Denis
sage
Reged: 12/24/05
Posts: 243
Loc: Rennes, France
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Hello,
A french forum mate found a sort of "bubble nebula" on one of his picture.
We don't find anything at its subject.
Perhaps somebody know about this one.
It's a better view than the one of my forum mate on this page : http://www.astro-pics.com/6888-b.htm
You can see this bubble on the top right part of the picture
Do you know if it's a referenced object ?
Thanks
Denis
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Canon 10x42 IS binoculars.
Meade sc 4" on homemade fork equatorial mount.
homemade 10" and 14" dobsonian
Nikon photogear.
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Brooklyn
scholastic sledgehammer
Reged: 07/24/08
Posts: 870
Loc: Central New Jersey
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looks like a human brain 
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Meade 8.25"(209.55mm) LX-90 EMC (SCT)
Albert Einstein =>
“Intellectual growth should commence at birth and cease only at death.”
“If you can't explain it simply, you don't understand it well enough.”
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OldDeadOne
Pooh-Bah
Reged: 09/09/06
Posts: 1143
Loc: West Virginia
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I see two objects in the upper left of that picture that are roundish,and nothing in the upper right,but in the middle that sure does look like Galaxtus popped his brain right out of his head :P
Edit: I see the round spot,and it doesn't show up on another pic for comparison: http://www.jburnell.com/STL11000/IC1318-NGC6888HaHaGB_small.jpg
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Bert O'Dell
PROUD GOTO USER
LX200 10" Classic
various meade plossi's eyepieces
Konig MX70 40mm" eyepiece
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Insane under a full moon
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Bill Weir
Pooh-Bah
Reged: 06/01/04
Posts: 1299
Loc: Metchosin (Victoria), Canada
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If he can figure out the rather precise coordinates I suggest he uses this tool.
http://simbad.u-strasbg.fr/simbad/
Bill
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6'' Orion SkyQuest
12.5'' f/5 Custom Truss Dob
William Optics 80mm ZenithStar ED II
f/5 25" newtonian on a giant GEM, any time I want
Observing sessions grand total for 2008, 121.
So far in 2009, 92
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Denis
sage
Reged: 12/24/05
Posts: 243
Loc: Rennes, France
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Thanks for your answer.
We found this round nebula on many other pictures and on the DSS plates but it's very faint and you need a strong contrast to see it. That's certainly why it's not referenced.
Aladin and simbad have been use, but without success.
The coordinates are 20h15'21" 38°02'35"
Another view with the object faintly visible in the lower part slightly on the left :
http://www.rivesmax.fr/images/nebuleuses/crop.jpg
Not a big deal by the way, just curiosity.
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Canon 10x42 IS binoculars.
Meade sc 4" on homemade fork equatorial mount.
homemade 10" and 14" dobsonian
Nikon photogear.
Edited by Denis (09/01/08 05:06 AM)
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reiner
super member
Reged: 09/28/05
Posts: 100
Loc: Freiburg, Germany
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Hi Denis,
looks very interesting, like one of the more evolved PN shells. It is not extremely faint, there are several Abell PN, which are in the same category, as judged from their appearance on the POSS plates. Maybe you discovered a new one?
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Reiner
22" and 14" Dobs on EQ platforms
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BillFerris
Carpal Tunnel
Reged: 07/17/04
Posts: 2910
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Yesterday, I looked at the POSS-I and POSS-II plates through Skyview and the annulus is faintly visible in the DSS, DSS2 blue and DSS2 red images. It is centered approximately at 20 15 21.4, +38 02 32.7 and appears to be ~ 5' in diameter.
My immediate thought when seeing the object was, "Planetary nebula?" I checked Megastar and SIMBAD, but neither indicates an extended object at the above coordinates. Yesterday, I emailed Brian Skiff at Lowell. Brian confirmed that it appears to be a real object and suggested contacting Dave Riddle, who has studied the planetary nebulae catalogs in great detail. Late last night, I emailed Dave and am awaiting his response.
Bill in Flag
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Grand Canyon Adventure
Lowering the Threshold
18" Obsession
4.5" Meade 4500
10x50 Swift Audubon
Cosmic Voyage
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Denis
sage
Reged: 12/24/05
Posts: 243
Loc: Rennes, France
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Reiner, I'm not the discoverer, but the subject pop up on a french forum and nobody found a solution. So I ask here.
