Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Corona Australis |
Right ascension | 19h 10m 01.75580s [1] |
Declination | −39° 20′ 26.8644″ [1] |
Apparent magnitude (V) | 4.10±0.01 [2] |
Characteristics | |
Spectral type | K0 II/III CN1.5 [3] |
U−B color index | +1.07 [4] |
B−V color index | +1.20 [4] |
R−I color index | +0.61 [4] |
Astrometry | |
Radial velocity (Rv) | 2.7±0.7 [5] km/s |
Proper motion (μ) |
RA: +4.37
mas/
yr
[1] Dec.: −36.65 mas/ yr [1] |
Parallax (π) | 6.88 ± 0.25 mas [1] |
Distance | 470 ± 20
ly (145 ± 5 pc) |
Absolute magnitude (MV) | −1.71 [6] |
Details | |
Mass | 5.17±0.26 [7] M☉ |
Radius | 38.5±1.9 [8] R☉ |
Luminosity | 614±33 [9] L☉ |
Surface gravity (log g) | 1.26 [10] cgs |
Temperature | 4,575±55 [11] K |
Metallicity [Fe/H] | +0.24 [10] dex |
Rotational velocity (v sin i) | 6.2±2 [12] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Beta Coronae Australis (Beta CrA), Latinized from β Coronae Australis, is a solitary star [15] located in the southern constellation Corona Australis. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.10. [2] The star is located around 470 light years distant from the Sun based on parallax, [1] and is drifting further away with a radial velocity of 2.7 km/s. [5] At its current distance, Beta CrA's brightness is diminished by 0.29 magnitudes due to interstellar dust. [16]
Beta CrA has a stellar classification of K0 II/III CN1.5, [3] indicating that it is an evolved K-type star with the blended luminosity class of a bright giant and a regular giant star. The suffix CN1.5 indicates that the object has an anamolous overabundance of cyano radicals in its spectrum, making it a CN star. Having exhausted the supply of hydrogen at its core, the star has expanded to 39 times the Sun's girth. [9] It has 5.17 times the mass of the Sun shines with a luminosity 614 times that of the Sun [9] from its photosphere at a surface temperature of 4,575 K. [11] Beta CrA is metal enriched (174% solar iron abundance [10]) and spins modestly with a projected rotational velocity of 6.2 km/s. [12]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Corona Australis |
Right ascension | 19h 10m 01.75580s [1] |
Declination | −39° 20′ 26.8644″ [1] |
Apparent magnitude (V) | 4.10±0.01 [2] |
Characteristics | |
Spectral type | K0 II/III CN1.5 [3] |
U−B color index | +1.07 [4] |
B−V color index | +1.20 [4] |
R−I color index | +0.61 [4] |
Astrometry | |
Radial velocity (Rv) | 2.7±0.7 [5] km/s |
Proper motion (μ) |
RA: +4.37
mas/
yr
[1] Dec.: −36.65 mas/ yr [1] |
Parallax (π) | 6.88 ± 0.25 mas [1] |
Distance | 470 ± 20
ly (145 ± 5 pc) |
Absolute magnitude (MV) | −1.71 [6] |
Details | |
Mass | 5.17±0.26 [7] M☉ |
Radius | 38.5±1.9 [8] R☉ |
Luminosity | 614±33 [9] L☉ |
Surface gravity (log g) | 1.26 [10] cgs |
Temperature | 4,575±55 [11] K |
Metallicity [Fe/H] | +0.24 [10] dex |
Rotational velocity (v sin i) | 6.2±2 [12] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Beta Coronae Australis (Beta CrA), Latinized from β Coronae Australis, is a solitary star [15] located in the southern constellation Corona Australis. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.10. [2] The star is located around 470 light years distant from the Sun based on parallax, [1] and is drifting further away with a radial velocity of 2.7 km/s. [5] At its current distance, Beta CrA's brightness is diminished by 0.29 magnitudes due to interstellar dust. [16]
Beta CrA has a stellar classification of K0 II/III CN1.5, [3] indicating that it is an evolved K-type star with the blended luminosity class of a bright giant and a regular giant star. The suffix CN1.5 indicates that the object has an anamolous overabundance of cyano radicals in its spectrum, making it a CN star. Having exhausted the supply of hydrogen at its core, the star has expanded to 39 times the Sun's girth. [9] It has 5.17 times the mass of the Sun shines with a luminosity 614 times that of the Sun [9] from its photosphere at a surface temperature of 4,575 K. [11] Beta CrA is metal enriched (174% solar iron abundance [10]) and spins modestly with a projected rotational velocity of 6.2 km/s. [12]