Pi2 Doradus

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]
Distance277 ± 1 ly
(85.1 ± 0.4 pc)
Absolute magnitude (MV)+0.78[6]
Details[7]
Mass1.80±0.07 M☉
Radius9.84±0.16 R☉
Luminosity51.1±1.1 L☉
Surface gravity (log g)2.66±0.08 cgs
Temperature4,919±29 K
Metallicity [Fe/H]−0.26±0.03 dex
Rotational velocity (v sin i)<2.0[8] km/s
Age1.61±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
SIMBADdata

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]

  1. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Laney2011 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Gomes da Silva2021 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).