| absmag_v = −0.82[10]
}}{{Starbox orbit
| reference = [11]
| period_unitless = 6.3933 d
| eccentricity = 0.13
| periastron = 2440001.95 JD
| periarg = 157
| k1 = 67.4
}}{{Starbox detail
| source = [12]
| component1 = κ Cnc A
| mass = 4.5
| radius = 5.0
| luminosity = 322[10]
| temperature = {{Val|12800|200|fmt=commas}}[3]
| gravity = {{Val|3.7|0.1}}[3]
| metal_fe = +0.51[10]
| rotational_velocity = {{Val|6|2}}[3]
| age_myr =
| component2 = κ Cnc B
| mass2 = 2.1
| radius2 = 2.4
| temperature2 = 8,500
| gravity2 = 4.0
| rotational_velocity2 = 40
}}{{Starbox catalog
| names = {{odlist | B=κ Cnc | F=76 Cancri | FK5=1238 | BD=+11° 1984 | HD=78316 | HIP=44798 | HR=3623 | SAO=98378 }}[18]
}}{{Starbox reference
| Simbad = kap+Cnc
}}{{starbox end}}Kappa Cancri, Latinized from κ Cancri, is a blue-white hued binary star system in the zodiac constellation of Cancer. It is faintly visible to the naked eye with an apparent visual magnitude of +5.23.[3] The magnitude difference between the two stars is about 2.6.[20] Based upon an annual parallax shift of 7.13 mas as seen from the Earth,[ the system is located roughly 460 light years from the Sun.]
This is a single-lined spectroscopic binary[3] star system with an orbital period of 6.39 days and an eccentricity of 0.13.[11] The primary, component A, has a stellar classification of B8 IIIp,[4] suggesting it is a B-type giant star. It a mercury-manganese star, a type of chemically peculiar star showing large overabundances of those two elements in the outer atmosphere.[3] It is classified as an Alpha2 Canum Venaticorum type variable star and its brightness varies from magnitude +5.22 to +5.27 with a period of 5 days.[6]
The primary component has 4.5 times the mass of the Sun, 5 times the Sun's radius, and an effective temperature of 13,200 K. The secondary, component B, is a smaller star with 2.1 times the mass and 2.4 times the radius of the Sun, having an effective temperature of 8,500 K.[12]
References
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4. ^1 2 {{citation | last1=Levato | first1=H. | title=Rotational velocities and spectral types for a sample of binary systems | journal=Astronomy and Astrophysics | volume=19 | pages=91 | year=1975 | bibcode=1975A&AS...19...91L | postscript=. }}
5. ^1 2 {{citation | title=SB9: The ninth catalogue of spectroscopic binary orbits | journal=Astronomy & Astrophysics | display-authors=1 | last1=Pourbaix | first1=D. | last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H. | last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I. | last6=Levato | first6=H. | last7=Morrell | first7=N. I. | last8=Torres | first8=G. | last9=Udry | first9=S. | volume=424 | issue=2 | pages=727 | date=2004 | doi=10.1051/0004-6361:20041213 | bibcode=2004A&A...424..727P | arxiv=astro-ph/0406573 | postscript=. }}
6. ^1 2 3 4 5 6 7 8 {{citation | title=A non-LTE spectral analysis of the 3He and 4He isotopes in the HgMn star κ Cancri | display-authors=1 | last1=Maza | first1=Natalia L. | last2=Nieva | first2=María-Fernanda | last3=Przybilla | first3=Norbert | journal=Astronomy & Astrophysics | postscript=. | volume=572 | id=A112 | pages=7 | date=December 2014 | doi=10.1051/0004-6361/201425037 | bibcode=2014A&A...572A.112M |arxiv = 1412.2052 }}
7. ^1 2 {{citation | last1=Ryabchikova | first1=T. | postscript=. | title=Abundance analysis of SB2 binary stars with HgMn primaries | journal=Contributions of the Astronomical Observatory Skalnate Pleso | volume=27 | issue=3 | pages=319–323 |date=April 1998 | bibcode=1998CoSka..27..319R | arxiv=astro-ph/9805063 }}
8. ^1 {{cite simbad | title=kap Cnc | accessdate=2017-06-19 | postscript=. }}