Pi2 Doradus
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  | |
| 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, 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]
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]
