M27 outer halo and more from home

Observed again with the 20-inch and PVS-14.  Went back to the Dumbbell for a closer look, and some other objects:

M27 Dumbbell Nebula: While searching the internet for images of M27 to write the last report, I noticed some deep images showed a cloudy outer shell around the Dumbbell.  I didn't notice it that session because I didn't know it was there, and it's subtle enough to escape all but the most attentive observing.  I purposely tried to see it this time, with success.  With the 3nm Ha filter, it appeared while changing gain from high to low, but once seen I could hold it, adjusting the gain for the best and most contrasty view.  It appeared as a very faint lion's main-like cloud, a faint mottled nebulous contrast change with the rest of the sky.  There was a fainter sky gap in between the cloud and the apple-core shaped Dumbbell nebula proper--giving some sense of separation, but it did feel connected to the main nebula.  The outer halo moved with the scope, so I knew it wasn't a hot-spot in the PVS-14.  It did not make a quite uniform circle around the whole nebula, it was extremely faint on the whole southern side, and brighter on the northern.  This image, while in color and a much closer image scale -- and more detailed -- gives a general idea of what I saw. 

M57 Ring Nebula: Central star seen unfiltered high gain, but only hazily seen (through nebula) otherwise.  Different filters give more complexity to the ring itself, such as the sharper, brighter southern edge, the fainter but very subtly mottled norther section, and the faint diffuse extensions (breakouts?).  I remember the ring has an outer shell too, but didn't see it.

NGC 6743: A ringlet of stars near a bright one, hardly separated from the rest of the field.   

M 56: Small oval cloud of lumpy, not quite resolved faint stars, with several brighter stars superimposed and a loose spray, especially to the west, which could be field stars.  

NGC 6765 Small, non-stellar, elongated like a galaxy with a spray of faint nebula on the southeast side.  Seen with Ha and dual band.  The "spray" on the southeast side is the brighter section of halo which, in deep images, goes around the inner elongated halo of the planetary nebula. 

NGC 6813 Appears like the core of an elliptical galaxy, bright slightly elongated small non-stellar brightness, with a nebulous wedge shape coming from it to a nearby star to the NW.  There appears to be a dark cut-off or nibble in the southeast rim of the bright "core."  Planetary nebula, seen in dual band and Ha filters. 

Sh 2-92 Very faint, vague cloudy haze, no defined edge, oval shape if anything.  Relatively brighter to the south with much fainter extensions to the north, nearly the whole FOV, so a bit less than 1-degree in size.  There are some faint stars clustered in front of it so one night think it's a very faint open cluster..  shows with all the Ha filters.  Vogel: "Sh 2-92 is ionised by the Wolf-Rayet star WR 127, a binary star with an O9V companion, at a distance of 3700 parsecs according to one source. Avedisova adds a second ionising star, the O7 Ib supergiant HD 332755 and gives a larger distance estimate of 4740 +/- 100 parsecs. 

NGC 6842: Small, faint, slightly stretched out of round NE-SW, seen with all the Ha filters -- though no central star when filtered. It seems very ring like, with a defined, if soft edge, and thicker / brighter doughnut on the outer perimiter, and slightly fainter surface brightness to the middle.  

IC 4954 & 4955 Seen best with dual band, it is a fairly small wedge-shaped cloud, with some very faint surrounding nebulosity (which might be background) taking nearly the whole FOV.  For some reason it reminded me of a car burning oil and the bluish cloud that would come from the tailpipe.  A detail I did not have the magnification to see is the dark lane in 4954.  These are reflection nebula surrounding open cluster Roslund 4, which is around 30 stars split in two groups illuminating the gas and dust around them. 6500 light years away and approximately 4 million years old. 

NGC 6894 Beautiful fat ring planetary nebula, well seen in all Ha filters.  Dark center but with no central star, defined but soft edges, mostly even surface brightness but feels subtly mottled or highlighted with some brighter sections around the ring. 

Since outer halos have become a theme of this post, I will noted I found that NGC 6894 also has one, as captured in deep images.  As one internet source says, "Presumably this gas comes from the halo of the planetary nebula, which hit the interstellar medium. Notably, these streaks of glowing gas are parallel to the galactic plane. It is believed that they aligned along the galactic magnetic field."  So now I can make it a goal to see this one too.