Lambda2 Sculptoris

For other star systems with this Bayer designation, see λ Sculptoris.

Lambda² Sculptoris is an orange-hued star in the southern constellation of Sculptor. On dark nights it is faintly visible to the naked eye, having an apparent visual magnitude of +5.90.^[2] Based upon an annual parallax shift of 9.63 mas as measured from Earth, it is located at a distance of 331 light-years.^[1] It has a relatively large proper motion, advancing 0.273 arcsecond per year across the sky.^[1]

Lambda² Sculptoris

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Sculptor
Right ascension	00h 44m 12.09903s[1]
Declination	−38° 25′ 18.0542″[1]
Apparent magnitude (V)	+5.90[2]
Characteristics
Evolutionary stage	Horizontal branch[3]
Spectral type	K1 III[4]
B−V color index	+1.15[2]
Astrometry
Radial velocity (Rv)	+28.22±0.13[1] km/s
Proper motion (μ)	RA: +245.567 mas/yr[1] Dec.: +119.038 mas/yr[1]
Parallax (π)	9.8530±0.0458 mas[1]
Distance	331 ± 2 ly (101.5 ± 0.5 pc)
Absolute magnitude (MV)	+0.82[5]
Details[6]
Mass	1.26±0.09 or 1.12±0.06[3] M☉
Radius	12.01±0.14 R☉
Luminosity	56.7±1.4 L☉
Surface gravity (log g)	2.34±0.10 cgs
Temperature	4,572±35 K
Metallicity [Fe/H]	+0.01±0.08 dex
Age	4.64±1.01 or 6.50±1.22[3] Gyr
Other designations
λ2 Scl, CD−39°181, FK5 26, HD 4211, HIP 3456, HR 195, SAO 192703[7]
Database references
SIMBAD	data

The spectrum of this star matches a spectral class of K1III,^[4] with the luminosity class III indicating it is a giant star that has exhausted the hydrogen at its core. It is now fusing helium, being in the evolutionary stage known as the horizontal branch.^[3] Estimates of its mass and age give two different values: 1.12 or 1.26 solar masses and 4.64 or 6.50 billion years.^[3] It has expanded to 12.01 times the Sun's radius and radiates 56.7 times the solar luminosity from its photosphere at an effective temperature of 4,572 K.^[6]