34 Cancri

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
34 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension  08h 32m 39.87069s[1]
Declination +10° 03′ 57.6306″[1]
Apparent magnitude (V) 6.48[2]
Spectral type A1 V[3]
B−V color index −0.007±0.007[2]
Radial velocity (Rv)−11.0±7.4[4] km/s
Proper motion (μ) RA: +4.517[1] mas/yr
Dec.: −6.139[1] mas/yr
Parallax (π)5.7408 ± 0.0912[1] mas
Distance568 ± 9 ly
(174 ± 3 pc)
Absolute magnitude (MV)0.40[2]
Mass2.67±0.09[5] M
Radius2.7[6] R
Luminosity69.84[2] L
Temperature9,661±111[5] K
Rotational velocity (v sin i)18[5] km/s
Other designations
34 Cnc, BD+10°1818, GC 11689, HD 72359, HIP 41904, HR 3372, SAO 97902[7]
Database references

34 Cancri is a star in the zodiac constellation of Cancer, located about 568 light years away from the Sun.[1] It is a challenge to view with the naked even under good viewing conditions, having an apparent visual magnitude of 6.48.[2] At the distance of this star, its visual magnitude is diminished by an extinction of 0.14 due to interstellar dust.[8]

This is an A-type main-sequence star with a stellar classification of A1 V,[3] it is a chemically peculiar star, possibly of the magnetic-type (CP2), showing an abnormal abundance of strontium.[9] The star has only a moderate projected rotational velocity of 18 km/s,[5] it has an estimated 2.7[5] times the mass of the Sun and about 2.7[6] times the Sun's radius. The star is radiating 70[2] times the Sun's luminosity from its photosphere at an effective temperature of 9,661 K.[5]


  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f 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.
  3. ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  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, A61.
  5. ^ a b c d e f Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  6. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  7. ^ "34 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-28.
  8. ^ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035.
  9. ^ 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.