Lambda Doradus

λ Doradus
Location of λ Doradus on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Dorado
Right ascension 05h 26m 19.26577s[1]
Declination −58° 54′ 45.06402″[1]
Apparent magnitude (V) 5.13±0.01[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type G6 III[4] or G8 III[5]
B−V color index +1.00[6]
Astrometry
Radial velocity (Rv)10±0.07[7] km/s
Proper motion (μ) RA: −9.792 mas/yr[1]
Dec.: +33.350 mas/yr[1]
Parallax (π)5.9209 ± 0.0712 mas[1]
Distance551 ± 7 ly
(169 ± 2 pc)
Absolute magnitude (MV)−0.6[8]
Details[9]
Mass3.82±0.16 M☉
Radius21.1±0.5 R☉
Luminosity252±9 L☉
Surface gravity (log g)2.41±0.12 cgs
Temperature5,009±43 K
Metallicity [Fe/H]−0.06±0.04 dex
Rotational velocity (v sin i)5.2±1[10] km/s
Age258[11] Myr
Other designations
λ Dor, 23 G. Doradus[12], CPD−59°472, FK5 2410, GC 6749, HD 36189, HIP 25429, HR 1836, SAO 233981[13]
Database references
SIMBADdata

Lambda Doradus (Lambda Dor), Latinized from λ Doradus, is a solitary[14] yellow hued star located in the southern constellation Dorado. It has an apparent magnitude of 5.13,[2] making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the star at a distance of 551 light years,[1] and it is currently receding with a heliocentric radial velocity of 10 km/s.[7]

Lambda Dor has a stellar classification of either G6[4] or G8 III,[5] depending on the source. Nevertheless, both indicate that it is a red giant, and it is currently on the red giant branch fusing hydrogen in a shell outside a helium core.[3] At present it has 3.82 times the mass of the Sun[9] and at an age of 258 million years, it has expanded to a radius of 21.2 R☉.[9] It radiates at over 250 times the luminosity of the Sun from its photosphere at an effective temperature of 5,009 K.[9] Lambda Dor is slightly metal deficient, with an iron abundance 12% below solar levels.[9] It currently spins with a projected rotational velocity of 5.2 km/s.[10]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Setiawan2003 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 Keenan1989 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Jofré2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference dasilva2021 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).