Pi6 Orionis

For other stars with this Bayer designation, see Pi Orionis.
Pi6 Orionis
Location of π6 Orionis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Orion
Right ascension 04h 58m 32.90210s[1]
Declination +01° 42′ 50.4582″[1]
Apparent magnitude (V) 4.469[2]
Characteristics
Spectral type K0/1 III[3]
U−B color index +1.506[2]
B−V color index +1.390[2]
Astrometry
Radial velocity (Rv)+15.36±0.24[4] km/s
Proper motion (μ) RA: −1.30[1] mas/yr
Dec.: −7.67[1] mas/yr
Parallax (π)3.45 ± 0.30 mas[1]
Distance950 ± 80 ly
(290 ± 30 pc)
Absolute magnitude (MV)−2.86[5]
Details[6]
Mass4.15±0.68 M☉
Radius87.73±9.79 R☉
Luminosity2,185.6±418.7 L☉
Surface gravity (log g)1.20±0.15 cgs
Temperature4,217±121 K
Metallicity [Fe/H]−0.23±0.10 dex
Rotational velocity (v sin i)8[7] km/s
Age230±11 Myr
Other designations
π6 Ori, 10 Orionis, BD+01°872, HD 31767, HIP 23123, HR 1601, SAO 112281[8]
Database references
SIMBADdata

Pi6 Orionis (π6 Ori, π6 Orionis) is a solitary[9] star in the eastern part of the constellation Orion. It is visible to the naked eye with an apparent visual magnitude of 4.469.[2] Based upon an annual parallax shift of 3.45 mas,[1] it is around 950 light-years from the Sun. At that distance, the visual magnitude of the star is reduced by an interstellar absorption factor of 0.52.[4]

This is an evolved K-type giant star on the horizontal branch,[6] with a stellar classification of K0/1 III.[3] It is a suspected variable star with a measured variation between 4.45 and 4.49 in visual magnitude.[10] Pi6 Orionis has over four times the mass of the Sun and has expanded to around 88 times the Sun's radius. Over the course of its life span, the star has shed around 0.04±0.01 solar mass. With an effective temperature of 4,217 K in its outer atmosphere it is radiating roughly 2,200 times the solar luminosity.[6]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Cousins1984 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference famaey2005 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Cardini2005 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Reffert2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Bernacca1970 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference csvs was invoked but never defined (see the help page).