39 Arietis [SEP] constellation
39 Arietis
39 Arietis (abbreviated 39 Ari), officially named Lilii Borea , is a star in the northern constellation of Aries. It is visible to the naked eye with an apparent visual magnitude of +4.5. The distance to this star, as determined from an annual parallax shift of 19.01 mas, is approximately .
Nomenclature.
"39 Arietis" is the star's Flamsteed designation.
This star was described as "Lilii Borea" by Nicolas-Louis de Lacaille in 1757, 
as a star
magnitude 3.63, it is a blue-white main sequence star of spectral type B8V around 166 light-years distant. 39 Arietis is an orange giant star of magnitude 4.51 and spectral type K1.5III that is around 171 light-years distant.
The constellation was renamed Vespa by Jakob Bartsch in 1624. The renaming by Bartsch may have been intended to avoid confusion with another constellation, created by Plancius in 1598, that was called Apis by Bayer in 1603. Plancius called this earlier constellation Muia (Greek for fly) in