Pi1 Doradus

Pi¹ Doradus, Latinized from π¹ Doradus, is a solitary star^[15] located in the southern constellation Dorado near the southwestern border with Mensa. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.54.^[2] Gaia DR3 parallax measurements imply a distance of 660 light-years^[1] and it is currently receding with a heliocentric radial velocity of 15.7 km/s.^[5] At its current distance, Pi¹ Doradus' brightness is diminished by 0.24 magnitudes due to interstellar extinction^[16] and it has an absolute magnitude of −0.83.^[6]

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

π¹ Doradus

Location of π1 Doradus on the map (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Dorado
Right ascension	06h 22m 38.27576s[1]
Declination	−69° 59′ 02.5605″[1]
Apparent magnitude (V)	5.54±0.01[2]
Characteristics
Spectral type	K5 III[3]
U−B color index	+1.82[4]
B−V color index	+1.51[4]
Astrometry
Radial velocity (Rv)	15.7±2.9[5] km/s
Proper motion (μ)	RA: +26.170 mas/yr[1] Dec.: +34.330 mas/yr[1]
Parallax (π)	4.9606±0.0769 mas[1]
Distance	660 ± 10 ly (202 ± 3 pc)
Absolute magnitude (MV)	−0.83[6]
Details
Mass	1.67[7] M☉
Radius	56.5±2.9[8] R☉
Luminosity	530±12[9] L☉
Surface gravity (log g)	1.41[10] cgs
Temperature	4,019+3 −4[11] K
Metallicity [Fe/H]	+0.10[10] dex
Rotational velocity (v sin i)	1.8±1.4[12] km/s
Age	2.67[7] Gyr
Other designations
π1 Dor, 38 G. Doradus[13], CPD−69°607, GC 8310, HD 45669, HIP 30321, HR 2352, SAO 249532, TIC 167088607[14]
Database references
SIMBAD	data

Pi¹ Doradus has a stellar classification of K5 III,^[3] indicating that it is an evolved K-type giant star. It has 1.67 times the mass of the Sun but at the age of 2.67 billion years,^[7] it has expanded to 56.5 times the radius of the Sun.^[8] It radiates 530 times the luminosity of the Sun^[9] from its enlarged photosphere at an effective temperature 4,019 K^[11] Gaia DR3 stellar evolution models give a larger radius of 63.2 R_☉ and a higher luminosity of 938 L_☉.^[1] Pi¹ Doradus is metal enriched with an iron abundance of [Fe/H] = +0.10 or 126% that of the Sun's.^[10] Like many giant stars it spins slowly—having a projected rotational velocity of 1.8 km/s.^[12]