the newly discovered bubble in Cygnus, PNG75.5+1.7, a work in progress
click the image for a larger one (color only), or HERE to return to the index page


Ha only

This is a tough one! first pass at the whole stack, some artifacts, and a few more hours of good air to go! I am collecting some more O3
to add to the color, plus a lot more RGB, and will do a lot more experimenting with method... the O3 image is almost not there!
I am also working on a wide field of this region that includes ngc 6888, the Crescent or "van Gogh's Ear" nebula.
 Telescope Meade LX 200 Classic 12-inch at f/6.8 on Mitty Wedge in the Julian Observatory.
Camera Canon XT/350d modified with Baader type 1 filter by Hap Griffin, Astronomik 12nm H alpha clip for the Ha, and Astronomik 12nm O3 folter for that.
Exposure Sixty three 15 minute sub-exposures at iso 1600 for 945 total minutes (15.75 hours) in Ha plus 7 hours of O3 and 7 hours ofRGB.
 Guiding Meade OAG using PHD Guide from Stark labs with Meade DSI pro I.
 Software Images acquired, calibrated, stacked and cropped with Nebulosity 2.3 from Stark Labs. Further processing in Photoshop CS 3.
on-line links to more information 

check Dave Jurasovich's site at
he discovered it in July of 2008.

S&T has a nice article in July 2010

also, the second imager with story at Kieth Quattrocchi's site at