| 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−Bcolor index | +1.12[5] |
| B−Vcolor 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 |
7 Piscium is a single[10]star in thezodiacconstellation ofPisces,[9] located around 343 light-years away from theSun.[1] It has theBayer designationb Piscium;7 Piscium is theFlamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with anapparent visual magnitude of 5.07.[2] It is moving further from the Earth with a heliocentricradial velocity of 40 km/s.[1]
This is ametal-deficientgiant star[11] with astellar classification of K1 IV.[4] It is ared clump giant, which indicates it is on thehorizontal 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 themass of the Sun.[8] It has 22[1] times theSun's radius and is radiating 163[1] times theSun's luminosity from its enlargedphotosphere at aneffective temperature of4,314 K.[7]
