Alpha Coronae Australis
Star in the constellation Corona Australis / From Wikipedia, the free encyclopedia
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Alpha Coronae Australis or α Coronae Australis, officially named Meridiana (/məˌrɪdiˈænə/),[10] is the brightest star in the constellation of Corona Australis and is located about 125 light-years from Earth.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Corona Australis |
Right ascension | 19h 09m 28.34097s[1] |
Declination | –37° 54′ 16.1022″[1] |
Apparent magnitude (V) | 4.102[2] |
Characteristics | |
Spectral type | A2V[3] |
U−B color index | +0.06[4] |
B−V color index | +0.04[4] |
Astrometry | |
Radial velocity (Rv) | −18.40±1.78[5] km/s |
Proper motion (μ) | RA: 84.87[1] mas/yr Dec.: −95.99[1] mas/yr |
Parallax (π) | 26.02 ± 0.25 mas[1] |
Distance | 125 ± 1 ly (38.4 ± 0.4 pc) |
Absolute magnitude (MV) | 1.11[6] |
Details | |
Mass | 2.57[7] M☉ |
Radius | 2.21[3] R☉ |
Luminosity | 31[8] L☉ |
Surface gravity (log g) | 4.08[7] cgs |
Temperature | 9,916±337[7] K |
Rotational velocity (v sin i) | 195[9] km/s |
Age | 254[2] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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