Delta Octantis
Star in the constellation Octans
From Wikipedia, the free encyclopedia
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]
 | |
| 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]