And yes, looks like a nice NP. Too bad My 14" will certainly never show this one to me. Maybe a challenge for the great dobs ?
Bill thank you for your search and for spending some time on this one.
So awaiting also the Dave's response.
Perhaps somebody'll finally put a name or a definition on this one.
Denis
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Canon 10x42 IS binoculars.
Meade sc 4" on homemade fork equatorial mount.
homemade 10" and 14" dobsonian
Nikon photogear.
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Stefan Rostyne
Pooh-Bah
Reged: 10/19/04
Posts: 1009
Loc: Assenede, Belgium
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If you mean the bubble in the crop attached, then i think it is just an imaging or processing artifact.
Look either like a reflection jumping of an equipment part, or a photoshop dodge with a wrong set feather that was forgotten to remove.
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Stefan Van de Rostijne
4.5" F4.5 newt 5°widefield/finderscope
8" f/5.6 travel dob
old 12.5" F5 dob (used to look better...)
30 cm f/30 Classic Cassegrain (polishing primary)
23" f/4 dob project
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reiner
super member
Reged: 09/28/05
Posts: 100
Loc: Freiburg, Germany
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Hi Stefan,
as mentioned in the discussion of Denis' posting, the same object is on the POSS II blue AND red plates, as you can easily verify.
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Reiner
22" and 14" Dobs on EQ platforms
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Stefan Rostyne
Pooh-Bah
Reged: 10/19/04
Posts: 1009
Loc: Assenede, Belgium
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I can see a dim, blurred 'round' cloud of gas in the POSS plates. Not the sharp bright object that we see presented here. I also see that the dim glow on the POSS plates is on the same location of the sharp ring. Therefore I conclude that it is an imaging artifact. It is dodged too hard without use of a feather.
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Stefan Van de Rostijne
4.5" F4.5 newt 5°widefield/finderscope
8" f/5.6 travel dob
old 12.5" F5 dob (used to look better...)
30 cm f/30 Classic Cassegrain (polishing primary)
23" f/4 dob project
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Denis
sage
Reged: 12/24/05
Posts: 243
Loc: Rennes, France
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When searching you can find it on many other pictures at different levels.
And somebody just post this link on the french forum :
http://www.lostvalleyobservatory.com/review.nebula1/
This one won't be a french discovery 
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Canon 10x42 IS binoculars.
Meade sc 4" on homemade fork equatorial mount.
homemade 10" and 14" dobsonian
Nikon photogear.
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OldDeadOne
Pooh-Bah
Reged: 09/09/06
Posts: 1143
Loc: West Virginia
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I bet it's too dim for me to view with my 10" then lol?
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Bert O'Dell
PROUD GOTO USER
LX200 10" Classic
various meade plossi's eyepieces
Konig MX70 40mm" eyepiece
11mm T6
7mm T1
Insane under a full moon
I duck from Iron Skillets
Charleston WV clearsky
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GlennLeDrew
Pooh-Bah
Reged: 06/18/08
Posts: 1293
Loc: Ottawa, Ontario, Canada
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This ring looks exactly like an internal reflection of a bright off-axis star. If the full plate could be seen, the star causing this (gamma Cyg, perhaps?) would be located pretty much exactly an equal distance from, and opposite the optical axis.
This is a common fault of Schmidt cameras. The cause: a bright star's image is focused on the photographic plate. The light from this bright spot is collimated by the primary, the (almost) parallel bundle then being reflected up to the Schmidt corrector plate, some of which is thence sent back down to the primary and imaged on the opposite of the plate. The ring shape is most likely the result of the strong spherical aberration introduced by the primary after *two* reflections.
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Home-made Mk II RA bino, using interchangeable objectives and eyepieces
My Gallery
Mediocre minds discuss people. Good minds discuss events. Great minds discuss ideas.
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reiner
super member
Reged: 09/28/05
Posts: 100
Loc: Freiburg, Germany
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Glenn,
the object is on POSS plates with different pointing (POSS I and POSS II) and it is also there on photographs taken with other telescopes that do not produce the Schmidt ghosts.
