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.
| Observation data Epoch J2000.0 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 mas[1] |
| 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 |
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
edit- ^ a b c d e f van Leeuwen, F. (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 c Høg, E.; et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
- ^ a b c 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.
- ^ 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b c 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 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ a b c 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" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377[permanent dead link]
- ^ "ups01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-10.
- ^ 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.