Rho Aquarii [SEP] constellation
Rho Aquarii
Rho Aquarii, Latinized from ρ Aquarii, is the Bayer designation for a binary star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of +5.34. Based upon parallax measurements made during the Hipparcos mission, this star is at a distance of roughly from Earth.
This is a single-lined spectroscopic binary, with the presence of a companion being revealed by Doppler shifts in the spectrum. The primary is a giant star with a stellar classification of . It
Aquarii and Rho Aquarii. Consequently, the Chinese name for Theta Aquarii itself is (, ). Possibly, the name "Lei", meaning "tears (weeping)" in Chinese, derives from the Chinese name for this star.
Properties.
Ancha belongs to the spectral class G8 with a luminosity class of III–IV suggesting that, at an age of 437 million years, this star is part way between the subgiant and giant stages of its evolution. Estimates of the star's mass range from 2.39