Psi Octantis

ψ Octantis
Location of ψ Oct (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 22h 17m 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]
Distance126.6 ± 0.2 ly
(38.82 ± 0.08 pc)
Absolute magnitude (MV)+2.56[7]
Details
Mass1.49±0.07[8] M☉
Radius1.74±0.04[8] R☉
Luminosity7.82[7] L☉
Surface gravity (log g)4.13±0.05[8] cgs
Temperature7,244[8] K
Metallicity [Fe/H]−0.04[9] dex
Age1.41[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
SIMBADdata

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 velocity of 17 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]

  1. ^ a b c d e f g Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference gray2006 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Hoffleit1953 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference A.P1999 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggelton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Abt1995 was invoked but never defined (see the help page).