Kappa1 Sculptoris

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

Kappa¹ Sculptoris is a binary star^[2] system in the southern constellation of Sculptor. It is faintly visible to the naked eye, with a combined apparent visual magnitude of +5.51.^[2] Based upon an annual parallax shift of 12.91 mas as measured from Earth,^[1] it is located roughly 250 light years from the Sun.

Kappa¹ Sculptoris

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Sculptor
Right ascension	00h 09m 21.06696s[1]
Declination	−27° 59′ 16.5322″[1]
Apparent magnitude (V)	+5.51 (6.23 + 6.29)[2]
Characteristics
Spectral type	F2V[3] (F4 III + F3 III)[2]
U−B color index	+0.06[4]
B−V color index	+0.42[4]
Astrometry
Radial velocity (Rv)	7.7±1.6[5] km/s
Proper motion (μ)	RA: +70.11[1] mas/yr Dec.: −8.97[1] mas/yr
Parallax (π)	12.91±0.72 mas[1]
Distance	250 ± 10 ly (77 ± 4 pc)
Absolute magnitude (MV)	2.05[6]
Orbit[7]
Period (P)	616.04 yr
Semi-major axis (a)	1.500″
Eccentricity (e)	0.103
Inclination (i)	98.98°
Longitude of the node (Ω)	81.75°
Periastron epoch (T)	2095.68
Argument of periastron (ω) (secondary)	256.86°
Details
κ1 Scl A
Mass	1.8[8] M☉
Temperature	6,565[9] K
Rotational velocity (v sin i)	116.8±5.8[6] km/s
B
Mass	1.8[10] M☉
Radius	2.3[10] R☉
Luminosity	12.2[10] L☉
Temperature	7,111[10] K
Other designations
κ1 Scl, CD−28°16, HD 493, HIP 761, HR 24, SAO 166083, ADS 111, WDS J00094-2759AB[11]
Database references
SIMBAD	data
	A
	B

The pair orbit each other with an estimated period of 616 years, a semimajor axis of 1.5 arc seconds, and an eccentricity of 0.1.^[7] Both components are evolved, yellow-white hued, F-type giant stars. The primary, component A, has a visual magnitude of 6.23^[2] and a stellar classification of F4 III.^[2] The companion, component B, is magnitude 6.29^[2] and of class F3 III.^[2] Their composite spectrum is classified as F2V.^[3] The mass ratio is 0.782, meaning the secondary is only 78.2% as massive as the primary.^[12] An 18th magnitude companion star lies 73.4 arc seconds distant along a position angle of 243°, as of 1998.^[13]