NGC 7008 (September 2017)

NGC 7008 is a planetary nebula in northern Cygnus.  It has strong H-α and OIII signatures.  But the OIII is brighter than the H-α, so the H-α shows up in this two-color composite as a whitening (or, near the center, a graying) of the OIII's cyan.  There is a hint of red around the center of the nebula.  NGC 7008 is said to be around 2800 light years away, and at that distance the nebula is about one light year across.

For this image, I gathered 7x720" in H-α and 8x720" in OIII, using Astronomik narrowband filters, through the CFF 290 Classical Cassegrain with the SXVF-H9 camera.