Lambda Doradus

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]

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]
Distance	551 ± 7 ly (169 ± 2 pc)
Absolute magnitude (MV)	−0.6[8]
Details[9]
Mass	3.82±0.16 M☉
Radius	21.1±0.5 R☉
Luminosity	252±9 L☉
Surface gravity (log g)	2.41±0.12 cgs
Temperature	5,009±43 K
Metallicity [Fe/H]	−0.06±0.04 dex
Rotational velocity (v sin i)	5.2±1[10] km/s
Age	258[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
SIMBAD	data

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]