Sh2-188 is an interesting planetary nebula located about 700-850 light years (ly) away from Earth in the constellation Cassiopeia. Unlike many other planetary nebulae that are more symmetrically shaped, the Shrimp Nebula has a predominant crescent shape sculpted over its long expansion by the incredibly fast movement through the interstellar medium (ISM), with which it interacts. Located near the center of Sh2-188 is the central star moving rapidly through the ISM (toward the lower left in this image) and causing the nebula’s bow shape.
Although the brightest part of the arc in Sh2-188 is crescent-shaped, a fainter gas cloud can be seen in this image opposite the main arc, actually forming a closed ring.
Capture Dates: 10/21, 10/22, and 10/24/24
Equipment
EdgeHD 800 with 0.7x focal reducer @ 1422mm fL
Guidescope/Cam: Celestron OAG and ASI174mm mini
ASIAir Plus, ASI2600MM, ZWO AM5 mount, ZWO 7-position filter wheel
Filters:
Antlia 3nm Narrowband H-alpha 2": 73×300″ (6:05)
Antlia 3nm Narrowband Oxygen III 2": 91×300″ (7:35)
Antlia 3nm Narrowband Sulfur II 2": 84×300″ (7:00)
Antlia Pro-V RGB Filters: 30x60” (0:30)
Total Integration Time: 21:10
Processed with PixInsight and Adobe Photoshop.
Greg, nice image of a not often imaged target. Not sure this is on my headlights. I'll have to get a peek at how big it is but based on what you used to image, it must be on the smaller size. And yes, I'm no longer getting alerts to my subscription. I have no idea what's going on. We're having all kinds of IT issues.
Terri
@terri Thanks, Terri! Stellarium has its size as 10'x3', so not very large. I was going to use the HD8 at native fL (2032mm), but the f/10 always dissuades me a bit.
Sorry about the IT problems! Always something going on with computers/software/websites, right? Ugh.
Greg
