Phi2 Orionis

Phi² Orionis is a star in the constellation Orion, where it forms a small triangle on the celestial sphere with the nearby Meissa and Phi¹ Orionis.^[8] This star is visible to the naked eye with an apparent visual magnitude of 4.081.^[2] Based upon an annual parallax shift of 28.67 mas,^[6] it is located around 114 light-years from the Sun.

For other stars with this Bayer designation, see Phi Orionis.

φ² Orionis

φ2 (circled) in the constellation Orion
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Orion
Right ascension	05h 36m 54.389s[1]
Declination	+09° 17′ 26.42″[1]
Apparent magnitude (V)	4.081[2]
Characteristics
Evolutionary stage	Yellow giant
Spectral type	G8 III-IV[3]
U−B color index	+0.618[2]
B−V color index	+0.966[2]
Astrometry
Radial velocity (Rv)	99.03±0.18[1] km/s
Proper motion (μ)	RA: +98.301 mas/yr[1] Dec.: −305.022 mas/yr[1]
Parallax (π)	28.6722±0.1859 mas[1]
Distance	113.8 ± 0.7 ly (34.9 ± 0.2 pc)[1]
Absolute magnitude (MV)	+1.33±0.07[4]
Details[5]
Mass	1.07±0.04 M☉
Radius	8.22±0.07[6] R☉
Luminosity	29.8±0.4[6] L☉
Surface gravity (log g)	3.00±0.02 cgs
Temperature	4,703±11[6] K
Metallicity [Fe/H]	−0.56±0.02 dex
Rotational velocity (v sin i)	1.91±0.53 km/s
Age	6.91±1.04 Gyr
Other designations
φ2 Ori, 40 Orionis, BD+09°898, HD 37160, HIP 26366, HR 1907, SAO 112958[7]
Database references
SIMBAD	data

Yellow φ² Orionis with nebulosity east of φ¹ Orionis and south-east of λ Orionis

This is an evolved G-type star of stellar classification G8 III-IV,^[3] which means that it is in an evolutionary stage between a subgiant (IV) and a giant star (III). It is estimated to be 6.9 billion years old, has 1.07 times the mass of the Sun,^[5] but has expanded to 8 times the Sun's radius. The star shines with 30 times the solar luminosity from its outer atmosphere at an effective temperature of 4,700 K.^[6]