NGC 1769, NGC 1773, NGC 1760, etc. The small structure toward 3 o'clock that looks like "Thors Other Helmet' is SNR N11.


Red: SII 12 hrs, Green: H-alpha 8hrs, Blue: OIII 8hrs, all in 1hr subs.

The largest, most central, and right-most of the three central blue blobs is NGC 1763.

Compare the two large cavities. The one immediately above NGC 1763 has a substantially blue OIII wall and few bright stars within. The larger cavity, toward 4 o'clock from 1763, has a more heterogeneous wall, with more OIII below and more H-alpha, SII above, and contains rich bright open cluster NGC 1761.