Epsilon Circini

Epsilon Circini, Latinized from ε Circini, is a solitary^[6] star located in the southern constellation of Circinus. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.86.^[2] The distance to this star, as determined by a measured annual parallax shift of 7.63 mas, is around 430 light years. It is drifting closer to the Sun with a radial velocity of −4 km/s.

ε Circini

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Circinus
Right ascension	15h 17m 38.89307s[1]
Declination	−63° 36′ 37.6831″[1]
Apparent magnitude (V)	4.86[2]
Characteristics
Spectral type	K2.5 III[3]
U−B color index	+1.32[2]
B−V color index	+1.260±0.004[4]
Astrometry
Radial velocity (Rv)	−3.72±0.42[1] km/s
Proper motion (μ)	RA: +3.209[1] mas/yr Dec.: +9.344[1] mas/yr
Parallax (π)	7.5809±0.1085 mas[1]
Distance	430 ± 6 ly (132 ± 2 pc)
Absolute magnitude (MV)	−0.63[4]
Details
Mass	4.3[1] M☉
Radius	24[1] R☉
Luminosity	338[1] L☉
Surface gravity (log g)	2.22[1] cgs
Temperature	4,767[1] K
Other designations
ε Cir, CPD−63°3544, FK5 3205, HD 135291, HIP 74837, HR 5666, SAO 253088[5]
Database references
SIMBAD	data

This is an evolved K-type giant star with a stellar classification of K2.5 III.^[3] With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 24 times the girth of the Sun. It radiates about 338 times the solar luminosity from its photosphere at an effective temperature of 4,767 K.^[1]