Pi1 Doradus
K-type giant in the constellation Dorado
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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]
 | |
| Observation data Epoch J2000.0 Equinox 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]