Lambda¹ Fornacis

λ¹ Fornacis, Latinized as Lambda¹ Fornacis, is a red giant star in the southern constellation of Fornax. It is just visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of 5.91. The star is located 383 light years from the Sun, based on stellar parallax, and is drifting further away with a radial velocity of +10 km/s.

Lambda¹ Fornacis

Location of Lambda1 Fornacis (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Fornax
Right ascension	02h 33m 07.0259s[1]
Declination	−34° 38′ 59.882″[1]
Apparent magnitude (V)	5.91[2]
Characteristics
Evolutionary stage	Horizontal branch[2]
Spectral type	K0/1III[3]
U−B color index	+2.14[4]
B−V color index	+1.06[4]
Astrometry
Radial velocity (Rv)	+10.29±0.14[1] km/s
Proper motion (μ)	RA: −18.216±0.017[1] mas/yr Dec.: −18.058±0.026[1] mas/yr
Parallax (π)	8.5123 ± 0.0286 mas[1]
Distance	383 ± 1 ly (117.5 ± 0.4 pc)
Absolute magnitude (MV)	0.67[5]
Details
Mass	2.32[2] M☉
Radius	12.38[2] R☉
Luminosity	66[2] L☉
Surface gravity (log g)	2.32[2] cgs
Temperature	4,770[2] K
Metallicity [Fe/H]	0.18±0.14[2] dex
Rotational velocity (v sin i)	2.00[2] km/s
Other designations
λ1 For, CD–35°877, GC 3067, HD 15975, HIP 11867, HR 744, SAO 193763, PPM 278055, GCRV 53183[6]
Database references
SIMBAD	data

λ¹ Fornacis is a K-type giant star with a stellar classification of K0/1III, showing it has exhausted its core hydrogen and evolved away from the main sequence. It is currently on the horizontal branch, fusing helium in its core. The star has 2.3 times the mass of the Sun and 12 times its radius. It is radiating 66 times the luminosity of the Sun from its photosphere at an effective temperature of 4,770 K. The abundance of elements with mass higher than helium is similar to the Sun.