107 Piscium

107 Piscium is a single[13] star in the constellation of Pisces. 107 Piscium is the star's Flamsteed designation. John Flamsteed numbered the stars of Pisces from 1 to 113, publishing his Catalogus Britannicus in 1725. He accidentally numbered 107 Piscium twice, as he also allocated it the designation of 2 Arietis.[14] This star is faintly visible to the naked eye with an apparent visual magnitude that has been measured varying between 5.14 and 5.26.[2] However, that finding of variation was not confirmed by subsequent observations and is most likely spurious data.[6] It is located at a distance of about 24.8 light years away from the Sun.[1] 107 Piscium is drifting closer to the Sun with a radial velocity of −33.6,[7] and is predicted to come as close as 15.4 light-years in around 135,800 years.[15]

107 Piscium
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 01h 42m 29.76349s[1]
Declination +20° 16′ 06.6602″[1]
Apparent magnitude (V) 5.14 to 5.26[2]
Characteristics
Spectral type K1V[3]
U−B color index +0.49[4]
B−V color index +0.84[4]
V−R color index 0.5[5]
R−I color index +0.43[4]
Variable type Constant[6]
Astrometry
Radial velocity (Rv)−33.619±0.0013[7] km/s
Proper motion (μ) RA: −301.592[1] mas/yr
Dec.: −674.505[1] mas/yr
Parallax (π)131.4903 ± 0.1515[1] mas
Distance24.80 ± 0.03 ly
(7.605 ± 0.009 pc)
Absolute magnitude (MV)5.87[8]
Details[9]
Mass0.86 M☉
Radius0.82±0.03 R☉
Luminosity (bolometric)0.46[8] L☉
Surface gravity (log g)4.57±0.10 cgs
Temperature5,172±80 K
Metallicity [Fe/H]−0.01±0.07 dex
Rotation35.0 days[10]
Rotational velocity (v sin i)2.0±1.0 km/s
Age6.3[11] Gyr
Other designations
107 Psc, BD+19°279, GC 2080, HD 10476, HIP 7981, HR 493, SAO 74883, PPM 91014, CCDM J01425+2016A, WDS 01425+2016A, LFT 153, LHS 1287, LTT 10596, NLTT 5685[5][12]
Database references
SIMBADdata

This object is a K-type main-sequence star with a stellar classification of K1V,[3] indicating it is generating energy from core hydrogen fusion. It is somewhat older than the Sun—approximately 6 billion years old.[11] The star has 86% of the mass and 82% of the radius of the Sun,[9] but shines with only 46% of the Sun's luminosity.[8] The effective temperature of the star is 5,172 K.[9] It is rotating slowly with a period of 35.0 d.[10] The abundance of elements other than hydrogen and helium—the star's metallicity—is slightly lower than that of the Sun.[16] The level of chromospheric activity is similar to the Sun, and it shows a simple cycle of variation.[17][18]

107 Piscium has been examined for the presence of an infrared excess caused by exozodiacal dust, but none was detected.[19] The habitable zone for this star, defined as the locations where liquid water could be present on an Earth-like planet, is at a radius of 0.52–1.10 Astronomical Units (AU), where 1 AU is the average distance from the Earth to the Sun.[19]

In 1997, based on data collected during the Hipparcos mission, the star was categorized as an astrometric binary with a period of 0.576 years. However, this result has not been not confirmed.[20]

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. NSV 600, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 24, 2008.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. HR 493, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 24, 2008.
  5. "107 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 24, 2008.
  6. Lockwood, G. W.; et al. (August 1997). "The Photometric Variability of Sun-like Stars: Observations and Results, 1984-1995". The Astrophysical Journal. 485 (2). Bibcode:1997ApJ...485..789L. doi:10.1086/304453.
  7. Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795.
  8. HD 10476, catalog entry, Fundamental parameters and elemental abundances of 160 F-G-K stars based on OAO spectrum database, Y. Takeda, CDS ID J/PASJ/59/335; see also Publications of the Astronomical Society of Japan 59, #2 (April 2007), pp. 335–356, Bibcode:2007PASJ...59..335T.
  9. Fuhrmann, Klaus (2011). "Nearby stars of the Galactic disc and halo - V". Monthly Notices of the Royal Astronomical Society. 414 (4): 2893–2922. Bibcode:2011MNRAS.414.2893F. doi:10.1111/j.1365-2966.2011.18476.x.
  10. Maldonado, J.; et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics, 521: A12, arXiv:1007.1132, Bibcode:2010A&A...521A..12M, doi:10.1051/0004-6361/201014948.
  11. Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal, 687 (2): 1264–1293, arXiv:0807.1686, Bibcode:2008ApJ...687.1264M, doi:10.1086/591785.
  12. Entry 01425+2016, The Washington Double Star Catalog Archived 2008-04-12 at the Wayback Machine, United States Naval Observatory. Accessed on line September 24, 2008.
  13. Halbwachs, J. -L; et al. (2018). "Multiplicity among solar-type stars. IV. The CORAVEL radial velocities and the spectroscopic orbits of nearby K dwarfs". Astronomy and Astrophysics. 619: A81. arXiv:1808.04605. Bibcode:2018A&A...619A..81H. doi:10.1051/0004-6361/201833377. S2CID 119437322.
  14. Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy, 18 (3): 213, Bibcode:1987JHA....18..209W, doi:10.1177/002182868701800305
  15. Bailer-Jones, C.A.L.; et al. (2018). "New stellar encounters discovered in the second Gaia data release". Astronomy & Astrophysics. 616: A37. arXiv:1805.07581. Bibcode:2018A&A...616A..37B. doi:10.1051/0004-6361/201833456.
  16. HD 10476, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line November 19, 2008.
  17. Radick, Richard R.; et al. (March 2018). "Patterns of Variation for the Sun and Sun-like Stars". The Astrophysical Journal. 855 (2): 28. Bibcode:2018ApJ...855...75R. doi:10.3847/1538-4357/aaaae3. 75.
  18. Wright, J. T.; et al. (August 2008). "The Jupiter Twin HD 154345b". The Astrophysical Journal Letters. 683 (1). arXiv:0802.1731. Bibcode:2008ApJ...683L..63W. doi:10.1086/587461.
  19. Absil, O.; et al. (July 2013), "A near-infrared interferometric survey of debris-disc stars. III. First statistics based on 42 stars observed with CHARA/FLUOR", Astronomy and Astrophysics, 555: A104, arXiv:1307.2488, Bibcode:2013A&A...555A.104A, doi:10.1051/0004-6361/201321673.
  20. Agati, J.-L.; et al. (February 2015), "Are the orbital poles of binary stars in the solar neighbourhood anisotropically distributed?", Astronomy and Astrophysics, 574: A6, arXiv:1411.4919, Bibcode:2015A&A...574A...6A, doi:10.1051/0004-6361/201323056
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