57 Cancri
{{Short description|Star in the constellation Cancer}}
{{Starbox begin
| name = 57 Cancri
}}
{{Starbox observe
| epoch = J2000.0
| constell = Cancer
| dec = {{DEC|+30|34|44.8283}}
| appmag_v = {{nowrap|+5.40 (6.09 + 6.37)}}
}}
{{Starbox character
| type =
| class = {{nowrap|G7 III + K0 III}}
| u-b =
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|−59.2|0.4}}
| parallax = 7.07
| p_error = 0.68
}}
{{Starbox detail
| component1 = 57 Cnc A
| mass = {{Val|6.49|2.16}}
| radius =
| temperature = {{Val|4810|92|fmt=commas}}
| gravity = {{Val|2.74|0.11}}
| metal_fe = {{Val|0.08|0.05}}
| rotational_velocity =
| age_myr = {{Val|645|154|120}}
}}
{{Starbox catalog
| names = {{odlist | F=57 Cnc | BD=+31°1907 | HD=75959 | HIP=43721 | HR=3532 | SAO=61125 | GC=12289 | ADS=7071 | WDS=J08542+3035 }}
}}
{{Starbox reference
| Simbad = 57+Cnc
}}
{{Starbox end}}
57 Cancri is a double star in the zodiac constellation of Cancer, located around 460 light years away from the Sun. They are visible to the naked eye as a faint star with a combined apparent visual magnitude of +5.40. The brighter member, designated component A. is a yellow-hued giant star with a stellar classification of G7 III and an apparent magnitude of +6.09. Its companion, component B, is an orange-hued giant with a class of K0 III and an apparent magnitude of +6.37. As of 2017, the pair had an angular separation of {{Val|1.50|ul=arcsecond}} along a position angle of 310°.
References
{{Reflist|refs=
{{cite simbad | title=57 Cnc | access-date=2019-03-06 }}
| last1=Abt | first1=Helmut A. | postscript=.
| title=Visual Multiples. IX. MK Spectral Types
| journal=The Astrophysical Journal Supplement Series
| volume=176 | pages=216–217 | year=2008
| issue=1 | bibcode=2008ApJS..176..216A | doi=10.1086/525529 | doi-access=free }}
| 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
| s2cid=119257644 | postscript=. }}
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| 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 | s2cid=18759600 | postscript=. }}
| title=Determining Ages of APOGEE Giants with Known Distances
| journal=The Astrophysical Journal
| display-authors=1 | last1=Feuillet | first1=Diane K.
| last2=Bovy | first2=Jo | last3=Holtzman | first3=Jon
| last4=Girardi | first4=Léo | last5=MacDonald | first5=Nick
| last6=Majewski | first6=Steven R. | last7=Nidever | first7=David L.
| volume=817 | pages=40 | year=2016
| issue=1
| bibcode=2016ApJ...817...40F | arxiv=1511.04088
| doi=10.3847/0004-637X/817/1/40 | s2cid=118675933
| postscript=. | doi-access=free
}}
| display-authors=1 | last1=Mason | first1=B. D.
| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.
| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.
| title=The Washington Visual Double Star Catalog | journal=The Astronomical Journal | year=2014
| volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | doi-access=free }}
}}
{{Stars of Cancer}}
{{DEFAULTSORT:57 Cancri}}
Category:Cancer (constellation)