Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Corona Australis |
Right ascension | 19h 08m 20.96980s [1] |
Declination | −40° 29′ 48.1155″ [1] |
Apparent magnitude (V) | 4.57 [2] |
Characteristics | |
Evolutionary stage | horizontal branch [3] |
Spectral type | K1III [4] |
B−V color index | +1.070±0.052 [2] |
Astrometry | |
Radial velocity (Rv) | +21.24±0.19 [1] km/s |
Proper motion (μ) |
RA: +47.344
[1]
mas/
yr Dec.: −27.047 [1] mas/ yr |
Parallax (π) | 18.6963 ± 0.3123 mas [1] |
Distance | 174 ± 3
ly (53.5 ± 0.9 pc) |
Absolute magnitude (MV) | 0.93 [5] |
Details | |
Mass | 1.50±0.01 [3] M☉ |
Radius | 11.37+0.23 −0.65 [1] R☉ |
Luminosity | 54.7±1.1 [1] L☉ |
Surface gravity (log g) | 2.59±0.10 [3] cgs |
Temperature | 4,654+139 −45 [1] K |
Metallicity [Fe/H] | +0.01±0.10 [3] dex |
Age | 2.80±0.13 [3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Delta Coronae Australis is a single [7] star located in the southern constellation of Corona Australis. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.57. [2] The star is located about 174 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +21 km/s. [1]
This object is an evolved giant star with a stellar classification of K1III. [4] After exhausting the supply of hydrogen at its core, the star expanded off the main sequence and now has 11 [1] times the radius of the Sun. It is a red clump giant, [3] [5] which indicates it is on the horizontal branch and is generating energy through core helium fusion. The star is 2.8 [3] billion years old with 1.5 [3] times the mass of the Sun. It is radiating 55 [1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,654 K. [1]