page 29 Crescent BubbleNB

                       Astrophotography by Keith B. Quattrocchi

                                 To see APOD version (November 13, 2008) please click here
               Joint Project by Keith B Quattrocchi and Mel Helm
                      "Soap Bubble Nebula"
                        Faint Bubble Nebula in Cygnus
                        Narrow Band Image
                    Now designated by the IAU as PN G75.5+1.7 (see below)
                                Note:  This object was first identified by Dave Jurasevitch    on July 6, 2008
              The IAU issued an electronic telegram
       regarding the discovery status and official designation
                  of this object (July 16, 2009). 
                The IAU notes that the object was previously unrecognized.
             It is now designated PN G75.5+1.7
              Also known as The Soap Bubble Nebula
                         Click here to read the telegram. 
                                     Copyright 2008
                                     Keith B Quattrocchi

Soap Bubble Nebula : In Cygnus

                                      Image Acquisition Information                      
                               Telescope:   16" RCOS Ritchey Chretien Telescope (ion milled at f/9) 
                               Camera:       SBIG STL-6303 M
                               Guiding:       SBIG AOL,  Astrodon  MOAG AOG (SBIG 237 with FLR)
                               Filters:        Astrodon Ha, SII, OIII
                               Mount:        Software Bisque Paramount ME
                               Acquisition Programs:   The Sky,CCDAutopliot III, CCD Soft. 
                               Processing ProgramsCCDStack, Maxim DL, Adobe Photoshop CS/3
                               Date: July 30-August 3, 2008                              
                               Time: 21 x20 min ( 7 hours) for each of Ha, SII, OIII
                               Total of 21 hours imaging time.                              
                               Processing:  CCD Stack and PhotoShop CS/3
Image Information:  Life can be stranger than fiction.  We believe this nebula to be 'co-discovered' (definately imaged and noted, as to "discoverd", this will depend on the finding of the IAU), first by Dave Jurasevich (of the Mt Wilson Observatory) on July 6, 2008 and submitted by him to the IAU on July 10, 2008.  His images were not posted at the time of our independant "discovery" (July 17, 2008).  He deserves recognition as being the first to image and submit this object.  You can learn about Dave's excellent work at and about his initial discovery of this nebula at .  Again, we all wish to note the term "discovery" is technically premature, as the final findings of the IAU are not yet available. 
     This "possible undesignated" "bubble-like" nebula was first noticed (by our group) as a possible object by Dr. Mel Helm, after inspecting an HII region near the Crescent Nebula, and later confirmed by myself in the image noted above.  It is an extremely faint object which to the best of our knowledge, as of this posting, has no designation.  It is felt to be either: 1)  An unusually symmetrical planetary nebula, ie, a small dying star throwing off it's atmosphere as it becomes a white dwarf (such as Abell 39) or 2)  A Wolf-Rayet Nebula, such as the Crescent Nebula or The Bubble Nebula (NGC 7635).  These are formed by massive stellar winds from a "Wolf-Rayet" star . Wolf-Rayet stars are believed to be normal, evolved massive stars with massive stellar winds.  These stellar winds evidently form when the CNO cycle is active, and the stars spectrum is dominated by ionized Helium and Nitrogen.
The following links are also available:
1)   For details regarding how this "Bubble-Like" Nebula was first found, you can go to the following link for more information: 
2)  The approximate coordinates of this "Bubble-Like" Nebula are
                 RA: 20 15 22.16 and Dec +38 02 41.9. 
    To see the location of this object, in relation to the Crescent Nebula (NGC 6888 or Caldwell  27), please follow the following link:
3)   A few weeks after Dave Jurasevich submitted his image tot he IAU (as apparntly the first to identify the object), we also submitted it to the IAU.  This link takes you to a page where we respond to their questions.  Since this was done we have not heard back form the IAU.  The link is:
Processing Information:  The image is a layered  Hubble Palette narrrow band image assembled in CCDStack. The first layer contained nothing under the "Luminance channel", whereas the second contained the Ha data under the luminace channel (which highlights the fine Ha nebulosity data).  These two layers were combined with the layers option in Photoshop CS/3, optimizing the best characteristics of each layer.  Further processing was accomplished in Photoshop CS/3 (curves and levels, shadows/highlights, high pass filtering).

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