Pi1 Octantis

For other stars with this Bayer designation, see π Octantis.
π1 Octantis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 15h 01m 50.7983s[1]
Declination −83° 13′ 39.5303″[1]
Apparent magnitude (V) 5.64±0.01[2]
Characteristics
Spectral type G8/K0 III[3]
U−B color index +0.74[4]
B−V color index +0.95[4]
Astrometry
Radial velocity (Rv)13.6±0.4[5] km/s
Proper motion (μ) RA: +18.954 mas/yr[1]
Dec.: +52.520 mas/yr[1]
Parallax (π)8.419 ± 0.0349 mas[1]
Distance387 ± 2 ly
(118.8 ± 0.5 pc)
Absolute magnitude (MV)+0.24[6]
Details[7]
Mass2.74±0.15 M☉
Radius11.62±0.21 R☉
Luminosity76.2±1.7 L☉
Surface gravity (log g)2.7±0.1 cgs
Temperature5,002±36 K
Metallicity [Fe/H]−0.01±0.03 dex
Rotational velocity (v sin i)<1[8] km/s
Other designations
π1 Oct, 21 G. Octantis, CPD−82°629, FK5 3987, GC 20070, HD 130650, HIP 73540, HR 5525, SAO 258713[9][10]
Database references
SIMBADdata

Pi1 Octantis (Pi1 Oct), Latinized π1 Octantis, is a solitary[11] star in the southern circumpolar constellation Octans. It is faintly visible to the naked eye with an apparent magnitude 5.64, and is estimated to be 387 light years away. However, it is receding with a heliocentric radial velocity of 14 km/s.[5]

Pi1 Oct has a stellar classification of G8/K0 III[3] — intermediate between a G8 and K0 giant star. It has 2.74 times the mass of the Sun and an effective temperature of 5,002 k,[7] giving a yellow hue. However, an enlarged radius of 11.62 R☉ yields a luminosity 76 times that of the Sun.[7] Pi1 Oct has a metallicity[7] around solar level and spins with a projected rotational velocity lower than 1 km/s.[8]

  1. ^ a b c d Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD 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 Eggleton2008 was invoked but never defined (see the help page).