Astronomy:Omicron1 Cancri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 57m 14.95026s[1] |
| Declination | +15° 19′ 21.9512″[1] |
| Apparent magnitude (V) | +5.20[2] |
| Characteristics | |
| Spectral type | A5 III[3] |
| B−V color index | +0.1540[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.6±2.8[4] km/s |
| Proper motion (μ) | RA: +61.47[1] mas/yr Dec.: +19.40[1] mas/yr |
| Parallax (π) | 21.87 ± 0.26[1] mas |
| Distance | 149 ± 2 ly (45.7 ± 0.5 pc) |
| Absolute magnitude (MV) | +1.92[5] |
| Details | |
| Mass | 2.02[6] M☉ |
| Radius | 1.86[7] R☉ |
| Luminosity | 13.4[8] L☉ |
| Surface gravity (log g) | 4.16[6] cgs |
| Temperature | 8,636±294[6] K |
| Rotational velocity (v sin i) | 90[6] km/s |
| Age | 598[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omicron1 Cancri, Latinised from ο1 Cancri, is a solitary,[10] white-hued star in the zodiac constellation of Cancer. It is visible to the naked eye with an apparent visual magnitude of +5.20.[2] Based upon an annual parallax shift of 21.87 mas as seen from Earth,[1] this star is located around 149 light-years from the Sun. It most likely forms a co-moving pair with Omicron2 Cancri.[11]
With a stellar classification of A5 III,[3] this appears to be an evolved, A-type giant star. At the age of about 600 million years,[6] it has double[6] the mass of the Sun and 1.86 times the Sun's radius.[7] Omicron1 Cancri is radiating 13.4[8] times the solar luminosity from its photosphere at an effective temperature of about 8,636 K.[6]
Omicron1 Cancri has an infrared excess, indicating it surrounded by a circumstellar debris disk.[7] The signature matches a two-component disk with the spatially separated belts having temperatures of 146 K and 81 K.[8]
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 Häggkvist, L.; Oja, T. (1966), "Photoelectric photometry of bright stars", Arkiv för Astronomi 4: 137–163, Bibcode: 1966ArA.....4..137H.
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
- ↑ 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 6.7 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 Rhee, Joseph H. et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs", The Astrophysical Journal 660 (2): 1556–1571, doi:10.1086/509912, Bibcode: 2007ApJ...660.1556R.
- ↑ 8.0 8.1 8.2 Vican, Laura et al. (December 2016), "Herschel Observations of Dusty Debris Disks", The Astrophysical Journal 833 (2): 19, doi:10.3847/1538-4357/833/2/263, 263, Bibcode: 2016ApJ...833..263V.
- ↑ "omi01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=omi01+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.
- ↑ Shaya, Ed J.; Olling, Rob P. (January 2011), "Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue", The Astrophysical Journal Supplement 192 (1): 17, doi:10.1088/0067-0049/192/1/2, 2, Bibcode: 2011ApJS..192....2S.
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