  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 19m 27.99289s [1] |
| Declination | +27° 15′ 50.6155″ [1] |
| Apparent magnitude (V) | 4.752 [2] |
| Characteristics | |
| Spectral type | A3 V [3] |
| U−B color index | +0.10 [2] |
| B−V color index | +0.03 [2] |
| Astrometry | |
| Radial velocity (Rv) | +5.8±2.7 [4] km/s |
| Proper motion (μ) |
RA: +22.98
[1]
mas/
yr Dec.: −11.12 [1] mas/ yr |
| Parallax (π) | 10.59 ± 0.25 mas [1] |
| Distance | 308 ± 7
ly (94 ± 2 pc) |
| Absolute magnitude (MV) | −0.13 [5] |
| Details | |
| Mass | 2.84±0.05 [3] M☉ |
| Radius | 2.2 [6] R☉ |
| Luminosity | 117 [3] L☉ |
| Surface gravity (log g) | 3.59 [7] cgs |
| Temperature | 9,183±312 [7] K |
| Metallicity [Fe/H] | +0.00±0.05 [8] dex |
| Rotational velocity (v sin i) | 91 [3] km/s |
| Age | 461 [7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon Piscium is a solitary, [10] white-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of +4.75. [2] Based upon an annual parallax shift of 10.59 mas as seen from Earth, [1] it is located about 308 light years from the Sun. The star is drifting further away with a heliocentric radial velocity of +6 km/s. [4]
This is an ordinary A-type main sequence star with a stellar classification of A3 V. [3] It is 461 [7] million years old – about 98% of the way through its main sequence lifetime [3] – and is spinning with a projected rotational velocity of 91 km/s. [3] The star has 2.8 [3] times the mass of the Sun, about 2.2 [6] times the Sun's radius, and is radiating 117 [3] times the Sun's luminosity from its photosphere at an effective temperature of 9183 K. [7]
Naming
υ Piscium is the Bayer designation for this star, which is Latinized as Upsilon Piscium. It has the Flamsteed designation 90 Piscium. [9]
In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism composed of υ Piscium, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, μ Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, the Chinese name for υ Piscium itself is 奎宿十三 (Kuí Sù shí sān, English: the Thirteenth Star of Legs.) [11]
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 d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ^ a b c d e f g h i Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv: 1201.2052, Bibcode: 2012A&A...537A.120Z, doi: 10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b 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.
- ^ 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 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c d e 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.
- ^ Morossi, C.; et al. (September 2002), "Metallicity Determinations from Ultraviolet-Visual Spectrophotometry. I. The Test Sample", The Astrophysical Journal, 577 (1): 377–388, Bibcode: 2002ApJ...577..377M, doi: 10.1086/342144.
- ^ a b "ups Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-24.
- ^ 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.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
