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Star in the constellation Pisces From Wikipedia, the free encyclopedia
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]
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 mas[1] |
Distance | 24.80 ± 0.03 ly (7.605 ± 0.009 pc) |
Absolute magnitude (MV) | 5.87[8] |
Details[9] | |
Mass | 0.86 M☉ |
Radius | 0.82±0.03 R☉ |
Luminosity (bolometric) | 0.46[8] L☉ |
Surface gravity (log g) | 4.57±0.10 cgs |
Temperature | 5,172±80 K |
Metallicity [Fe/H] | −0.01±0.07 dex |
Rotation | 35.0 days[10] |
Rotational velocity (v sin i) | 2.0±1.0 km/s |
Age | 6.3[11] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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]
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