107 Piscium
Star in the constellation Pisces
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107 Piscium is a single[14] 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.[15] 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.[3] However, that finding of variation was not confirmed by subsequent observations and is most likely spurious data.[7] It is located at a distance of about 24.8 light years away from the Sun.[2] 107 Piscium is drifting closer to the Sun with a radial velocity of â33.6,[8] and is predicted to come as close as 15.4 light-years in around 135,800 years.[16]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces[1] |
| Right ascension | 01h 42m 29.76349s[2] |
| Declination | +20° 16â² 06.6602â³[2] |
| Apparent magnitude (V) | 5.14 to 5.26[3] |
| Characteristics | |
| Spectral type | K1V[4] |
| UâB color index | +0.49[5] |
| BâV color index | +0.84[5] |
| VâR color index | 0.5[6] |
| RâI color index | +0.43[5] |
| Variable type | Constant[7] |
| Astrometry | |
| Radial velocity (Rv) | â33.619±0.0013[8] km/s |
| Proper motion (μ) | RA: â301.592[2] mas/yr Dec.: â674.505[2] mas/yr |
| Parallax (Ï) | 131.4903±0.1515 mas[2] |
| Distance | 24.80 ± 0.03 ly (7.605 ± 0.009 pc) |
| Absolute magnitude (MV) | 5.87[9] |
| Details[10] | |
| Mass | 0.86 Mâ |
| Radius | 0.82±0.03 Râ |
| Luminosity (bolometric) | 0.46[9] Lâ |
| Surface gravity (log g) | 4.57±0.10 cgs |
| Temperature | 5,172±80 K |
| Metallicity [Fe/H] | â0.01±0.07 dex |
| Rotation | 35.0 days[11] |
| Rotational velocity (v sin i) | 2.0±1.0 km/s |
| Age | 6.3[12] Gyr |
| Other designations | |
| 107 Psc, 2 Arietis, 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[6][13] | |
| Database references | |
| SIMBAD | data |
This object is a K-type main-sequence star with a stellar classification of K1V,[4] indicating it is generating energy from core hydrogen fusion. It is somewhat older than the Sunâapproximately 6 billion years old.[12] The star has 86% of the mass and 82% of the radius of the Sun,[10] but shines with only 46% of the Sun's luminosity.[9] The effective temperature of the star is 5,172 K.[10] It is rotating slowly with a period of 35.0 d.[11] The abundance of elements other than hydrogen and heliumâthe star's metallicityâis slightly lower than that of the Sun.[17] The level of chromospheric activity is similar to the Sun, and it shows a simple cycle of variation.[18][19]
107 Piscium has been examined for the presence of an infrared excess caused by exozodiacal dust, but none was detected.[20] 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 0.52â1.10 Astronomical Units (AU), where 1 AU is the average distance from the Earth to the Sun.[20]
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 confirmed.[21]