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