| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | 08h 40m 43.20548s[2] |
| Declination | +19° 43′ 09.5322″[2] |
| Apparent magnitude (V) | 6.83[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A7III[3] |
| B−V color index | 0.202±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | +34.6±0.9[1] km/s |
| Proper motion (μ) | RA: −35.946±0.032[2] mas/yr Dec.: −11.854±0.024[2] mas/yr |
| Parallax (π) | 5.3560±0.0311 mas[2] |
| Distance | 609 ± 4 ly (187 ± 1 pc) |
| Absolute magnitude (MV) | 0.56[1] |
| Details | |
| Mass | 2.39±0.03[4] M☉ |
| Radius | 4.22±0.27[4] R☉ |
| Luminosity | 53.8±0.21[5] L☉ |
| Surface gravity (log g) | 3.52±0.07[5] cgs |
| Temperature | 7,879±134[5] K |
| Metallicity [Fe/H] | −0.08±0.03[4] dex |
| Rotation | 2.06 days[6] |
| Rotational velocity (v sin i) | 195[7] km/s |
| Age | 603±28[4] Myr |
| Other designations | |
| 42 Cnc, BD+20°2172, GC 11916, HD 73785, HIP 42578, SAO 98030, PPM 125583[8] | |
| Database references | |
| SIMBAD | data |
42 Cancri is a single[9] star in the northern zodiac constellation of Cancer. With an apparent visual magnitude of 6.83,[1] 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.[1] 42 Cancri is a member of the Beehive Cluster (NGC 2632).[9]
The stellar classification of this star is A7III,[3] matching an A-type star that is in the giant stage. However, this may be a misclassification of a main sequence star.[10] It has also been classified as a spectroscopic binary,[7] although no orbital elements are published. 42 Cancri is an estimated 603[4] million years old and is spinning rapidly with a projected rotational velocity of 195 km/s.[7] The star has 2.39 times the mass of the Sun and 4.2 times the Sun's radius.[4] It is radiating 54 times the luminosity of the Sun from its photosphere at an effective temperature of 7,879 K.[5]
References
[edit]- ^ a b c d e f g 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.
- ^ a b c d e f 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.
- ^ a b 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.
- ^ a b c d e f 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.
- ^ a b c d 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.
- ^ 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.
- ^ a b c 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.
- ^ "42 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-08.
- ^ a b 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.
- ^ 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.
