Delta Coronae Australis

Delta Coronae Australis
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]
Distance174 ± 3 ly
(53.5 ± 0.9 pc)
Absolute magnitude (MV)0.93[5]
Details[3]
Mass1.50±0.01 M☉
Radius11.25±0.11 R☉
Luminosity53±1 L☉
Surface gravity (log g)2.59±0.10 cgs
Temperature4,645±14 K
Metallicity [Fe/H]+0.01±0.10 dex
Age2.80±0.13 Gyr
Other designations
δ CrA, CD−40°13061, HD 177873, HIP 94005, HR 7242, SAO 229513[6]
Database references
SIMBADdata

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]

  1. ^ a b c d e f g h i j Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Gallenne2018 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Liu 2007 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).