Pi2 Doradus

Pi² Doradus, Latinized from π² Doradus, is a solitary star^[12] located in the southern constellation Doradus. It is faintly visible to the naked eye as a yellow-hued point of light with an apparent magnitude of 5.38.^[2] The object is located relatively close at a distance of 277 light-years based on Gaia DR3 parallax measurements, but it is receding with a heliocentric radial velocity of approximately 9.1 km/s.^[5] At its current distance, Pi² Doradus' brightness is diminished by 0.27 magnitudes due to interstellar extinction^[13] and it has an absolute magnitude of +0.78.^[6]

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

π² Doradus

Location of π2 Doradus on the map (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Dorado
Right ascension	06h 25m 28.63069s[1]
Declination	−69° 42′ 25.0800″[1]
Apparent magnitude (V)	5.38[2]
Characteristics
Evolutionary stage	horizontal branch[3]
Spectral type	G8 III[4]
U−B color index	+0.67[2]
B−V color index	+0.97[2]
Astrometry
Radial velocity (Rv)	9.1±2.8[5] km/s
Proper motion (μ)	RA: −12.184 mas/yr[1] Dec.: +200.786 mas/yr[1]
Parallax (π)	11.7563±0.058 mas[1]
Distance	277 ± 1 ly (85.1 ± 0.4 pc)
Absolute magnitude (MV)	+0.78[6]
Details[7]
Mass	1.80±0.07 M☉
Radius	9.84±0.16 R☉
Luminosity	51.1±1.1 L☉
Surface gravity (log g)	2.66±0.08 cgs
Temperature	4,919±29 K
Metallicity [Fe/H]	−0.26±0.03 dex
Rotational velocity (v sin i)	<2.0[8] km/s
Age	1.61±0.15[9] Gyr
Other designations
π2 Dor, 42 G. Doradus[10], CD−69°392, CPD−69°614, FK5 2495, GC 8390, HD 46116, HIP 30565, HR 2327, SAO 249550, TIC 167126852[11]
Database references
SIMBAD	data

Pi² Doradus has a stellar classification of G8 III,^[4] indicating that it is an evolved G-type giant star. It is a red clump star that is currently on the horizontal branch—fusing helium at its stellar core.^[3] It has 1.8 times the mass of the Sun^[7] but, at the age of 1.61 billion years,^[9] it has expanded to 9.84 times the radius of the Sun.^[7] It radiates 51.1 times the luminosity of the Sun from its photosphere at an effective temperature of 4,919 K^[7] Pi² Doradus is metal deficient with an iron abundance of [Fe/H] = −0.26 or roughly 55% of the Sun's.^[7] Like many giant stars Pi² Doradus spins slowly, having a projected rotational velocity lower than 2 km/s.^[8]