SH2-308 is a neblula located near -23 declination created by a possible pre-supernova outburst from a rare Wolf-Raynet star which is the 2nd brightest star in the field near the center of the bubble. The feature appears to be maybe 60 light-years in diameter at a distance near 6000 light-years but considerable uncertainty exists. Because of the relatively low position in the sky for northern hemisphere imagers, approaching the many excellent results obtained by imagers who live south of the equator is quite a challenge for many reasons. As a consequence this result is from a combined effort with Ha/O3 data acquisition from two small observatories. Total of 1350 minutes from Caswell county North Carolina by Astrobin artist Rowland Archer with a SW Esprit 80 (36N) and 2040 minutes of data from Colin County Texas (33N) by myself with SW Esprit 120. SH2-308 was only at 32degrees max altitude in Texas location and imaged directly over the top of Dallas. Cameras were ASI1600MMpro on Esprit 80 and QSI6120 on Esprit 120. Data calibrated in Seril for NC data and PI for Texas data. Composite H&O masters were registered and stacked using AstroPixelProcessor with gradient removal also being done there with the resulting Ha and O3 masters before creation of HOO using APP. From that point Rowland and I decided to take the combined HOO as a starting point and from there play with our personal workflows of choice!

Esprit 80 data with ASI1600mm Pro used 300s subs and the QSI data was imaged with 600s subs with most of those binned2x2 (2 arc-sec/pixel binned) though the registration master ended up as one of the unbinned 1.02arc-sec/pixel Ha subs from the SW120. A total of 27.25 hours Ha, and 29.25 hours O3, collectively. My processing workflow shown here was totally in Pixinsight. First a mild mlt NR at linear stage followed by a 200 increment masked stretch. At that point using starnet+ made a starmask and created a starless version. The luminance was extracted from the starless image and the bright star artifacts removed by clone stamp. Then the mask softened with convolution and black point and midtones adjusted for good contrast. With the mask applied the nebula blues and reds were slightly increased with curves. After that very mild (0.26) localhistogram was applied at a very large (206) pixel scale. Finally the stars were very slightly reduced and tgvdenoise applied to create final result.