R Coronae Australis

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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
Spectral type B5IIIpe[2]
Variable type INSA[3]
Radial velocity (Rv)-36.0 ± 4.9[4] km/s
Proper motion (μ) RA: -28.30[1] mas/yr
Dec.: 20.57[1] mas/yr
Parallax (π)40.93 ± 27.95[1] mas
Distanceapprox. 80 ly
(approx. 20 pc)
Other designations
CD−37° 13027, HIP 93449, Wray 15-1887
Database references

R Coronae Australis (R CrA) is a variable star in the constellation Corona Australis.[2] It has varied between magnitudes 10 and 14.36.[5] A small reflection/emission nebula NGC 6729 extends from the 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.[6]

A colour photo of the R Coronae Australis region in the southern Milky Way.


  1. 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode 2007A&A...474..653V. doi:10.1051/0004-6361:20078357. http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL.
  2. 2.0 2.1 Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  3. Samus, N. N.Expression error: Unrecognized word "etal". (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode 2009yCat....102025S.
  4. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. arXiv:1606.08053. Bibcode 2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  6. 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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