Astronomy:Upsilon1 Cancri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 31m 30.51925s[1] |
| Declination | +24° 04′ 51.9890″[1] |
| Apparent magnitude (V) | +5.694[2] |
| Characteristics | |
| Spectral type | F0 IIIn[3] |
| B−V color index | +0.309[2] |
| Astrometry | |
| Radial velocity (Rv) | +19.0±4.3[4] km/s |
| Proper motion (μ) | RA: −81.36[1] mas/yr Dec.: −44.57[1] mas/yr |
| Parallax (π) | 13.05 ± 0.29[1] mas |
| Distance | 250 ± 6 ly (77 ± 2 pc) |
| Absolute magnitude (MV) | +1.29[5] |
| Details | |
| Mass | 1.47[6] M☉ |
| Luminosity | 25[5] L☉ |
| Surface gravity (log g) | 3.51[7] cgs |
| Temperature | 7,240±246[6] K |
| Rotational velocity (v sin i) | 109.2[7] km/s |
| Age | 570[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon1 Cancri, Latinised from υ1 Cancri, is the Bayer designation for a solitary,[3] yellow-white-hued star in the constellation Cancer. It is faintly visible with the naked eye, having an apparent visual magnitude of +5.7.[2] Based upon an annual parallax shift of 13.05 mas as seen from Earth,[1] this system is roughly 250 light-years from the Sun.
This object has a stellar classification of F0 IIIn, indicating it is an F-type giant star.[3] The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation, and it shows a relatively high projected rotational velocity of 109.2 km/s.[7] It is a variable star of unknown type that varies in brightness with an amplitude of 0.05 magnitude.[9] The star is about 570[6] million years old and it has an estimated mass of 1.47[6] times that of the Sun. On average, it is radiating 25[5] times the Sun's luminosity from its photosphere at an effective temperature of 7,240 K.[6]
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 Høg, E. et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics 355: L27–L30, doi:10.1888/0333750888/2862, Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 3.2 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.
- ↑ 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.
- ↑ 5.0 5.1 5.2 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 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 Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics 493 (3): 1099–1107, doi:10.1051/0004-6361:200810377, Bibcode: 2009A&A...493.1099S, http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2[yes|permanent dead link|dead link}}]
- ↑ "ups01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups01+Cnc.
- ↑ Adelman, S. J. (October 2000), "On the Variability of A3-F0 Luminosity Class III-V Stars", Information Bulletin on Variable Stars 4969 (4969): 1, Bibcode: 2000IBVS.4969....1A.
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