RV Caeli

RV Caeli is a red giant star in the constellation Caelum. With an apparent magnitude of 6.4, it's barely visible to the naked eye, but this can vary. RV Caeli has a high radial velocity, which means it's moving away from the Solar System, and is currently located away using parallax.
Properties.
This star is a red giant who has exhausted hydrogen at it's core. It has a similar mass to the Sun, but has ballooned to 65 times the radius. It a very luminous star, with a luminosity about 1,000 times greater than our Sun. RV Caeli has a cool effective temperature of 3,984 K, which gives it a red hue. It is considered to be on the asymptotic giant branch, having exhausted its core hydrogen and helium.
Variability.
Hipparcos has found it to vary between its photometric values of 6.44 and 6.56, which roughly corresponds with the magnitude as seen with the naked eye. It was first suspected of variability in 1970. A 1982 survey again identified suspected variations, but could not confirm it was a variable star. It was confirmed as a variable star in 1999 on the basis of the Hipparcos photometry and given the variable star designation RV Caeli.