Astronomy:5 Cancri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 | |
| 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
- Cancer (Chinese astronomy)
- List of stars in Cancer
References
- ↑ 1.0 1.1 1.2 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 4.0 4.1 4.2 4.3 4.4 Gullikson, Kevin et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal 152 (2): 13, doi:10.3847/0004-6256/152/2/40, 40, Bibcode: 2016AJ....152...40G.
- ↑ 5.0 5.1 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, doi:10.1088/0067-0049/217/2/29, 29, Bibcode: 2015ApJS..217...29B.
- ↑ 6.0 6.1 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ "5 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=5+Cnc.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Ghosh, K. K. et al. (January 1999), "Observations of Bn and An stars: New Be stars", Astronomy and Astrophysics Supplement 134 (2): 359–364, doi:10.1051/aas:1999144, Bibcode: 1999A&AS..134..359G.
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