5 Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 01m 30.28830s[1] |
| Declination | +16° 27′ 19.1191″[1] |
| Apparent magnitude (V) | 5.99[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B9.5 Vn[4] |
| B−V color index | −0.024±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.0±1.5[5] km/s |
| Proper motion (μ) | RA: +4.12[6] mas/yr Dec.: −5.43[6] mas/yr |
| Parallax (π) | 6.2251±0.1419 mas [1] |
| Distance | 520 ± 10 ly (161 ± 4 pc) |
| Absolute magnitude (MV) | −0.09[2] |
| Details | |
| Mass | 2.93±0.10[3] M☉ |
| Radius | 3.1[7] R☉ |
| Luminosity | 121.1+20.2 −17.3[3] L☉ |
| Surface gravity (log g) | 4.5[4] cgs |
| Temperature | 9,727+90 −89[3] K |
| Rotational velocity (v sin i) | 188[3] km/s |
| Age | 36[4] Myr |
| Other designations | |
| 5 Cnc, BD+16°1612, HD 65873, HIP 39236, HR 3134, SAO 97485[8] | |
| Database references | |
| SIMBAD | data |
5 Cancri is a single[9] star in the zodiac constellation of Cancer, located around 520 light years away from the Sun. It is just visible to the naked eye under good seeing conditions as a dim, blue-white hued star with an apparent visual magnitude of 5.99.[2] This object is moving closer to the Sun with a heliocentric radial velocity of −10 km/s.[5]
At one point this was thought to be a spectroscopic binary system. It is a Be star with a weak circumstellar disk of gas that has around three times the radius of the host star.[10] The stellar classification of 5 Cancri is B9.5 Vn,[4] matching a B-type main-sequence star with "nebulous" lines due to rapid rotation. It is 36[4] million years old with a high projected rotational velocity of 188 km/s.[3] The star has 2.9[3] times the mass of the Sun and about 3.1[7] times the Sun's radius. It is radiating 121[3] times the Sun's luminosity from its photosphere at an effective temperature of 9,727 K.[3]
See also
[edit ]References
[edit ]- ^ a b c 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.
- ^ 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, S2CID 119257644.
- ^ a b c d e f g h i Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052 , Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b c d e Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 13, arXiv:1604.06456 , Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40 , S2CID 119179065, 40.
- ^ a b Becker, Juliette C.; et al. (April 2015), "Extracting Radial Velocities of A- and B-type Stars from Echelle Spectrograph Calibration Spectra", The Astrophysical Journal Supplement Series, 217 (2): 13, arXiv:1503.03874 , Bibcode:2015ApJS..217...29B, doi:10.1088/0067-0049/217/2/29, S2CID 33968873, 29.
- ^ a b van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752 , Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289 , Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ "5 Cnc". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019年02月23日.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879, arXiv:0806.2878 , Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x , S2CID 14878976.
- ^ Ghosh, K. K.; et al. (January 1999), "Observations of Bn and An stars: New Be stars", Astronomy and Astrophysics Supplement, 134 (2): 359–364, Bibcode:1999A&AS..134..359G, doi:10.1051/aas:1999144 .
