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6/04/2012

Suggested Planetary Nebula for Summer to observe

Spring has an abundance of galaxies, and next week I'll be hunting a few last ones down early in the evening.  However, then comes summer and I have completed all of the summer Herschel 400 and will work on the Herschel 400 II.  I am also going to combine this work with some other favorite objects I like and one of my most favorite type of objects to hunt down are planetary nebula.  I am hoping to have the Zambuto mirror in the 14 by then.  Yep, I still am waiting for it.  It is at Nova Optical and Steve Dodds needed to do some maintenance on his chamber so I have a few more days to wait (which is just fine as I have been swamped with family and my son's graduation).

So I thought I would post some of the planetary nebula that I am going to either hunt or re-hunt down and a finder chart for them.  If you want to see the finders or images in a larger frame, click on them and then you can navigate them in a larger format.

1. IC 4593 in Hercules.  RA 16 11 45;  Dec: +12 04 17; Size: 15 x 11; PN Mag: 11.4; Central Star Mag. 11.2. 



Here is a finder chart:






Here is an image: 








2. NGC 6210 in Hercules.  RA 16:44:30  Dec. +23:48  Size: 20x13;  PN Mag. 9.7; Central Star Mag. 12.2. 

Here is the finder (it is the lower part of Hercules): 







Here is an image: 




Takes magnification very well, gives a blue color and two envelopes in larger scopes can be seen.  




3. NGC 6302 The Bug Nebula in Scorpius; RA: 17:13:44;  Dec. -37.06.14; Size: 83' X 24';  PN Mag. 12.9; Central Star Mag: ? 


Here is the finder chart (and the finder for the next PN, NGC 6337)







The image: 











4.  NGC 6337  in Scorpius;  RA: 17:22:15;  Dec: -38: 29: 01;  Size: 49' x 45'; PN Mag: 12.0; Central Star Mag: 12.0. Very faint, ring like outer structure with items visible in the central region including two stars.  Nice one to up the magnification on.




Finder chart: 


















Image: 






















5. NGC 6445 The Little Box Nebula in Sagittarius:  RA: 17:49:15.1;  Dec. -20:00:34;  Size: 38' x 29';  PN Mag. 13.2; Mag Central Star: 19.1;  


Great surface brightness and at high magnification offers wonderful views and structure. 




Finder chart: 














Image: 












6. NGC 6369 in Ophiuchus; RA 17:29:21; Dec. -23:45:35;  Size: 38; PN Mag: 12.9; PN Central Star: 16.0;  

Takes magnification well at around 500x will be quite annular in appearance.  



Finder chart: 





















Image: 



















7. NGC 6629 in Sagittarius;  RA: 18:25:43;  Dec. -23 12 10;  Size: 16' x 14';  PN Mag: 11.6; PN Central Star: 13;  


Central star is easy to see in this small but bright planetary nebula.  Bright, high surface brightness with a sharp edge.  






Finder chart: 




















Image: 


















8. NGC 6543 Cat's Eye Nebula;  RA 17:58:33;  Dec. +66:37:59;  Size: 23' x 18';  PN Mag. 8.8; Central Star 10.9; 


With a larger scope you can see the two shells that surround the central star which is also visible. Some filament structure can also be seen in larger scopes.  Great Target to take magnification up on to see the details. 






Finder chart: 













Image: 



















9.  NGC 6818 in Sagittarius, The Little Gem Nebula;  RA 19:43:58;  Dec. -14:09:11;  Size: 22' x 15';  PN Mag: 10.0; Central Star: 16.9; 

Very bright, very blue in color with a high surface brightness so high magnification is really useful here and allowed.  PN should be brighter on the eastern end and may appear annular ans somewhat elongated also.  As shown in the finder image Barnard's Galaxy is right below and is a good challenge in a dark sky for a visual observer to see. 



Finder chart: 









 Image: 













 10.  NGC 6826 The Blinking Nebula in Cygnus:  RA 19:44:48;  Dec. +50:31:30;  Size: 27' x 24'; PN mag. 9.8; Central Star: 10.6; 


If you have a smaller aperture scope you can get this object to blink for you with averted vision and with a filter.  If you use a large aperture instrument then you won't get the blinking affect but you will have a wonderful view of the structure and of the central star and of a dark region near the central star.  Fun object and I haven't been here in a couple of years. 




Finder: 


















 11.  NGC 6891 in Delphinus;  RA: 20:15:09;  Dec. +12:42:15;  Size: 12'; PN Mag. 11.4; Central Star Mag. 11.1; 


This one is a chase to get to as it is out there by itself.  Bring on the magnification between 400x and 500x and you'll see the central star, the outer and inner halo.  Bluish in color and small.  Fun though if you play with it and study it.  






Finder 









 Image: 










 12.  NGC 6905 The Blue Flash Nebula;  RA: 20:22:23;  Dec. +20:06:16;  Size: 44' x 37';  PN Mag. 11.9; Central Star Mag. 14.2;  


Best way to get here is from the end of Sagitta and on the way you'll pass a small PN which is NGC 6886 so you can bag that if you want. 


NGC 6905 takes some work to get to star hopping but it is worth it.  It is one of my favorite summer objects NGC 6905 is stunning.  It is small in size but just delightful.  Central Star is easily seen as in structure around the central star including a dark area.  See this one if you haven't.  






























There are actually many other planetary nebula that you and I can view and they can be found at this link.  I've listed some here I've seen before and for these, its been between two and four years since I've seen them and I look forward to visiting, observing and sketching these old friends.  Now, I have colored oil pastels but I need to pick up some colored chalk pastels to add a touch of color to the ones that I can see color in.