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{{Short description|Star in the constellation Cancer}}
{{Starbox short |
{{DISPLAYTITLE:Rho<sup>2</sup> Cancri}}
| name=ρ² Cancri
{{Starbox begin
| epoch=[[J2000.0]]
| name = Rho<sup>2</sup> Cancri
| constell=[[Cancer (constellation)|Cancer]]
| ra=08<sup>h</sup>55<sup>m</sup>39.7<sup>s</sup>
| dec=+27°55′39″
| spectral=G8II-III
| appmag_v=+5.23
| dist_ly=574 ± 85
| dist_pc=176 ± 26
| names=58&nbsp;Cancri, [[Harvard Revised catalogue|HR]]&nbsp;3540, [[Henry Draper Catalogue|HD]]&nbsp;76219, [[Bonner Durchmusterung|BD]]+28°1666, [[Fifth Fundamental Catalogue|FK5]]&nbsp;2705, [[Hipparcos catalogue|HIP]]&nbsp;43834, [[Smithsonian Astrophysical Observatory catalogue|SAO]]&nbsp;80511, GC&nbsp;12326
}}
}}
{{Starbox observe
{{downsize|title=Rho<sup>2</sup> Cancri}}
| epoch = [[J2000.0]]
| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell = [[Cancer (constellation)|Cancer]]
| ra = {{RA|08|55|39.68055}}<ref name=vanLeeuwen2007/>
| dec = {{DEC|+27|55|38.9299}}<ref name=vanLeeuwen2007/>
| appmag_v = 5.22<ref name=Fernie1983/>
}}
{{Starbox character
| class = G8&nbsp;III<ref name=Henry2000/> or G8&nbsp;II-III<ref name=Eggleton2008/>
| b-v = +1.00<ref name=Fernie1983/>
| u-b = +0.78<ref name=Fernie1983/>
| r-i =
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|+16.3|0.3}}<ref name=deBruijne2012/>
| prop_mo_ra = −12.24<ref name=vanLeeuwen2007/>
| prop_mo_dec = −33.79<ref name=vanLeeuwen2007/>
| parallax = 6.70
| p_error = 0.32
| parallax_footnote = <ref name=vanLeeuwen2007/>
| absmag_v = −1.13<ref name=Henry2000/>
}}
{{Starbox detail
| source =
| mass = 3.59<ref name=Takeda2008/>
| radius = 24.2<ref name=Henry2000/>
| luminosity = 310<ref name=Henry2000/>
| temperature = 4,994<ref name=luck2014/>
| gravity = 2.46<ref name=luck2014/>
| metal_fe = 0.11<ref name=luck2014/>
| rotational_velocity = 8.1<ref name=Henry2000/>
| age_myr = 234<ref name=Takeda2008/>
}}
{{Starbox catalog
| names = {{odlist | B=ρ<sup>2</sup> Cnc Cnc | F=58&nbsp;Cancri | FK5=2705 | BD=+28° 1666 | HD=76219 | HIP=43834 | HR=3540 | SAO=80511 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = rho02+Cnc
}}
{{starbox end}}
'''Rho<sup>2</sup> Cancri''' (ρ<sup>2</sup> Cancri) is a solitary,<ref name=Eggleton2008/> yellow-hued [[star]] in the [[constellation]] [[Cancer (constellation)|Cancer]]. With an [[apparent visual magnitude]] of 5.22,<ref name=Fernie1983/> it is visible to the naked eye on a dark night. Based upon an annual [[stellar parallax|parallax shift]] of 6.70&nbsp;[[milliarcsecond|mas]] as seen from Earth,<ref name=vanLeeuwen2007/> this star is located around 490&nbsp;[[light-year]]s from the [[Sun]]. At that distance, the visual magnitude is diminished by an [[extinction (astronomy)|extinction factor]] of 0.06 due to [[interstellar dust]].<ref name=Takeda2008/>


At the age of about 234<ref name=Takeda2008/>&nbsp;million years, is an [[stellar evolution|evolved]], [[G-type star|G-type]] [[giant star]] with a [[stellar classification]] of G8&nbsp;III.<ref name=Henry2000/> It has an estimated 3.6<ref name=Takeda2008/> times the [[mass of the Sun]] and has expanded to 24<ref name=Henry2000/> times the [[Sun's radius]]. It is radiating 310<ref name=Henry2000/> times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of {{val|4994|ul=K|fmt=commas}}.<ref name=luck2014/>
:''For other star systems with this [[Bayer designation]], see [[Rho Cancri]].''


==See also==
'''Rho² Cancri''' (ρ² Cnc / ρ² Cancri) is a [[star]] in the [[constellation]] [[Cancer (constellation)|Cancer]].
* [[55 Cancri]], or Rho<sup>1</sup> Cancri (ρ<sup>1</sup> Cnc)


==References==
ρ² Cancri is a yellow [[stellar classification|G-type]] [[bright giant]] with an [[apparent magnitude]] of +5.23. It is approximately 574 [[light years]] from [[Earth]].
{{reflist|refs=


<ref name=vanLeeuwen2007>{{citation
| 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=. }}</ref>

<ref name=Takeda2008>{{citation
| display-authors=1 | last1=Takeda | first1=Yoichi
| last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke
| title=Stellar Parameters and Elemental Abundances of Late-G Giants
| journal=Publications of the Astronomical Society of Japan
| volume=60 | issue=4 | pages=781–802 | date=August 2008
| bibcode=2008PASJ...60..781T | arxiv=0805.2434
| doi=10.1093/pasj/60.4.781 | postscript=. }}</ref>

