Eta Octantis

η Octantis
Location of η Octantis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Octans
Right ascension 10h 59m 13.7578s[1]
Declination −84° 35′ 38.0177″[1]
Apparent magnitude (V) 6.18±0.01[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A1 Va[4]
U−B color index +0.12[5]
B−V color index +0.11[5]
Astrometry
Radial velocity (Rv)−1.7±0.6[6] km/s
Proper motion (μ) RA: −65.747 mas/yr[1]
Dec.: −8.273 mas/yr[1]
Parallax (π)9.1133 ± 0.02 mas[1]
Distance357.9 ± 0.8 ly
(109.7 ± 0.2 pc)
Absolute magnitude (MV)+1.08[7]
Details
Mass2.37±0.03[3] M☉
Radius2.6±0.1[8] R☉
Luminosity45.3+3.1
−3.0[3] L☉
Surface gravity (log g)4.1[9] cgs
Temperature9,500[9] K
Metallicity [Fe/H]−0.01[10] dex
Rotational velocity (v sin i)152±13[11] km/s
Age547[10] Myr
Other designations
η Oct, 11 G. Octantis[12], CPD−83°386, FK5 1664, GC 15164, HD 96124, HIP 53702, HR 4312, SAO 258600[13]
Database references
SIMBADdata

Eta Octantis, Latinized from η Octantis, is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.19,[2] making it faintly visible to the naked eye. The object is situated at a distance of 358 light years[1] but is approaching the Solar System with a heliocentric radial velocity of −1.7 km/s.[6]

Eta Octantis has a stellar classification of A1 Va,[4] indicating that it is an ordinary A-type main sequence star. At present it has 2.37 times the Sun's mass[3] and 2.6 times the Sun's radius.[8] It shines with a luminosity of 45 L☉[3] from its photosphere at an effective temperature of 9,500 K, giving a white hue.[9] Eta Octantis is a rapidly rotating star, with a projected rotational velocity of 152 km/s,[11] and is estimated to be 547 million years old,[10] having completed 72% of its main sequence lifetime.[3]

  1. ^ a b c d e Cite error: The named reference EDR3 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. ^ a b c d e f Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Paunzen2001 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. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Lafrasse2010 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Reiners2004 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).