Astronomy:Sigma1 Cancri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 52m 34.62123s[1] |
| Declination | +32° 28′ 26.9664″[1] |
| Apparent magnitude (V) | +5.68[2] |
| Characteristics | |
| Spectral type | A8 Vas[3] |
| U−B color index | +0.08[2] |
| B−V color index | +0.20[2] |
| Astrometry | |
| Radial velocity (Rv) | −13.5±4.3[4] km/s |
| Proper motion (μ) | RA: −4.41[1] mas/yr Dec.: +13.95[1] mas/yr |
| Parallax (π) | 15.51 ± 0.41[1] mas |
| Distance | 210 ± 6 ly (64 ± 2 pc) |
| Absolute magnitude (MV) | +1.62[5] |
| Details | |
| Mass | 1.70[6] M☉ |
| Luminosity | 18[7] L☉ |
| Surface gravity (log g) | 4.44[6] cgs |
| Temperature | 8,116±276[6] K |
| Rotational velocity (v sin i) | 84[7] km/s |
| Age | 301[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Sigma1 Cancri, Latinized from σ1 Cancri, is a solitary,[9] white-hued star in the zodiac constellation of Cancer. It is faintly visible to the naked eye, with an apparent visual magnitude of +5.68.[2] Based upon an annual parallax shift of 15.51 mas as seen from Earth,[1] this star is located around 210 light years from the Sun.
This is a chemically peculiar[7] A-type main sequence star with a stellar classification of A8 Vas.[3] At an age of about 301[6] million years, Sigma1 Cancri is around 67% of the way through its main sequence lifespan.[7] The star has 1.7[6] times the mass of the Sun and is radiating 18[7] times the Sun's luminosity from its photosphere at an effective temperature of 8,116 K.[6] It has a magnitude 13.3 visual companion at an angular separation of 5.2 arc seconds along a position angle of 276°, as of 2011.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (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.
- ↑ 2.0 2.1 2.2 2.3 Guetter, H. H.; Hewitt, A. V. (1984), "Photoelectric UBV photometry for 317 PZT and VZT stars", Astronomical Society of the Pacific 96: 441–443, doi:10.1086/131362, Bibcode: 1984PASP...96..441G.
- ↑ 3.0 3.1 Barry, Don C. (January 1970), "Spectral Classification of a and F Stars", Astrophysical Journal Supplement 19: 281, doi:10.1086/190209, Bibcode: 1970ApJS...19..281B.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 7.0 7.1 7.2 7.3 7.4 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ "* sig01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+sig01+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.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
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