Pi2 Octantis

Pi² Octantis, Latinized from π² Octantis, is a solitary^[11] star situated in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.64, allowing it to be faintly visible to the naked eye under ideal conditions. Located 1,570 light years away,^[1] the star is approaching the Sun with a heliocentric radial velocity of −13.8 km/s.^[5]

For other stars with this Bayer designation, see π Octantis.

π² Octantis

Location of π2 Octantis (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Octans
Right ascension	15h 04m 46.9232s[1]
Declination	−83° 02′ 17.920″[1]
Apparent magnitude (V)	5.64 ± 0.01[2]
Characteristics
Spectral type	G8 Ib[3]
U−B color index	+1.15[4]
B−V color index	+1.3[4]
Astrometry
Radial velocity (Rv)	−13.8 ± 0.3[5] km/s
Proper motion (μ)	RA: −8.312[1] mas/yr Dec.: −17.597[1] mas/yr
Parallax (π)	2.0741±0.0429 mas[1]
Distance	1,570 ± 30 ly (482 ± 10 pc)
Absolute magnitude (MV)	−3.19[6]
Details
Mass	7 ± 1[7] M☉
Radius	69.02+1.61 −1.53[8] R☉
Luminosity	2,709[9] L☉
Temperature	4,588[9] K
Rotational velocity (v sin i)	5.7 ± 1.8[10] km/s
Age	43 ± 3[7] Myr
Other designations
π2 Oct, 22 G. Octantis, CPD−82°636, GC 20145, HD 131246, HIP 73771, HR 5545, SAO 258714
Database references
SIMBAD	data

This object is an ageing late G-type supergiant that has 7 times the mass of the Sun^[7] and 69.02 times the radius of the Sun.^[8] It radiates at 2,709 L_☉ from its enlarged photosphere at an effective temperature of 4,588 K,^[9] giving it an orange-yellow glow. Despite its advanced state, Pi² Octantis is still a young star at an age of 43 million years.^[7] It spins modestly with a projected rotational velocity of 5.7 km/s.^[10]