42 Cancri

42 Cancri
Observation data
Epoch J2000      Equinox ICRS
Constellation Cancer
Right ascension 08h 40m 43.20548s
Declination +19° 43′ 09.5322″
Apparent magnitude (V) 6.83
Characteristics
Evolutionary stage main sequence
Spectral type A7III
B−V color index 0.202±0.004
Astrometry
Radial velocity (Rv)+34.6±0.9 km/s
Proper motion (μ) RA: −35.946±0.032 mas/yr
Dec.: −11.854±0.024 mas/yr
Parallax (π)5.3560±0.0311 mas
Distance609 ± 4 ly
(187 ± 1 pc)
Absolute magnitude (MV)0.56
Details
Mass2.39±0.03 M☉
Radius4.22±0.27 R☉
Luminosity53.8±0.21 L☉
Surface gravity (log g)3.52±0.07 cgs
Temperature7,879±134 K
Metallicity [Fe/H]−0.08±0.03 dex
Rotation2.06 days
Rotational velocity (v sin i)195 km/s
Age603±28 Myr
Other designations
42 Cnc, BD+20°2172, GC 11916, HD 73785, HIP 42578, SAO 98030, PPM 125583
Database references
SIMBADdata

42 Cancri is a single star in the northern zodiac constellation of Cancer. With an apparent visual magnitude of 6.83, it is dimmer than what is considered the normal lower limit for visibility with the naked eye. The star is located at a distance of approximately 616 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +35 km/s. 42 Cancri is a member of the Beehive Cluster (NGC 2632).

The stellar classification of this star is A7III, matching an A-type star that is in the giant stage. However, this may be a misclassification of a main sequence star. It has also been classified as a spectroscopic binary, although no orbital elements are published. 42 Cancri is an estimated 603 million years old and is spinning rapidly with a projected rotational velocity of 195 km/s. The star has 2.39 times the mass of the Sun and 4.2 times the Sun's radius. It is radiating 54 times the luminosity of the Sun from its photosphere at an effective temperature of 7,879 K.

References

  1. 1 2 3 4 5 6 7 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 Gray, R. O.; et al. (2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148, Bibcode:2001AJ....121.2148G, doi:10.1086/319956, S2CID 117076031.
  4. 1 2 3 4 5 6 Bochanski, John J.; et al. (April 2018), "Fundamental Properties of Co-moving Stars Observed by Gaia", The Astronomical Journal, 155 (4): 17, arXiv:1801.00537, Bibcode:2018AJ....155..149B, doi:10.3847/1538-3881/aaaebe, S2CID 119256051, 149.
  5. 1 2 3 4 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  6. ↑ Long, Liu; Bi, Shaolan; Zhang, Jinghua; Zhang, Xianfei; Zhang, Liyun; Ge, Zhishuai; Li, Tanda; Chen, Xunzhou; Li, Yaguang; Ye, Lifei; Sun, Tiancheng; Zhou, Jianzhao (2023). "Investigating 16 Open Clusters in the Kepler/K2-Gaia DR3 Field. I. Membership, Binary Systems, and Rotation". The Astrophysical Journal Supplement Series. 268 (1): 30. arXiv:2307.06596. Bibcode:2023ApJS..268...30L. doi:10.3847/1538-4365/ace5af.
  7. 1 2 3 Treanor, P. J. (1960), "Stellar rotation in galactic open clusters", Monthly Notices of the Royal Astronomical Society, 121 (6): 503, Bibcode:1960MNRAS.121..503T, doi:10.1093/mnras/121.6.503.
  8. ↑ "42 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-08.
  9. 1 2 Mason, Brian D.; et al. (August 1993), "ICCD Speckle Observations of Binary Stars. IX. A Duplicity Survey of the Pleiades, Praesepe, and IC 4665 Clusters", Astronomical Journal, 106: 637, Bibcode:1993AJ....106..637M, doi:10.1086/116669.
  10. ↑ Clampitt, Lori; Burstein, David (August 1997), "Spectrophotometry of 237 Stars in 7 Open Clusters", Astronomical Journal, 114: 699–712, arXiv:astro-ph/9705160, Bibcode:1997AJ....114..699C, doi:10.1086/118504, S2CID 15968133.