NGC 1491 (Dec. 2018)

This is 21x1800" with the SXVF-H9 through the 6nm Astronomik H-alpha filter and Synta-ONTC 8" f/4.95 Newt. The brighter star in the center driving the hydrogen emission is 11.2-magnitude BD +50 886, classified as O5 or O4.  Source.  The nebula is probably over 10,000 light years away. I was able to catch two nights on this nebula.  The first night was somewhat less transparent, but the data seemed good.  The second night had excellent transparency.