| 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 |
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
- ^ 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.
