| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 22h17m 50.5954s[1] |
| Declination | −77° 30′ 41.599″[1] |
| Apparent magnitude (V) | 5.47±0.01[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | F0IIp[3] (F4V:kA5)[4] |
| U−B color index | +0.12[5] |
| B−V color index | +0.31[5] |
| Astrometry | |
| Radial velocity (Rv) | 17.0±1.6[6] km/s |
| Proper motion (μ) | RA: −37.392 mas/yr[1] Dec.: +13.788 mas/yr[1] |
| Parallax (π) | 25.7575 ± 0.0505 mas[1] |
| Distance | 126.6 ± 0.2 ly (38.82 ± 0.08 pc) |
| Absolute magnitude (MV) | +2.56[7] |
| Details | |
| Mass | 1.49±0.07[8] M☉ |
| Radius | 1.74±0.04[8] R☉ |
| Luminosity | 7.82[7] L☉ |
| Surface gravity (log g) | 4.13±0.05[8] cgs |
| Temperature | 7,244[8] K |
| Metallicity [Fe/H] | −0.04[9] dex |
| Age | 1.41[9] Gyr |
| Other designations | |
ψ Oct, 60 G. Octantis[10], CPD−78°1442, FK5 3779, GC 31133, HD 210853, HIP 110078, HR 8471, SAO 258020[11] | |
| Database references | |
| SIMBAD | data |
Psi Octantis, Latinized from ψ Octantis, is a solitary[12] star in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.47,[2] allowing it to be seen with the naked eye under ideal conditions. The star is relatively close at a distance of 126 light years[1] but is receding with a heliocentric radial velocityof17 km/s.[6]
Psi Octantis has a spectral classification of F0IIp, suggesting that it is a bright giant but with peculiarities. Other assessments give a luminosity class of III (giant),[13] III-IV (intermediate between giant and subgiant),[14] or V: (approximately main sequence).[4] One paper gives a spectral class of F4V:kA5, indicating that it is a probable F-type main-sequence star with the calcium K-lines of an A5 star, including sharp absorption lines of metals.[4] Analysis of its evolutionary stage show it to be a somewhat evolved main sequence star.[1]
It has 149% the mass of the Sun and 1.74 times the radius of the Sun.[8] It shines at 7.82 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 7,244 K,[8] giving it a yellowish white glow. Psi Octantis has an iron abundance 91% that of the Sun and is estimated to be 1.41 billion years old.[9]
