Pi6 Orionis
Star in the constellation Orion
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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.[5]
 | |
| 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 | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | K0/1 III[4] |
| U−B color index | +1.506[2] |
| B−V color index | +1.390[2] |
| Astrometry | |
| Radial velocity (Rv) | +15.36±0.24[5] 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] |
| Distance | 950 ± 80 ly (290 ± 30 pc) |
| Absolute magnitude (MV) | −2.86[6] |
| Details[3] | |
| Mass | 4.15±0.68 M☉ |
| Radius | 87.73±9.79 R☉ |
| Luminosity | 2,185.6±418.7 L☉ |
| Surface gravity (log g) | 1.20±0.15 cgs |
| Temperature | 4,217±121 K |
| Metallicity [Fe/H] | −0.23±0.10 dex |
| Rotational velocity (v sin i) | 8[7] km/s |
| Age | 230±11 Myr |
| Other designations | |
| π6 Ori, 10 Orionis, BD+01°872, HD 31767, HIP 23123, HR 1601, SAO 112281[8] | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star on the horizontal branch,[3] with a stellar classification of K0/1 III.[4] 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.[3]