NGC 3572
Open cluster NGC 3572, in the southern constellation of Carina, surrounded by peculiar looking HII region.
Image data: Ha-OIII-RGB (Ha 18x20m, OIII 14x20m, R 8x20m, G 8x20m, B 8x20m); seeing 0.9-1.1 arcsec, 80cm f/7 Astrooptik Keller corrected cassegrain, FLI Proline 16803, Baader Filters, Prompt 7 CTIO Chile, robotic data acquisition, processing Volker Wendel.