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Coronet Cluster
The Coronet Cluster, also known as the R Coronae Australis, R CrA cluster after its best-known member, is a small open cluster located about 170 parsecs away in the southern constellation Corona Australis, isolated at the edge of the Gould Belt. The Coronet Cluster is 3.5 times closer to the Earth than the Trapezium Cluster, Orion Nebula Cluster. The cluster center is composed of mostly young stars. The variable T Coronae Australis is also a member, only one arc minute from R CrA. References External links * Gould Belt Open clusters Corona Australis NGC objects {{star-cluster-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
R Coronae Australis
R Coronae Australis (R CrA) is a variable binary system in the constellation Corona Australis. It has varied between magnitudes 10 and 14.36. A small reflection/ emission nebula NGC 6729 extends from the star towards SE. It is also the brightest feature of the Coronet Cluster, therefore sometimes called R CrA Cluster. This star is moving toward the Solar System with a radial velocity of . It was previously believed that in roughly 222,000 years, this system could have approached within of the Sun. However, the estimate had a considerable margin of error in it. With the release of Gaia DR2, the star was determined to be 4 times further from the Sun than initially believed, constraining the approach to only . Examination of other objects known to be in the same star-forming region gives a distance of , suggesting an error in the Gaia parallax for R CrB itself. A companion to the star was proposed in 2019 with a mass between 0.1 and 1 Solar masses, depending on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |