Delta Octantis

δ Octantis, Latinised as Delta Octantis, has the distinction of being Saturn's southern pole star.^[8] An orange giant of class K2III,^[3] it has 1.2 times the mass of the Sun and about 25 times the Sun's radius. This star is about 4.3 billion years old, which is similar to the age of the Sun.^[6]

δ Octantis

Location of δ Octantis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Octans
Right ascension	14h 26m 55.23244s[1]
Declination	−83° 40′ 04.3868″[1]
Apparent magnitude (V)	4.31[2]
Characteristics
Spectral type	K2III[3]
U−B color index	+1.45[4]
B−V color index	+1.31[4]
Astrometry
Radial velocity (Rv)	+4.60[5] km/s
Proper motion (μ)	RA: -96.12[1] mas/yr Dec.: -13.27[1] mas/yr
Parallax (π)	10.91±0.14 mas[1]
Distance	299 ± 4 ly (92 ± 1 pc)
Absolute magnitude (MV)	−0.35 ± 0.09[6]
Details
Mass	1.06[5] M☉
Radius	24.61[5] R☉
Luminosity	271[2] L☉
Surface gravity (log g)	1.89[5] cgs
Temperature	4,311[5] K
Metallicity [Fe/H]	-0.42[5] dex
Rotational velocity (v sin i)	1.1[7] km/s
Other designations
CD-83 189, GC 19349, HIP 70638, HR 5339, HD 124882, NSV 6636, SAO 258698
Database references
SIMBAD	data

Naming

In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, 異雀 (Yì Què), meaning Exotic Bird, refers to an asterism consisting of δ Octantis, ζ Apodis, ι Apodis, β Apodis, γ Apodis, δ¹ Apodis, η Apodis, α Apodis and ε Apodis. Consequently, δ Octantis itself is known as 異雀五 (Yì Què wǔ, English: the Fifth Star of Exotic Bird).^[9]