Nu Cancri

Nu Cancri, Latinised from ν Cancri, is a binary star[6] in the zodiac constellation of Cancer. It is faintly visible to the naked eye with an apparent visual magnitude of +5.46.[2] Based upon an annual parallax shift of 8.31 mas as seen from the Earth,[1] the star is located roughly 390 light-years from the Sun.

Nu Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 09h 02m 44.26543s[1]
Declination +24° 27′ 10.4902″[1]
Apparent magnitude (V) +5.46[2]
Characteristics
Spectral type A0 III[3]
U−B color index −0.10[2]
B−V color index −0.03[2]
Astrometry
Radial velocity (Rv)−15.6±0.7[4] km/s
Proper motion (μ) RA: −2.48[1] mas/yr
Dec.: −7.67[1] mas/yr
Parallax (π)8.31 ± 0.35 mas[1]
Distance390 ± 20 ly
(120 ± 5 pc)
Absolute magnitude (MV)+0.05[5]
Orbit[6]
Period (P)1401.4 d
Eccentricity (e)0.35
Periastron epoch (T)2419687 Julian day
Argument of periastron (ω)
(secondary)		264°
Semi-amplitude (K1)
(primary)		7.7 km/s
Details
ν Cnc A
Mass2.82±0.13[7] M☉
Luminosity93[7] L☉
Temperature10,250[7] K
Metallicity [Fe/H]−0.20±0.04[5] dex
Rotational velocity (v sin i)18.9±0.4[7] km/s
Other designations
ν Cnc, 69 Cancri, BD+25° 2029, FK5 2714, HD 77350, HIP 44405, HR 3595, SAO 80595[8]
Database references
SIMBADdata

This is a single-lined spectroscopic binary system with an orbital period of 3.8 years and an eccentricity of 0.35. The primary, component A, is a white-hued A-type giant star with a stellar classification of A0 III.[3] It is a magnetic Ap star with a field strength of 846×10−4 T, showing abundance peculiarities in strontium, chromium and mercury.[7] The star has 2.8 times the mass of the Sun and is radiating 93 times the Sun's luminosity from its photosphere at an effective temperature of 10,250 K.[7]

References
  1. 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. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393 (3): 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.
  4. 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.
  5. 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.
  6. Pourbaix, D.; et al. (2004), "SB9: 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.
  7. Wraight, K. T.; et al. (February 2012), "A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society, 420 (1): 757–772, arXiv:1110.6283, Bibcode:2012MNRAS.420..757W, doi:10.1111/j.1365-2966.2011.20090.x, S2CID 14811051.
  8. "nu. Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-17.
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