The looping nebula NGC3576 and lower cluster/nebula NGC3603.
A nebula duo in the southern constellation of Carina.
NGC3576, is an emission nebula appearing connected to NGC3603 (left), but it is not. NGC3603 is much larger and twice the distance with both happening to be in the same line of site for us.
This is a variation on the so-called Hubble colour palette. Luminance is mostly Hydrogen-alpha, with colour coming from Red=SII, Green=Ha and Blue=OIII. Each filtered image made up of 3 hours (15 minutes per sub image) for a total of 9 hours.
Taken with an ST10xe and a 6” Maksutov-Newtonian telescope at f/6, using 6nm Ha, SII and OIII filters.