about 14}}.[14] At an angular separation of 6.0″ from 52 Cygni is a faint magnitude 9.5 companion.[7] References1. ^1 {{citation | display-authors=1 | last1=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. | 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 | issue=1 | pages=165–186 | date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579}} Vizier catalog entry[1][2][3][4][5][6]2. ^1 2 3 4 5 6 {{citation | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 | date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M}} 3. ^1 2 3 {{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | journal=Catalogue of Eggen's UBV data. SIMBAD | date=1986 | bibcode=1986EgUBV........0M}} 4. ^1 2 {{Cite journal | doi = 10.1111/j.1365-2966.2008.13596.x| title = A catalogue of multiplicity among bright stellar systems| year = 2008| last1 = Eggleton | first1 = P. P.| last2 = Tokovinin | first2 = A. A.| journal = Monthly Notices of the Royal Astronomical Society| volume = 389| issue = 2| pages = 869| bibcode = 2008MNRAS.389..869E|arxiv = 0806.2878 }} 5. ^1 2 3 {{cite journal | bibcode=2000A&A...355L..27H | title=The Tycho-2 catalogue of the 2.5 million brightest stars | journal=Astronomy and Astrophysics | volume=355 | pages=L27 | author1=Høg | first1=E. | last2=Fabricius | first2=C. | last3=Makarov | first3=V. V. | last4=Urban | first4=S. | last5=Corbin | first5=T. | last6=Wycoff | first6=G. | last7=Bastian | first7=U. | last8=Schwekendiek | first8=P. | last9=Wicenec | first9=A. | year=2000 }} 6. ^1 2 3 4 5 {{cite journal|doi=10.1051/0004-6361/201322360|arxiv=1412.4634|title=Precise radial velocities of giant stars|journal=Astronomy & Astrophysics|volume=574|pages=A116|year=2015|last1=Reffert|first1=Sabine|last2=Bergmann|first2=Christoph|last3=Quirrenbach|first3=Andreas|last4=Trifonov|first4=Trifon|last5=Künstler|first5=Andreas|bibcode=2015A&A...574A.116R}} }}{{Stars of Cygnus|state=collapsed}} 9 : G-type giants|Horizontal-branch stars|Binary stars|Cygnus (constellation)|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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