R Coronae Australis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 19h 01m 53.6503s[1] |
| Declination | −36° 57′ 07.87″[1] |
| Apparent magnitude (V) | +11.91 |
| Characteristics | |
| Spectral type | B5IIIpe[1] |
| Variable type | irregular[2] |
| Astrometry | |
| Radial velocity (Rv) | -36 km/s |
| Proper motion (μ) | RA: -28.30 mas/yr Dec.: 20.57 mas/yr |
| Parallax (π) | 40.93 ± 27.95 mas |
| Distance | approx. 80 ly (approx. 20 pc) |
| Details | |
| Other designations | |
R Coronae Australis (R CrA) is a variable star in the constellation Corona Australis.[1] It has varied between magnitudes 10 and 14.36.[2] A small reflection/emission nebula NGC 6729 extends from star towards SE.
This star is moving toward the Solar System with a radial velocity of 36 km s−1. In roughly 222,000 years, this system may approach within 1.77 light-years (0.54 parsecs) of the Sun. However, this estimate has a considerable margin of error, so the actual distance remains uncertain.[3]
A colour photo of the R Coronae Australis region in the southern Milky Way.
References
- 1 2 3 4 "R Coronae Australis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 29 June 2014.
- 1 2 BSJ (14 June 2010). "R Coronae Australis". AAVSO Website. American Association of Variable Star Observers. Retrieved 29 June 2014.
- ↑ Dybczyński, P. A. (April 2006), "Simulating observable comets. III. Real stellar perturbers of the Oort cloud and their output", Astronomy and Astrophysics 449 (3): 1233–1242, Bibcode:2006A&A...449.1233D, doi:10.1051/0004-6361:20054284
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