Mu1 Octantis

Mu¹ Octantis, Latinized from μ¹ Octantis, is a solitary star in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.98,^[2] allowing it to be faintly visible to the naked eye under ideal conditions. Located 335 light years away,^[1] it is approaching the Sun with a heliocentric radial velocity of −36 km/s.^[5]

For other stars with this Bayer designation, see μ Octantis.

μ¹ Octantis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Octans
Right ascension	20h 42m 02.9873s[1]
Declination	−76° 10′ 50.131″[1]
Apparent magnitude (V)	5.98 ± 0.01[2]
Characteristics
Spectral type	F6 II/III[3]
U−B color index	+0.11[4]
B−V color index	+0.44[4]
Astrometry
Radial velocity (Rv)	−36 ± 4[5] km/s
Proper motion (μ)	RA: +190.891[1] mas/yr Dec.: −9.479[1] mas/yr
Parallax (π)	9.7399±0.0241 mas[1]
Distance	334.9 ± 0.8 ly (102.7 ± 0.3 pc)
Absolute magnitude (MV)	+0.97[6]
Details
Mass	1.36+0.26 −0.19[7] M☉
Radius	4.68+0.15 −0.32[7] R☉
Luminosity	34.3[8] L☉
Surface gravity (log g)	3.23+0.11 −0.07[7] cgs
Temperature	6,521[8] K
Metallicity [Fe/H]	+0.19[9] dex
Age	900[9] Myr
Other designations
μ1 Oct, 50 G. Octantis, CD−76°1054, CPD−76°1434, GC 28731, HD 196051, HIP 102162, HR 7863, SAO 257838, LTT 8161
Database references
SIMBAD	data

This object is an F-type star with the blended luminosity class of a giant star and a bright giant.^[3] At present it has 1.36 times the mass of the Sun^[7] but has expanded to 4.68 times its girth.^[7] It radiates at 34.3 L_☉ from its enlarged photosphere at an effective temperature of 6,521 K,^[8] giving it a yellow white glow. Mu¹ Octantis is metal enriched and has an age of 900 million years.^[9]