101 Piscium
Blue giant star in the constellation Pisces
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101 Piscium is a star in the zodiac constellation of Pisces,[9] located around 1,400 light years away from the Sun. This appears as a dim, blue-white hued star near the lower limit of visibility to the naked eye at an apparent visual magnitude of 6.23.[2] It is a suspected variable star with the designation NSV 559;[10] 101 Piscium is the Flamsteed designation. The star is moving closer to the Earth with a heliocentric radial velocity of −10 km/s.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 35m 46.44226s[1] |
| Declination | +14° 39′ 41.1144″[1] |
| Apparent magnitude (V) | 6.23[2] |
| Characteristics | |
| Spectral type | B9.5 III[3] |
| U−B color index | −0.151[4] |
| B−V color index | −0.036±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.10[5] km/s |
| Proper motion (μ) | RA: +3.287[1] mas/yr Dec.: −8.052[1] mas/yr |
| Parallax (π) | 2.3343±0.0663 mas[1] |
| Distance | 1,400 ± 40 ly (430 ± 10 pc) |
| Absolute magnitude (MV) | −2.07[2] |
| Details | |
| Mass | 4.53±0.51[6] M☉ |
| Radius | 3.6[7] R☉ |
| Luminosity | 1,037+523 −347[6] L☉ |
| Surface gravity (log g) | 2.907±0.028[8] cgs |
| Temperature | 10,471+49 −48[6] K |
| Rotational velocity (v sin i) | 246[6] km/s |
| Other designations | |
| 101 Psc, NSV 559, BD+13° 240, GC 1929, HD 9766, HIP 7436, HR 455, SAO 92530[9] | |
| Database references | |
| SIMBAD | data |
This object has a stellar classification of B9.5 III,[3] matching a giant star that has consumed the hydrogen at its core and is evolving away from the main sequence.[6] It is spinning rapidly with a projected rotational velocity of 246[6] km/s, compared to a critical velocity of 270 km/s.[8] The star has 4.5[6] times the mass of the Sun and about 3.6[7] times the Sun's radius. It is radiating around 1,000[6] times the luminosity of the Sun from its photosphere at an effective temperature of 10,471 K.[6]