Humason 1-1 is a tiny
planetary nebula in Cassiopeia. It has been reported to be
brighter than the magnitude listed above, perhaps as bright as 12.4
magnitude, rendering it visible in a 6-inch scope. At least
130x is required to see its tiny, blue-green disk.
In
my 18-inch f/4.5 Dob it appeared stellar at 97x. The best view
came at 430x. At this magnification the elongated, uniformly
illuminated disk was distinctly visible. I saw it as slightly
greenish in color. What appeared to be a central star was
intermittently visible, but the surface brightness of the
"central bright spot" was only ever so slightly higher
than that of the surrounding nebula. 
The field in an 18-inch at
95x. North is down and east is to the right. |
