Delta Sculptoris

Delta Sculptoris (δ Scl, δ Sculptoris) is a triple star system^[7] in the constellation Sculptor. It is approximately 137.4 light years from Earth.^[1]

δ Sculptoris

Location of δ Sculptoris (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Sculptor
Right ascension	23h 48m 55.54658s[1]
Declination	−28° 07′ 48.9745″[1]
Apparent magnitude (V)	4.57[2]
Characteristics
Spectral type	A0Vp(Lam Boo)n[3]
U−B color index	−0.03[2]
B−V color index	+0.01[2]
Astrometry
Radial velocity (Rv)	+8.70[4] km/s
Proper motion (μ)	RA: +100.80[1] mas/yr Dec.: −105.34[1] mas/yr
Parallax (π)	23.73±0.22 mas[1]
Distance	137 ± 1 ly (42.1 ± 0.4 pc)
Absolute magnitude (MV)	1.27+0.11 −0.12
Details[5]
Mass	2.19+0.09 −0.13 M☉
Radius	1.85[a] R☉
Luminosity	30.09+3.46 −3.00 L☉
Surface gravity (log g)	4.22±0.04 cgs
Temperature	9,930±199 K
Metallicity [Fe/H]	−0.14+0.11 −0.18 dex
Rotational velocity (v sin i)	299[6] km/s
Other designations
ADS 17021, CCDM J23489-2808AB, CD−28°18353, FK5 896, GC 33050, GSC 06988-01337, HD 223340/223352, HIP 117452, HR 9016, SAO 192167, WDS J23489-2808AB
Database references
SIMBAD	data

The primary component, Delta Sculptoris A, is a white A-type main-sequence^[3] and Lambda Boötis star^[5] with an apparent magnitude of +4.59. It has a faint, magnitude 11.6 companion, Delta Sculptoris B, 4 arcseconds, or more than 175 astronomical units, away from it. Orbiting this pair at the much greater separation of 74 arcseconds, is the G-type Delta Sculptoris C, which has an apparent magnitude of +9.4.^[7][8]

This system is a candidate member of the AB Doradus moving group, an association of stars with similar ages that share a common heading through space.^[9]

Notes

1. Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:$${\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{9,930}}{\biggr )}^{4}\cdot 30.09}}=1.85\ R_{\odot }.}$$