29 Cancri

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29 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension  08h 28m 37.33859s[1]
Declination +12° 39′ 16.6066″[1]
Apparent magnitude (V) 5.94[2]
Spectral type A5 V[3]
B−V color index 0.201±0.010[2]
Radial velocity (Rv)+2.0±4.3[4] km/s
Proper motion (μ) RA: −13.928[1] mas/yr
Dec.: −12.558[1] mas/yr
Parallax (π)8.8043 ± 0.0747[1] mas
Distance370 ± 3 ly
(113.6 ± 1.0 pc)
Absolute magnitude (MV)0.83[2]
Mass2.30±0.04[5] M
Radius1.9[6] R
[5] L
Temperature7,727±71[5] K
Rotational velocity (v sin i)117[5] km/s
Other designations
29 Cnc, BD+14°1899, FK5 1222, HD 71555, HIP 41578, HR 3333, SAO 97843[7]
Database references

29 Cancri is a star in the zodiac constellation of Cancer, located 370 light years from the Sun. It is just visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.94.[2] The star is situated near the ecliptic, which means it is subject to lunar occultations.[8]

This is an A-type main-sequence star with a stellar classification of A5 V,[3] which indicates it is generating energy through hydrogen fusion at its core, it has 2.3[5] times the mass of the Sun and around 1.9[6] times the Sun's radius. The star has a relatively high rate of rotation, showing a projected rotational velocity of 117 km/s,[5] it is radiating 45[5] times the Sun's luminosity from its photosphere at an effective temperature of 7,727 K.[5]


  1. ^ a b c d e 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 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 Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182
  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 g h 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. ^ "29 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-27.
  8. ^ Radick, R.; Lien, D. (August 1980), "Illinois occultation summary. I. 1977-1978", Astronomical Journal, 85: 1053–1061, Bibcode:1980AJ.....85.1053R, doi:10.1086/112767.