Location of κ Cancri (circled) | |
 A light curve for Kappa Cancri, plotted from TESS data | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 09 07 44.80955 |
| Declination | +10° 40′ 05.5196″ |
| Apparent magnitude (V) | +5.233 |
| Characteristics | |
| Spectral type | B8 IIIp |
| B−V color index | −0.113 |
| Variable type | α CVn |
| Astrometry | |
| Proper motion (μ) | RA: −18.31 mas/yr Dec.: −12.105 mas/yr |
| Parallax (π) | 5.3209 ± 0.1298 mas |
| Distance | 610 ± 10 ly (188 ± 5 pc) |
| Absolute magnitude (MV) | −0.82 |
| Orbit | |
| Period (P) | 6.3933 d |
| Eccentricity (e) | 0.13 |
| Periastron epoch (T) | 2440001.95 JD |
| Argument of periastron (ω) (secondary) | 157° |
| Semi-amplitude (K1) (primary) | 67.4 km/s |
| Details | |
| κ Cnc A | |
| Mass | 4.5 M☉ |
| Radius | 5.0 R☉ |
| Luminosity | 322 L☉ |
| Surface gravity (log g) | 3.7±0.1 cgs |
| Temperature | 12,800±200 K |
| Metallicity | +0.51 dex |
| Rotational velocity (v sin i) | 6±2 km/s |
| κ Cnc B | |
| Mass | 2.1 M☉ |
| Radius | 2.4 R☉ |
| Surface gravity (log g) | 4.0 cgs |
| Temperature | 8,500 K |
| Rotational velocity (v sin i) | 40 km/s |
| Other designations | |
| κ Cnc, 76 Cancri, BD+11°1984, FK5 1238, HD 78316, HIP 44798, HR 3623, SAO 98378 | |
| Database references | |
| SIMBAD | data |
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. The magnitude difference between the two stars is about 2.6. Based upon an annual parallax shift of 5.3209 mas as seen from the Earth, the system is located roughly 610 light-years from the Sun.
This is a single-lined spectroscopic binary star system with an orbital period of 6.39 days and an eccentricity of 0.13. The primary, component A, has a stellar classification of B8 IIIp, 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. 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 five days.
The primary component has 4.5 times the mass of the Sun, five 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.
References
- "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 5 December 2022.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Maza, Natalia L.; et al. (December 2014), "A non-LTE spectral analysis of the He and He isotopes in the HgMn star κ Cancri", Astronomy & Astrophysics, 572: 7, arXiv:1412.2052, Bibcode:2014A&A...572A.112M, doi:10.1051/0004-6361/201425037, S2CID 119116996, A112.
- ^ Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics, 19: 91, Bibcode:1975A&AS...19...91L.
- ^ Samus', N. N.; et al. (January 2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ Pourbaix, D.; et al. (2004), "SB: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- ^ Ryabchikova, T. (April 1998), "Abundance analysis of SB2 binary stars with HgMn primaries", Contributions of the Astronomical Observatory Skalnate Pleso, 27 (3): 319–323, arXiv:astro-ph/9805063, Bibcode:1998CoSka..27..319R.
- "kap Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-19.
- Ryabchikova, T.; et al. (April 1998), "Discovery of the secondary star of the HgMn binary kappa CANCRI", Contributions of the Astronomical Observatory Skalnate Pleso, 27 (3): 258–260, arXiv:astro-ph/9805143, Bibcode:1998CoSka..27..258R.
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