This object is proving an interesting challenge and is becoming a bit of an obsession. Strange seeing that it won't be a particularly stunning visual display but an enigma all the same.
I have completed enough data capture for now to kick off the processing activity in earnest. The data set includes: 42 x OIII @ 1800s; 41 x Ha @ 1800s; 24 Red @ 300s; 24 Gre @ 300s; 24 Blu @ 300s.
The attached screen shots show the Ha and OIII Masters as output from the Pixinsight calibration, cosmetic correction and registration process. Following this I cropped the registered images and then ran them through the PI Image Integration tool. I did it this way as the OIII master showed some gradients around the edge of the field so I felt it better to crop the master first before doing image integration.
I was puzzled by the apparent extended nebulosity at the 9 o'clock position in the Ha master as this is not apparent in other images of this object that I had found previously. A search led me to the
Sharpless Catalogue site which has some great information on
SH2-313 (Abell 35) and many other Sharpless objects. In this case the information includes an inverted image of the Ha data taken with a TMB 152mm refractor.
I did a quick stretch of my Ha data to compare it to the inverted image found on the Sharpless site and the result is the second screen shot that I have attached. The data that I have captured is present in the image from the Sharpless site which is good. We shall now press on with processing the data.