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Solitary orange-hued star in the constellation Sculptor From Wikipedia, the free encyclopedia
Gamma Sculptoris, Latinized from γ Sculptoris, is a single,[11] orange-hued star in the constellation Sculptor. Based upon an annual parallax shift of 17.90 mas as seen from Earth,[1] this star is located about 182 light years from the Sun. It is bright enough to be visible to the naked eye with an apparent visual magnitude of 4.41.[2] It is moving away from the Sun with a radial velocity of +15.6 km/s.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Sculptor |
Right ascension | 23h 18m 49.44076s[1] |
Declination | −32° 31′ 55.2890″[1] |
Apparent magnitude (V) | 4.41[2] |
Characteristics | |
Spectral type | K1 III[3] |
U−B color index | +1.06[4] |
B−V color index | +1.13[4] |
Astrometry | |
Radial velocity (Rv) | +15.60[5] km/s |
Proper motion (μ) | RA: +20.13[1] mas/yr Dec.: −77.72[1] mas/yr |
Parallax (π) | 17.90 ± 0.19 mas[1] |
Distance | 182 ± 2 ly (55.9 ± 0.6 pc) |
Absolute magnitude (MV) | 0.67[2] |
Details | |
Mass | 1.60[6] M☉ |
Radius | 12[7] R☉ |
Luminosity | 72.41[2] L☉ |
Surface gravity (log g) | 2.45[6] cgs |
Temperature | 4,578±24[8] K |
Metallicity [Fe/H] | −0.06[6] dex |
Rotational velocity (v sin i) | 1.7[9] km/s |
Age | 2.47[8] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K1 III.[3] At the age of 2.47[8] billion years it is a red clump star on the horizontal branch,[6] which means it is generating energy through helium fusion at its core. The star has 1.60[6] times the mass of the Sun and it has expanded to 12[7] times the Sun's radius. It is radiating 72[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,578 K[8]
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