Sharpless 2-240 / Simeis 147 - in Taurus and Auriga
click the image for a 50% pixel view or HERE to return to the index page

 this is a fascinating super nova reminant on the border of Taurus and Auriga. The filiments span almost 3 degrees of sky and have extremely low surface brightness, usually not even seen in the individual sub-exposures. The thin filaments are primarily H alpha with the usual H beta, and a tiny amount of O-III and S-II. The dwarf that produced the supernova is certainly lost in the massive field of stars in the milky way. One of the greaest challenges in imaging this is that field of stars. Below the info table is a 290 minute stack of RGB subs that show only the starfield. With star separation, and extreme stretching, there is the faint evidence of the nebulosity, but it took another hour of H-alpha imaging to bring the details even to this stage. I will probably add more Ha at a later time. North is to the left in this image.

 Telescope Nikkor 180mm f2.8 ED AIs lens at f 2.8 riding piggyback on the LX 200 classic
Camera Canon XT/350d modified with Baader type 1 filter by Hap Griffin
Exposure  29 ten-minute sub-exposures in RGB with
6 fifteen-minute subs at iso 1600 in H-alpha.
 Guiding  PHD Guide from Stark labs with Meade DSI pro I on Meade 12-inch LX 200 Classic at f/3.3
 Software Images acquired, calibrated, stacked and color corrected with Nebulosity 2.3.7 from Stark Labs. Further processing in Photoshop CS 3. For this image, I took a lot of RGB, searching for the nebulosity, and then added an hour of H alpha as tone mapped luminance with red and blue to finally bring out the details and color. Star color was extracted from the RGB stack and added in final processing.
on-line links to more information    check Google for several great images. Some notes on methods can be found on J-P Metsavainio's blog at

and here is the final stack of 29 ten-minute subs at iso 1600. Stretched in Photoshop and color balanced. Oh well, it is good for star color.....
surprisingly little nebulosity.... like none... {:>))