Great picture Mike, but it's not HH666 in the square shown. You
do have HH666, but it's lower down in your pic. The thumbnail shows a Hubble pic of HH666. See here for confirmation
http://iopscience.iop.org/1538-3881/...127_5_2793.pdf
I haven't been able to identify what you've shown. It just comes up with informative stuff like "nebula in Carina" when I search Hubble pics.
Geoff
Note added: Scratched around a bit more. What you have is HH901/2 aka the Mystic Mountain. See here
https://archive.stsci.edu/prepds/carina/