Kappa Octantis

Kappa Octantis, Latinized from κ Octantis, is a solitary^[9] star in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.55,^[2] making it visible to the naked eye under ideal conditions. The object is located at a distance of 285 light years but is approaching the Solar System with a heliocentric radial velocity of −9 km/s.^[5]

κ Octantis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Octans
Right ascension	13h 40m 55.4833s[1]
Declination	−85° 47′ 09.752″[1]
Apparent magnitude (V)	5.55±0.01[2]
Characteristics
Spectral type	A2 mA5-A8[3]
U−B color index	+0.16[4]
B−V color index	+0.18[4]
Astrometry
Radial velocity (Rv)	−9.0±7.4[5] km/s
Proper motion (μ)	RA: −88.395 mas/yr[1] Dec.: −23.285 mas/yr[1]
Parallax (π)	11.4403±0.0849 mas[1]
Distance	285 ± 2 ly (87.4 ± 0.6 pc)
Absolute magnitude (MV)	+0.95[6]
Details
Mass	2.07±0.18[7] M☉
Radius	2.75+0.13 −0.12[7] R☉
Luminosity	34.83[6] L☉
Surface gravity (log g)	3.9±0.1[7] cgs
Temperature	7,943+185 −181[7] K
Age	354[8] Myr
Other designations
κ Oct, 18 G. Octantis, CPD−85°384, GC 18357, HD 117374, HIP 66753, HR 5084, SAO 258674
Database references
SIMBAD	data

Kappa Octanits is an Am star, making it difficult to classify. It has been given a stellar classification of A2 mA5-A8,^[3] indicating that it is an A2 star with the metallic lines of an A5-A8 star. At present it has 2.07 times the mass of the Sun and 2.75 its radius.^[7] It shines at a luminosity of about 35 L_☉^[6] from its photosphere at an effective temperature of 7,943 K,^[7] giving it a white glow. Kappa Octantis is said to be around 350 million years old.^[8]