Epsilon Coronae Australis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Corona Australis |
| Right ascension | 18h 58m 43.37714s |
| Declination | −37° 06′ 26.4865″ |
| Apparent magnitude (V) | +4.75 |
| Characteristics | |
| Spectral type | F4V Fe-0.8 |
| U−B color index | +0.01 |
| B−V color index | +0.39 |
| Variable type | W UMa |
| Astrometry | |
| Radial velocity (Rv) | 57.90 ± 1.2 km/s |
| Proper motion (μ) |
RA: −132.40 mas/yr Dec.: −110.62 mas/yr |
| Parallax (π) | 33.13 ± 0.33mas |
| Distance | 98.4 ± 1.0 ly (30.2 ± 0.3 pc) |
| Orbit | |
| Period (P) | 0.59143357 ± 0.00000016 d |
| Semi-major axis (a) | 3.795 ± 0.052 R☉ |
| Eccentricity (e) | 0 |
| Inclination (i) | 73.05 ± 0.16° |
| Longitude of the node (Ω) | 2.0113 ± 0.0033° |
| Periastron epoch (T) | JD 2442296.95907 ± 0.0070 |
| Details | |
| ε CrA A | |
| Mass | 1.9 M☉ |
| Radius | 2.167 R☉ |
| Temperature | 6481 ± 20 K |
| Rotational velocity (v sin i) | 148.5 km/s |
| ε CrA B | |
| Mass | 0.24 M☉ |
| Radius | 0.869 R☉ |
| Temperature | 5939 ± 19 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Coronae Australis (ε CrA), is a star located in the constellation Corona Australis. Epsilon Coronae Australis is also known as HR 7152, and HD 175813.
Epsilon Coronae Australis is an F4V dwarf star with an effective temperature of 6000 Kelvin. It ranges between apparent magnitudes of 4.74 to 5 over 14 hours, an absolute magnitude of +2.45, and a mass of 1.1 solar masses. Epsilon Coronae Australis is an W Ursae Majoris variable, indicating that it has a contact companion within the Roche Limit of the primary. The star is located at a distance of 30 pc (97 light years) from the Sun. Yildiz and colleagues estimated the age of the system at 2.83 ± 0.28 billion years based on study of the properties of the system and estimated rate of mass transfer. They found the current masses of the primary and secondary to be 1.72 ± 0.04 and 0.22 ± 0.02 solar masses respectively, from their original masses of 1.06 ± 0.03 and 2.18 ± 0.06 solar masses.
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