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Star in the constellation Perseus From Wikipedia, the free encyclopedia
3 Persei is a single,[7] orange-hued star in the northern constellation of Perseus. It is dimly visible to the naked eye under good viewing conditions, having an apparent visual magnitude of 5.70[2] The star is located around 79 parsecs (257 ly) distant, based upon an annual parallax shift of 12.7 mas.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 01h 58m 33.50596s[1] |
Declination | +49° 12′ 15.6705″[1] |
Apparent magnitude (V) | 5.70[2] |
Characteristics | |
Spectral type | K0 IV[3] |
Astrometry | |
Radial velocity (Rv) | −0.67±0.17[4] km/s |
Proper motion (μ) | RA: +7.051[1] mas/yr Dec.: +41.686[1] mas/yr |
Parallax (π) | 12.6940 ± 0.0671 mas[1] |
Distance | 257 ± 1 ly (78.8 ± 0.4 pc) |
Absolute magnitude (MV) | 1.33[2] |
Details[5] | |
Mass | 1.41±0.17 M☉ |
Radius | 8.27±0.55 R☉ |
Luminosity | 37.2+7.5 −6.3 L☉ |
Surface gravity (log g) | 2.72±0.09 cgs |
Temperature | 4,757±25 K |
Metallicity [Fe/H] | −0.15±0.05 dex |
Rotational velocity (v sin i) | 1.85±0.45 km/s |
Age | 2.91±0.98 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This star has a stellar classification of K0 IV,[3] suggesting it is a K-type subgiant – an evolved star that has used up its core hydrogen and is evolving to become a red giant. However, da Silva et al. (2015) categorized it as a giant star proper.[8] At the age of around three billion years, it has an estimated 1.4 times the mass of the Sun and has expanded to move than 8 times the Sun's radius. It is radiating roughly 37 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,757 K.[5]
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