107 Piscium
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 42m 29.7619s[1] |
| Declination | +20° 16′ 06.616″[1] |
| Apparent magnitude (V) | 5.14 to 5.26[2] |
| Characteristics | |
| Spectral type | K1V[1] |
| U−B color index | +0.49[3] |
| B−V color index | +0.84[3] |
| V−R color index | 0.5[1] |
| R−I color index | +0.43[3] |
| Variable type | Suspected[2] |
| Astrometry | |
| Radial velocity (Rv) | −33.5 ± 0.9[1] km/s |
| Proper motion (μ) | RA: −302.14[1] mas/yr Dec.: −677.46[1] mas/yr |
| Parallax (π) | 133.92 ± 0.91[1] mas |
| Distance | 24.4 ± 0.2 ly (7.47 ± 0.05 pc) |
| Absolute magnitude (MV) | 5.87[4] |
| Details | |
| Mass | 0.83 (0.80 to 0.89)[5] M☉ |
| Radius | 0.80 ± 0.06[6] R☉ |
| Luminosity (bolometric) | 0.46[4] L☉ |
| Surface gravity (log g) | 4.50[4] cgs |
| Temperature | 5242 ± 3.2[7] K |
| Metallicity [Fe/H] | −0.04[5] dex |
| Rotation | 35.0 days[8] |
| Rotational velocity (v sin i) | 1[5] km/s |
| Age | 6.3[9] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
107 Piscium (abbreviated 107 Psc) is a K-type main sequence star in the constellation of Pisces, about 24.4 light years away from the Earth.[1] 107 Piscium is the Flamsteed designation. It has an apparent visual magnitude which varies between 5.14 and 5.26.[2]
Naming
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.[11]
Properties
The star is somewhat older than the Sun—approximately 6 billion years old.[9] It has 83%[5] of the mass and 80%[6] of the radius of the Sun, but shines with only 46% of the Sun's luminosity.[4] The effective temperature of the star is 5,242 K.[7] It is rotating slowly with a period of 35.0 days.[8] The abundance of elements other than hydrogen and helium—the star's metallicity—is slightly lower than that of the Sun.[5]
107 Piscium has been examined for the presence of an infrared excess caused by exozodiacal dust, but none was detected.[12] 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.[12]
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.[13]
Visual companions
The star has two visual companions, WDS 01425+2016B and WDS 01425+2016C; C is optical.[14]
| Multiple/double star designation: WDS 01425+2016[10] | ||||||||
|---|---|---|---|---|---|---|---|---|
| Component | Primary | Right ascension (α) Equinox J2000.0 | Declination (δ) Equinox J2000.0 | Epoch of observed separation | Angular distance from primary | Position angle (relative to primary) | Apparent magnitude (V) | Database reference |
| B | A | 01h 42m 29.5s | +20° 16′ 33″[15] | 1910 | 19.0″ | 248° | 11.7 | Simbad |
| C | A | 01h 42m 29.8s | +20° 18′ 23″[16] | 1924 | 104.4″ | 353° | 12.1 | Simbad |
See also
References
- 1 2 3 4 5 6 7 8 9 10 NSV 600 -- Variable Star, database entry, SIMBAD. Accessed on line September 24, 2008.
- 1 2 3 NSV 600, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 24, 2008.
- 1 2 3 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.
- 1 2 3 4 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.
- 1 2 3 4 5 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.
- 1 2 Perrin, M.-N. (1987), "Stellar radius determination from IRAS 12-micron fluxes", Astronomy and Astrophysics 172: 235–240, Bibcode:1987A&A...172..235P.
- 1 2 Kovtyukh; Soubiran, C.; Belik, S. I.; Gorlova, N. I. (2003), "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios", Astronomy and Astrophysics 411 (3): 559–564, arXiv:astro-ph/0308429, Bibcode:2003A&A...411..559K, doi:10.1051/0004-6361:20031378.
- 1 2 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.
- 1 2 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.
- 1 2 Entry 01425+2016, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line September 24, 2008.
- ↑ Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy 18 (3): 213, Bibcode:1987JHA....18..209W
- 1 2 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.104, doi:10.1051/0004-6361/201321673.
- ↑ 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
- ↑ Entry 01425+2016, The Washington Double Star Catalog, notes, United States Naval Observatory. Accessed on line September 24, 2008.
- ↑ BD+19 279B -- Star in double system, database entry, SIMBAD. Accessed on line September 24, 2008.
- ↑ BD+19 279C -- Star in double system, database entry, SIMBAD. Accessed on line September 24, 2008.
External links
- SolStation article on 107 Piscium.
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