Mu Coronae Australis

μ Coronae Australis
Location of Mu CrA (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 47m 44.61759s[1]
Declination −40° 24′ 22.1955″[1]
Apparent magnitude (V) 5.22±0.01[2]
Characteristics
Spectral type G5/6 III[3]
B−V color index +0.78[4]
Astrometry
Radial velocity (Rv)−18.2±0.8[5] km/s
Proper motion (μ) RA: +23.690 mas/yr[1]
Dec.: −18.373 mas/yr[1]
Parallax (π)8.4545 ± 0.0993 mas[1]
Distance386 ± 5 ly
(118 ± 1 pc)
Absolute magnitude (MV)−0.22[6]
Details[7]
Mass3.07±0.11 M☉
Radius11.4±0.3 R☉
Luminosity104±5 L☉
Surface gravity (log g)3.15±0.08 cgs
Temperature5,448±27 K
Metallicity [Fe/H]−0.14±0.03 dex
Rotational velocity (v sin i)7.7±1[8] km/s
Age361±66[9] Myr
Other designations
μ CrA, 24 G. Coronae Australis[10], CD−40°12807, CPD−40°8648, FK5 3492, GC 25722, HD 173540, HIP 92226, HR 7050, SAO 229285[11]
Database references
SIMBADdata

Mu Coronae Australis (Mu CrA), Latinized from μ Coronae Australis, is a solitary yellow-hued star[12] located in the southern constellation Corona Australis. It has an apparent magnitude of 5.22,[2] making it faintly visible to the naked eye. Gaia DR3 parallax measurements put it 386 light years away[1] and is currently approaching the Solar System with a heliocentric radial velocity of −18.2 km/s.[5] At its current distance, Mu CrA's brightness is diminished by 0.31 magnitudes due to interstellar dust.[13] It has an absolute magnitude of −0.22.[6]

Mu CrA has a stellar classification of G5/6 III,[3] indicating that it is an evolved G-type star with the characteristics of a G5 and G6 giant star. At an age of 365 million years,[9] the star has exhausted the supply of hydrogen at its core and has expanded to 11.4 times the radius of the Sun. At present it has 3.07 times the mass of the Sun and radiates 104 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,448 K. Mu CrA is slightly metal deficient and spins modestly with a projected rotational velocity of 7.7 km/s.[8]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Feltzing2001 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).