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Reiner
22" and 14" Dobs on EQ platforms
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Denis
sage
Reged: 12/24/05
Posts: 243
Loc: Rennes, France
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Glenn, you should give a look at the link I posted higher :
http://www.lostvalleyobservatory.com/review.nebula1/
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Canon 10x42 IS binoculars.
Meade sc 4" on homemade fork equatorial mount.
homemade 10" and 14" dobsonian
Nikon photogear.
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GlennLeDrew
Pooh-Bah
Reged: 06/18/08
Posts: 1293
Loc: Ottawa, Ontario, Canada
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Ahhh.. In my haste I'd assumed the full frame image linked to in the first post above was a digitized POSS frame. That's why I went on with all that blather about Schmidt ghosts. It sure looks similar in form. I checked out the web page outlining the "detective" work undertaken on this. Well done!
This object is simply astonishing! Even the most perfectly symmetrical Abell planetaries don't possess this kind of hard, geometric precision. The sharpness of both the outer and inner edges of the annulus, and the evenness of illumination boggles my mind. I just can't imagine any natural phenomenon that could take on this form.
Just to be really certain that it's truly not an artifact, have one or more follow up images been taken, with at least a slightly different telescope pointing?
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Home-made Mk II RA bino, using interchangeable objectives and eyepieces
My Gallery
Mediocre minds discuss people. Good minds discuss events. Great minds discuss ideas.
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Out of Focus
sage
Reged: 09/23/07
Posts: 232
Loc: Roseville (Sac) CA
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It seems to be some kind of giant force field.
Seriously, it MUST be a photographic artifact. I agree with GlennLeDrew "This object is simply astonishing! Even the most perfectly symmetrical Abell planetaries don't possess this kind of hard, geometric precision. The sharpness of both the outer and inner edges of the annulus, and the evenness of illumination boggles my mind. I just can't imagine any natural phenomenon that could take on this form.
"
BTW the photo with the green coloring is now my desktop background. 
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Orion XT10i w/FT
Orion XT6
Orion Mini Giant 15X63
Orion ST80-A
24mmHyperion,13mmEthos,
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AO series 160 &
L10 Microscopes
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Blue Canyon, Placer Co. CA
 
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Denis
sage
Reged: 12/24/05
Posts: 243
Loc: Rennes, France
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Between differents sources, we have now seen this one on 8 to 10 different pictures, taken by different operators and different gears.
I'm sure the artefact can now be eliminate.
Observing yesterday with my 14" I easily spotted the triangle of star marking the centre of the annealled structure but nothing to see with OIII or uhcs.
The size is relatively consequent.
Perahps/certainly a challenge for the 24" or more, with the good filter
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Canon 10x42 IS binoculars.
Meade sc 4" on homemade fork equatorial mount.
homemade 10" and 14" dobsonian
Nikon photogear.
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tatarjj
Pooh-Bah
Reged: 04/20/04
Posts: 1134
Loc: Austin, TX
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Quote:
It seems to be some kind of giant force field.
Seriously, it MUST be a photographic artifact. I agree with GlennLeDrew "This object is simply astonishing! Even the most perfectly symmetrical Abell planetaries don't possess this kind of hard, geometric precision. The sharpness of both the outer and inner edges of the annulus, and the evenness of illumination boggles my mind. I just can't imagine any natural phenomenon that could take on this form.
"
BTW the photo with the green coloring is now my desktop background.
Nope, this is a real object. I just loaded the POSS plates myself and it's there. It's a real object, and quite possibly a brand new discovery. This is an amazingly symetrical object, but if you look at the images, you'll see it's not perfect, and if it is more symetrical than Abell 39, then it's not by much. If this object is not a planetary nebula, I'll eat my telescope.
You guys need to contact the professionals if you cannot find a designation for it. I can't find one after checking SIMBAD or Megastar.
Here is a 10'x10' POSSII Red image I heavily enhanced in ImageJ.
It looks like this probable PN is about 3'-4' across- pretty darn big! I had to heavily compress this into an especially compressed .jpeg to get it under 100kb though 
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John T.
Austin, TX
25" f/4.2 Dob
18" Obsession #701
4" Stellar Vue Achromat
8X56 Binos
Edited by tatarjj (09/04/08 06:14 PM)
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