Sigma2 Cancri
White-hued subgiant star in the constellation Cancer
title: "Sigma2 Cancri" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["a-type-main-sequence-stars", "cancer-(constellation)", "bayer-objects", "bright-star-catalogue-objects", "durchmusterung-objects", "flamsteed-objects", "henry-draper-catalogue-objects", "hipparcos-objects"] description: "White-hued subgiant star in the constellation Cancer" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Sigma2_Cancri" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary White-hued subgiant star in the constellation Cancer ::
| name = Sigma2 Cancri | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Cancer | ra = | dec = | appmag_v = +5.436 | type = main sequence | class = A7 IV | b-v = +0.157 | u-b = | r-i = | variable = | radial_v = | prop_mo_ra = −53.031 | prop_mo_dec = −66.186 | pm_footnote = | parallax = 17.0377 | p_error = 0.0716 | parallax_footnote = | absmag_v = +1.57 | mass = 1.79 | radius = 2.28 | luminosity = 21.5 | temperature = | gravity = 4.17 | metal_fe = | rotational_velocity = 133 | age_myr = 441 | names = | Simbad = sig02+Cnc Sigma2 Cancri is a solitary, white-hued star in the constellation Cancer. Its name is a Bayer designation that is Latinized from σ2 Cancri, and abbreviated Sigma2 Cnc σ2 Cnc. This star is faintly visible to the naked eye, having an apparent visual magnitude of +5.44. Based upon an annual parallax shift of as seen from Earth, this star is located 191 ly from the Sun. It is drifting closer to the Sun with a radial velocity of −26 km/s.
With an estimated age of 441 million years, this is an A-type subgiant star with a stellar classification of A7 IV. It is spinning rapidly with a projected rotational velocity of 133 km/s. The star has an estimated 1.8 times the mass of the Sun with 2.3 times the Sun's radius. It is radiating 21.5 times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,309 K.
References
| 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=. }}
| title=The Tycho-2 catalogue of the 2.5 million brightest stars | display-authors=1 | last1=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. | journal=Astronomy and Astrophysics | volume=355 | pages=L27–L30 | date=March 2000 | bibcode=2000A&A...355L..27H | postscript=. | doi=10.1888/0333750888/2862}}
| 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=. }}
| last1=Zorec | first1=J. | last2=Royer | first2=F. | title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities | journal=Astronomy & Astrophysics | volume=537 | page=A120 | date=January 2012 | doi=10.1051/0004-6361/201117691 | bibcode=2012A&A...537A.120Z | arxiv=1201.2052 | s2cid=55586789 | postscript=. }}
| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146 | arxiv=1501.03154 | s2cid=33401607 | postscript=. }}
| title=sig02 Cnc | mode=cs2 | accessdate=2017-06-12 | postscript=. }}
References
- {{Cite Gaia DR3. 712942516481108992
- {{Cite XHIP. 43932
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