Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sculptor |
Right ascension | 01h 26m 58.09462s [1] |
Declination | −32° 32′ 35.4377″ [1] |
Apparent magnitude (V) | +5.72 [2] |
Characteristics | |
Spectral type | C6,5ea(Np) [3] |
U−B color index | +7.67 [2] |
B−V color index | +3.87 [2] |
Variable type | SRb [4] |
Astrometry | |
Radial velocity (Rv) | −5.40 [5] km/s |
Proper motion (μ) |
RA: −9.784
[1]
mas/
yr Dec.: −30.900 [1] mas/ yr |
Parallax (π) | 2.2724 ± 0.1471 mas [1] |
Distance | 1,440 ± 90
ly (440 ± 30 pc) |
Absolute magnitude (MV) | −0.45 [6] |
Details [7] | |
Mass | 1.3±0.7 M☉ |
Radius | 138.61+1.24 −0.16 [1] R☉ |
Luminosity | 2,068±171 [1] L☉ |
Surface gravity (log g) | −0.6±0.4 cgs |
Temperature | 3,306+2 −15 [1] K |
Metallicity [Fe/H] | 0.0 [3] dex |
Other designations | |
Database references | |
SIMBAD | data |
R Sculptoris is a variable star system in the southern constellation of Sculptor. [9] [10] Parallax measurements provide a distance estimate of approximately 1,435 ± 98 light-years from the Sun. [1] An independent estimate based on measurements of an ejected shell surrounding the star yield a distance of 1,180 ± 140 light-years. [11] The star is drifting closer with a radial velocity of −5.4 km/s. [5]
This is an aging giant star on the asymptotic giant branch with a stellar classification of C6,5ea(Np), [3] which indicates a carbon-rich atmosphere. It is a semi-regular pulsating star of the SRb [4] type that is nearing the end of its fusing lifespan. A sine curve fitted to the last ten pulsation cycles prior to 2017 give a pulsation period of 376 days with an amplitude of 0.75 magnitude. The star is shedding its outer atmosphere, and it is surrounded by a thin shell of dust and gas that was created during the most recent thermal pulse around 2,000 years ago. [11]
Observations have revealed a spiral structure in the material around the star. [13] The spiral is suspected to be caused by an unseen companion star. [9] The spiral windings are consistent with an orbital period of ~350 years. [13]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sculptor |
Right ascension | 01h 26m 58.09462s [1] |
Declination | −32° 32′ 35.4377″ [1] |
Apparent magnitude (V) | +5.72 [2] |
Characteristics | |
Spectral type | C6,5ea(Np) [3] |
U−B color index | +7.67 [2] |
B−V color index | +3.87 [2] |
Variable type | SRb [4] |
Astrometry | |
Radial velocity (Rv) | −5.40 [5] km/s |
Proper motion (μ) |
RA: −9.784
[1]
mas/
yr Dec.: −30.900 [1] mas/ yr |
Parallax (π) | 2.2724 ± 0.1471 mas [1] |
Distance | 1,440 ± 90
ly (440 ± 30 pc) |
Absolute magnitude (MV) | −0.45 [6] |
Details [7] | |
Mass | 1.3±0.7 M☉ |
Radius | 138.61+1.24 −0.16 [1] R☉ |
Luminosity | 2,068±171 [1] L☉ |
Surface gravity (log g) | −0.6±0.4 cgs |
Temperature | 3,306+2 −15 [1] K |
Metallicity [Fe/H] | 0.0 [3] dex |
Other designations | |
Database references | |
SIMBAD | data |
R Sculptoris is a variable star system in the southern constellation of Sculptor. [9] [10] Parallax measurements provide a distance estimate of approximately 1,435 ± 98 light-years from the Sun. [1] An independent estimate based on measurements of an ejected shell surrounding the star yield a distance of 1,180 ± 140 light-years. [11] The star is drifting closer with a radial velocity of −5.4 km/s. [5]
This is an aging giant star on the asymptotic giant branch with a stellar classification of C6,5ea(Np), [3] which indicates a carbon-rich atmosphere. It is a semi-regular pulsating star of the SRb [4] type that is nearing the end of its fusing lifespan. A sine curve fitted to the last ten pulsation cycles prior to 2017 give a pulsation period of 376 days with an amplitude of 0.75 magnitude. The star is shedding its outer atmosphere, and it is surrounded by a thin shell of dust and gas that was created during the most recent thermal pulse around 2,000 years ago. [11]
Observations have revealed a spiral structure in the material around the star. [13] The spiral is suspected to be caused by an unseen companion star. [9] The spiral windings are consistent with an orbital period of ~350 years. [13]