NGC 6188 nebula in Ara
author: Tom Davis/Novapix
reference: a-neb61-88012
Image Size 300 DPI: 33 * 33 cm
NGC 6188 is a red emission nebula located in southern constellation of Ara, about 4000 light years away. Inside of it, a young 3 millions year star cluster, NGC 6193. The hottest stars of the cluster, two closely spaced O-type giants HD 150135 and HD 150136, (the bright stars in the image) are the illumination source of the emission nebula.  Bottom left is the nebula NGC 6164. This image is in the classic "Hubble palette" where SII is assigned to red, H-alpha to green, and OIII to blue. RGB frames were taken for star colors.