The supernova remnant Sh2-224 in Auriga really is a challenging target. It is soooo dim! I spent about 14 hours imaging time for this HOO-RGB:
Full resolution and data on Astrobin:
The telescope used was the 130/910 mm TS Photoline apo with 0.79x reducer and the ASI1600mmp attached.
106 x 300s Ha
57 x 300s OIII
25 x 30s R/G/B for the stars
Edited by Pete_xl, 13 November 2019 - 04:18 PM.