Sigma Sculptoris, Latinized from σ Sculptoris, is a solitary,[12] white-hued star in the southern constellation of Sculptor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.54.[2] Based upon an annual parallax shift of 14.04 mas as seen from Earth,[1] it is located about 232 light years from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Sculptor |
Right ascension | 01h 02m 26.43280s[1] |
Declination | −31° 33′ 07.2237″[1] |
Apparent magnitude (V) | +5.54[2] |
Characteristics | |
Spectral type | A1/A2 IV[3] |
U−B color index | +0.13[2] |
B−V color index | +0.06[2] |
Variable type | α2 CVn[4] |
Astrometry | |
Radial velocity (Rv) | −15.40±0.50[5] km/s |
Proper motion (μ) | RA: +80.50[1] mas/yr Dec.: +14.64[1] mas/yr |
Parallax (π) | 14.04 ± 0.32 mas[1] |
Distance | 232 ± 5 ly (71 ± 2 pc) |
Absolute magnitude (MV) | +1.24[6] |
Details | |
Mass | 2.07[7] M☉ |
Radius | 2.2[8] R☉ |
Luminosity | 25.7[9] L☉ |
Surface gravity (log g) | 4.02±0.14[7] cgs |
Temperature | 9,005±306[7] K |
Rotational velocity (v sin i) | 82.1±1.2[10] km/s |
Age | 464[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an A-type subgiant with a stellar classification of A1/A2 IV.[3] It is a suspected Ap star and is classified as an Alpha2 Canum Venaticorum variable[4] with a periodicity of 2.37 days.[13] The star has an estimated 2.07[7] the mass of the Sun and around 2.2[8] times the Sun's radius. It is spinning with a projected rotational velocity of 82 km/s[10] and is about 464 million years old.[7] Sigma Sculptoris radiates 25.7[9] times the solar luminosity from its photosphere at an effective temperature of 9005 K.[7]