| 释义 |
- References
{{about|A1 Cancri|other stars with this Bayer designation|A Cancri}}{{Starbox begin
| name = 45 Cancri
}}{{Starbox observe
| epoch = J2000.0
| constell = Cancer
| ra = {{RA|08|43|12.32940}}[1]
| dec = {{DEC|+12|40|51.1486}}[1]
| appmag_v = 5.62[3]
}}{{Starbox character
| type =
| class = {{nowrap|A3 III: + G7 III}}[4]
| b-v = {{Val|0.435|0.005}}[3]
| u-b =
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|−6.2|2.3}}[3]
| prop_mo_ra = −9.828[1]
| prop_mo_dec = +0.916[1]
| parallax = 4.7700
| p_error = 0.1025
| parallax_footnote = [1]
| absmag_v = −1.62[3]
}}{{Starbox orbit
| reference = [11]
| primary =
| name =
| period =
| period_unitless = {{Val|1009.36|0.12|u=days}}
| axis =
| axis_unitless =
| eccentricity = {{Val|0.461|0.002}}
| inclination =
| node =
| periastron =
| periarg =
| periarg_primary =
| k1 = {{Val|20.04|0.06}}
| k2 = {{Val|20.75|0.02}}
}}{{Starbox detail
| source =
| mass =
| radius =
| luminosity = 377.09[3]
| temperature = 5,058[13]
| gravity = 2.72[13]
| metal_fe = {{Val|−0.69|0.22}}[13]
| rotation =
| rotational_velocity = 5.3[16]
| age_myr =
}}{{Starbox catalog
| names = {{odlist | B=A1 Cancri,[17] | F=45 Cnc | BD=+13°1972 | FK5=2686 | HD=74228 | HIP=42795 | HR=3450 | SAO=98069 }}
}}{{Starbox reference
| Simbad = 45+Cnc
}}{{Starbox end}}45 Cancri is a binary star[11] system in the zodiac constellation of Cancer, located 680 light years away from the Sun.[1] It has the Bayer designation A1 Cancri,[17] (A1 Cnc); 45 Cancri is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star at an apparent visual magnitude of 5.62.[3] The pair form a double-lined spectroscopic binary with an orbital period of {{Convert|1009.36|days|years|disp=out|abbr=off|sigfig=3}} and an eccentricity of 0.46.[11]References1. ^1 2 3 4 5 6 {{Cite Gaia DR2|602321510603179264}}
2. ^1 2 3 4 5 6 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | arxiv=1108.4971 | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | postscript=. }}
3. ^1 {{citation | last1=Ginestet | first1=N. | last2=Carquillat | first2=J. M. | title=Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components | journal=The Astrophysical Journal Supplement Series | volume=143 | issue=2 | pages=513 | year=2002 | bibcode=2002ApJS..143..513G | doi=10.1086/342942 }}
4. ^1 2 3 {{citation | title=Models for 60 double-lined binaries containing giants | last1=Eggleton | first1=Peter P. | last2=Yakut | first2=Kadri | journal=Monthly Notices of the Royal Astronomical Society | volume=468 | issue=3 | pages=3533–3556 | date=July 2017 | doi=10.1093/mnras/stx598 | bibcode=2017MNRAS.468.3533E | arxiv=1611.05041 | postscript=. }}
5. ^1 2 3 {{citation | last1=Soubiran | first1=Caroline | last2=Le Campion | first2=Jean-François | last3=Brouillet | first3=Nathalie | last4=Chemin | first4=Laurent | title=The PASTEL catalogue: 2016 version | display-authors=1 | journal=Astronomy & Astrophysics | volume=591 | pages=A118 | year=2016 | bibcode=2016A&A...591A.118S | arxiv=1605.07384 | doi=10.1051/0004-6361/201628497 | postscript=. }}
6. ^1 {{citation | display-authors=1 | last1=Schröder | first1=C. | last2=Reiners | first2=A. | last3=Schmitt | first3=J. H. M. M. | title=Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo | journal=Astronomy and Astrophysics | volume=493 | issue=3 | pages=1099–1107 | date=January 2009 | doi=10.1051/0004-6361:200810377 | bibcode=2009A&A...493.1099S }}
7. ^1 2 HD 74228, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, N. D. Kostjuk, Institute of Astronomy of Russian Academy of Sciences, 2002; CDS ID IV/27A.
}}{{Stars of Cancer}} 9 : A-type giants|G-type giants|Cancer (constellation)|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |