NGC 6729 [SEP] constellation
NGC 6729
NGC 6729 is a reflection/emission nebula in the constellation Corona Australis. It was discovered by Johann Friedrich Julius Schmidt in 1861.
This fan-shaped nebula opens from the star R Coronae Australis toward the star T CrA to the south-east. R CrA is a pre-main-sequence star in the Corona Australis molecular complex, one of the closer star-forming regions of the galaxy at a distance of 130 pc.
surrounding nebula, NGC 6729, which brightens and darkens with it. The nebula is often compared to a comet for its appearance in a telescope, as its length is five times its width. S Coronae Australis is a G-class dwarf in the same field as R and is a T Tauri star. Nearby, another young variable star, TY Coronae Australis, illuminates another nebula: reflection nebula NGC 6726–7. TY Coronae Australis ranges irregularly between magnitudes 8.7 and 12.4, and the brightness of the nebula varies with it.