35 Cancri

35 Cancri is a star in the zodiac constellation of Cancer, located 630 light years from the Sun. It is a challenge to view with the naked eye even under good seeing conditions, having an apparent visual magnitude of +6.55.^[2] The star is moving further from the Earth with a heliocentric radial velocity of +35 km/s,^[2] and is a member of the Beehive Cluster.^[8]

35 Cancri

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cancer
Right ascension	08h 35m 19.44616s[1]
Declination	+19° 35′ 24.2308″[1]
Apparent magnitude (V)	+6.55[2]
Characteristics
Evolutionary stage	subgiant[3]
Spectral type	G0 III[4]
B−V color index	+0.681±0.013[2]
Astrometry
Radial velocity (Rv)	+34.9±1.2[2] km/s
Proper motion (μ)	RA: −34.582[1] mas/yr Dec.: −12.417[1] mas/yr
Parallax (π)	5.1788 ± 0.0588 mas[1]
Distance	630 ± 7 ly (193 ± 2 pc)
Absolute magnitude (MV)	0.22[2]
Details
Mass	1.072[5] M☉
Radius	0.981[5] R☉
Luminosity	77.23[2] L☉
Temperature	5,950[6] K
Rotation	0.501 d[5]
Rotational velocity (v sin i)	99.0[5] km/s
Other designations
35 Cnc, BD+20°2118, GC 11904, HD 72779, HIP 42133, HR 3387, SAO 97928[7]
Database references
SIMBAD	data

This is a subgiant star^[3] with a stellar classification of G0 III.^[4] It is rotating at a relatively fast clip, giving it an oblate shape with an equatorial bulge that is 5% larger than the polar radius.^[9] 35 Cancri has a projected rotational velocity of 99 km/s^[5] and a rotation period of 0.5 days.^[5] This rotation is expected to decrease significantly as the star expands into a giant.^[4] It has nearly the same mass and size as the Sun,^[5] but is radiating 77^[2] times the Sun's luminosity from its photosphere at an effective temperature of 5,950 K.^[6]

References

1. 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. 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.
3. Yang, X. L.; et al. (November 2015), "Chemical Abundances of Member Stars in the Open Cluster NGC 2632 (Praesepe)", The Astronomical Journal, 150 (5): 10, Bibcode:2015AJ....150..158Y, doi:10.1088/0004-6256/150/5/158, S2CID 125381412, 158
4. 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.
5. van Saders, Jennifer L.; Pinsonneault, Marc H. (October 2013), "Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic", The Astrophysical Journal, 776 (2): 20, arXiv:1306.3701, Bibcode:2013ApJ...776...67V, doi:10.1088/0004-637X/776/2/67, S2CID 119097746, 67.
6. Muñoz Bermejo, J.; et al. (May 2013), "A PCA approach to stellar effective temperatures", Astronomy and Astrophysics, 453: A95, arXiv:1303.7218, Bibcode:2013A&A...553A..95M, doi:10.1051/0004-6361/201220961, S2CID 67752733.
7. "35 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-28.
8. Wang, P. F.; et al. (March 2014), "Characterization of the Praesepe Star Cluster by Photometry and Proper Motions with 2MASS, PPMXL, and Pan-STARRS", The Astrophysical Journal, 784 (1): 10, arXiv:1401.7424, Bibcode:2014ApJ...784...57W, doi:10.1088/0004-637X/784/1/57, S2CID 59406128, 57.
9. van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.