7 Piscium
Star in the constellation Pisces
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7 Piscium is a single[10] star in the zodiac constellation of Pisces,[9] located around 343 light-years away from the Sun.[1] It has the Bayer designation b Piscium; 7 Piscium is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.07.[2] It is moving further from the Earth with a heliocentric radial velocity of 40 km/s.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 23h 20m 20.58306s[1] |
| Declination | +05° 22′ 52.7000″[1] |
| Apparent magnitude (V) | 5.069[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K1 IV[4] |
| U−B color index | +1.12[5] |
| B−V color index | +1.204±0.002[6] |
| Astrometry | |
| Radial velocity (Rv) | 40.46±0.18[1] km/s |
| Proper motion (μ) | RA: 78.829[1] mas/yr Dec.: −59.228[1] mas/yr |
| Parallax (π) | 9.5042±0.1880 mas[1] |
| Distance | 343 ± 7 ly (105 ± 2 pc) |
| Absolute magnitude (MV) | −0.56[6] |
| Details[7] | |
| Mass | 1.37[8] M☉ |
| Radius | 22.06+1.38 −3.16[1] R☉ |
| Luminosity | 163±4[1] L☉ |
| Surface gravity (log g) | 1.81±0.28 cgs |
| Temperature | 4,314±80 K |
| Metallicity [Fe/H] | −0.71±0.12 dex |
| Age | 4.58[8] Gyr |
| Other designations | |
| b Piscium, 7 Psc, BD+04°4997, FK5 3871, HD 220009, HIP 115227, HR 8878, SAO 128126[9] | |
| Database references | |
| SIMBAD | data |
This is a metal-deficient giant star[11] with a stellar classification of K1 IV.[4] It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through the fusion of helium at its core.[3] The star is 4.58 billion years old with 1.37 times the mass of the Sun.[8] It has 22[1] times the Sun's radius and is radiating 163[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,314 K.[7]