<ref name=Eggleton2008>{{citation
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=[[Monthly Notices of the Royal Astronomical Society]]
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>

<ref name=deBruijne2012>{{citation
| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C.
| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project
| journal=Astronomy & Astrophysics
| volume=546 | id=A61 | pages=14 | date=October 2012
| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D
| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}</ref>

<ref name=luck2014>{{citation
| title=Parameters and Abundances in Luminous Stars
| journal=The Astronomical Journal | postscript=.
| last1=Luck | first1=R. Earle
| volume=147 | issue=6 | pages=137 | year=2014
| doi=10.1088/0004-6256/147/6/137 | bibcode=2014AJ....147..137L | doi-access=free }}</ref>

<ref name=Henry2000>{{citation | display-authors=1
| last1=Henry | first1=Gregory W. | last2=Fekel | first2=Francis C.
| last3=Henry | first3=Stephen M. | last4=Hall | first4=Douglas S.
| title=Photometric Variability in a Sample of 187 G and K Giants
| journal=The Astrophysical Journal Supplement Series
| volume=130 | issue=1 | pages=201–225 | date=September 2000
| doi=10.1086/317346 | bibcode=2000ApJS..130..201H | citeseerx=10.1.1.40.8526| s2cid=17160805 }}</ref>

<ref name=Fernie1983>{{citation
| last1=Fernie | first1=J. D. | postscript=.
| title=New UBVRI photometry for 900 supergiants
| journal=Astrophysical Journal Supplement Series
| volume=52 | pages=7–22 | date=May 1983
| doi=10.1086/190856 | bibcode=1983ApJS...52....7F | doi-access=free }}</ref>

<ref name=SIMBAD>{{cite simbad
| title=rho02 Cnc
| access-date=2017-06-13 }}</ref>

}}


{{Stars of Cancer|state=collapsed}}
{{star-stub}}


[[Category:Bayer objects|Cancri, Rho²]]
[[Category:G-type giants]]
[[Category:Cancer constellation]]
[[Category:Bayer objects|Cancri, Rho2]]
[[Category:Yellow bright giants]]
[[Category:Cancer (constellation)]]
[[Category:Durchmusterung objects|BD+28 1666]]
[[Category:Flamsteed objects|Cancri, 58]]
[[Category:Henry Draper Catalogue objects|076219]]
[[Category:Hipparcos objects|043834]]
[[Category:Bright Star Catalogue objects|3540]]

Latest revision as of 12:04, 11 November 2024

Rho2 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 08h 55m 39.68055s[1]
Declination +27° 55′ 38.9299″[1]
Apparent magnitude (V) 5.22[2]
Characteristics
Spectral type G8 III[3] or G8 II-III[4]
U−B color index +0.78[2]
B−V color index +1.00[2]
Astrometry
Radial velocity (Rv)+16.3±0.3[5] km/s
Proper motion (μ) RA: −12.24[1] mas/yr
Dec.: −33.79[1] mas/yr
Parallax (π)6.70 ± 0.32 mas[1]
Distance490 ± 20 ly
(149 ± 7 pc)
Absolute magnitude (MV)−1.13[3]
Details
Mass3.59[6] M☉
Radius24.2[3] R☉
Luminosity310[3] L☉
Surface gravity (log g)2.46[7] cgs
Temperature4,994[7] K
Metallicity [Fe/H]0.11[7] dex
Rotational velocity (v sin i)8.1[3] km/s
Age234[6] Myr
Other designations
ρ2 Cnc Cnc, 58 Cancri, BD+28° 1666, FK5 2705, HD 76219, HIP 43834, HR 3540, SAO 80511[8]
Database references
SIMBADdata

Rho2 Cancri (ρ2 Cancri) is a solitary,[4] yellow-hued star in the constellation Cancer. With an apparent visual magnitude of 5.22,[2] it is visible to the naked eye on a dark night. Based upon an annual parallax shift of 6.70 mas as seen from Earth,[1] this star is located around 490 light-years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.06 due to interstellar dust.[6]

At the age of about 234[6] million years, is an evolved, G-type giant star with a stellar classification of G8 III.[3] It has an estimated 3.6[6] times the mass of the Sun and has expanded to 24[3] times the Sun's radius. It is radiating 310[3] times the Sun's luminosity from its photosphere at an effective temperature of 4,994 K.[7]

See also

[edit]

References

[edit]
  1. ^ a b c d e f van Leeuwen, F. (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, S2CID 18759600.
  2. ^ a b c d Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7–22, Bibcode:1983ApJS...52....7F, doi:10.1086/190856.
  3. ^ a b c d e f g h Henry, Gregory W.; et al. (September 2000), "Photometric Variability in a Sample of 187 G and K Giants", The Astrophysical Journal Supplement Series, 130 (1): 201–225, Bibcode:2000ApJS..130..201H, CiteSeerX 10.1.1.40.8526, doi:10.1086/317346, S2CID 17160805
  4. ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  5. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. ^ a b c d e Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781.
  7. ^ a b c d Luck, R. Earle (2014), "Parameters and Abundances in Luminous Stars", The Astronomical Journal, 147 (6): 137, Bibcode:2014AJ....147..137L, doi:10.1088/0004-6256/147/6/137.
  8. ^ "rho02 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-13.
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