Rho Piscium
| |
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
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Constellation | Pisces |
Right ascension | 01h 26m 15.26209s[1] |
Declination | +19° 10′ 20.4526″[1] |
Apparent magnitude (V) | +5.344[2] |
Characteristics | |
Spectral type | F2 V[3] |
B−V color index | +0.374[2] |
Astrometry | |
Radial velocity (Rv) | ±1.0 −7.7[4] km/s |
Proper motion (μ) | RA: −26.89[1] mas/yr Dec.: +11.12[1] mas/yr |
Parallax (π) | 39.66 ± 0.25[1] mas |
Distance | 82.2 ± 0.5 ly (25.2 ± 0.2 pc) |
Details | |
Mass | 1.31[5] M☉ |
Radius | 1.1[6] R☉ |
Luminosity | 3.6[7] L☉ |
Surface gravity (log g) | ±0.14 4.41[5] cgs |
Temperature | ±232 6,822[5] K |
Metallicity [Fe/H] | −0.31[8] dex |
Rotational velocity (v sin i) | 60.1[9] km/s |
Age | 778[5] Myr |
Other designations | |
Database references |
Rho Piscium (ρ Piscium) is a solitary,[11] yellow-hued star in the zodiac constellation of Pisces. With an apparent visual magnitude of +5.34,[2] it is faintly visible to the naked eye. Based upon an annual parallax shift of 39.66 mas as seen from Earth,[1] it is located 82 light years from the Sun. It is a member of the thin disk population of the Milky Way.[8]
This is an F-type main sequence star with a stellar classification of F2 V.[3] It is a suspected variable star that ranges in magnitude from a maximum of 5.35 to a minimum of 5.44 magnitude.[12] The star is a source of X-ray emission with a luminosity of ×1020 W. 117.6[13] It is 778[5] million years old and is spinning with a projected rotational velocity of 60.1 km/s.[9] The star has 1.3[5] times the mass of the Sun and about 1.1[6] times the Sun's radius. It is radiating 3.6[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,822 K.[5]
Naming
In Chinese, 右更 (Yòu Gèng), meaning Official in Charge of the Pasturing, refers to an asterism consisting of refers to an asterism consisting of ρ Piscium, η Piscium, π Piscium, ο Piscium and 104 Piscium. Consequently, ρ Piscium itself is known as 右更一 (Yòu Gèng yī, English: the First Star of Official in Charge of the Pasturing.)[14]
References
- 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
- 1 2 3 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.
- 1 2 Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I", The Astronomical Journal, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770 , doi:10.1086/504637.
- ↑ 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, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.
- 1 2 3 4 5 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, Bibcode:2015ApJ...804..146D, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.
- 1 2 Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (3rd ed.), 367: 521–24, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289 , doi:10.1051/0004-6361:20000451.
- 1 2 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.
- 1 2 Ibukiyama, A.; Arimoto, N. (November 2002), "HIPPARCOS age-metallicity relation of the solar neighbourhood disc stars", Astronomy and Astrophysics, 394: 927–941, Bibcode:2002A&A...394..927I, arXiv:astro-ph/0207108 , doi:10.1051/0004-6361:20021157.
- 1 2 Schröder, C.; et al. (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, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.
- ↑ "rho Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-25.
- ↑ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
- ↑ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, GCVS 5.1, 61 (1): 80−88, Bibcode:2017ARep...61...80S.
- ↑ Huensch, M.; et al. (October 1998), "The ROSAT all-sky survey catalogue of optically bright main-sequence stars and subgiant stars", Astronomy and Astrophysics Supplement, 132: 155−171, Bibcode:1998A&AS..132..155H, doi:10.1051/aas:1998287.
- ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日