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06-January-2008, 03:49 PM
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M 76 - 9"f/9
hi my friends,
it's been a while since my last post. weather was nasty for more than 2 months. but - everything ends and so does bad weather... I started M76 in an almost perfect night! 1.11.07 - we had terrific seeing and transpareny. (8)-9/10 ! but that night moon came up high in the sky so I had to stop after 2 hours - it was just too bright. then of course - I had to wait a little ... and on friday last week I was able to complete the session with 5.5 more hours of exp time. single frames 10 minutes and 15 minutes. scope: 9" f/9 TMB Apo CCD: SXVF M25C one shot color image acquisition, autoguiding preprocesing astroart4. also CCD sharp and registax for preprocessing. postprocessing (incuding pseudoluminance) in PS CS2 and Pix Insight LE. here we are with a small preview:  FULL size: http://www.stargazer-observatory.com/M76-full.html make sure to check out his enlarged crop HERE: http://www.stargazer-observatory.com/M76-ecrop.html this little nebula holds only some 61 ar seconds in its longitudinal axis and therefore is a "hard nut" in terms of resolution and detail. I am really very glad with that result, as the central appears to be a little elongated and one could get the idea, it has two parts...(only visible in the enlarged crop)well, I admit - this is personal bias here... also the small stargroup was a specific target and I am happy, the 9" apo split this group. looking forward for your comments and tips, guys! Last edited by stargazer_7000; 06-January-2008 at 06:06 PM.. 
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06-January-2008, 04:14 PM
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Nice image, good composition and sizing of the neb too.
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07-January-2008, 02:01 PM
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Hi Diets and what a way to start the new year!, Simply beautiful Lots of details amazingly lots of cloud structure for not using Ha filter due to the one shot. Clear Skies
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07-January-2008, 02:26 PM
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...thanks guys!
FYI: I just goolged around for some data on the central star. well, certainly the central star is solitude, a very hot star of some kKelvin (differing data on that between 15k to 60k)...? the yellowish "binary-component" to the south is a star far out in the background - it is said to be located some 20k LY behind the nebula. HST has revealed this to be certain... so this optical binary system has a distance of some 1.4". did you know this PN (the faintets of all Messier objects) was long time believed to be a galaxy until precise spectroscopic investigations from the early 19th century revealed its true nature? the PN is said to be seen from an edge on view - the "barr" or "cork" like brighter part is said to be a kind of ring-like structure - consisting of the material the very hot CS blows out. this brigther part holds approx. 1 arc min in longitud. axis. however the fainter outer parts - the wings of the "butterfly" measure approx. double size. and further out there are remnants from the periode when the CS dwelled in its "super-giant" phase, commencing to evaporate outer star-mass. it has some diameter of approx. 4-5 arc minutes.
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09-January-2008, 12:39 AM
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thanks again Efrain, thanks Veeger!
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09-January-2008, 02:16 AM
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Hi Dietmar.
Your photos are great. Thanks for the moments in time. Clear skies to you.
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11-January-2008, 08:17 AM
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thanks Paul and Matt!
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