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vdB 65

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#1 Rick J

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Posted 24 May 2016 - 02:29 PM

The mostly reflection nebula vdB 65 is located in southern Auriga northeast of the more famous Sh2-241.  I couldn't fit both into the same field of view.  I took it separately and will process it next.  I found only one distance estimate that puts it about 3600 light-years distant.  I doubt the two are related as what few distance estimates I found for Sh2-241 put it some 4 times further away.

While vdB 65 is listed as a reflection nebula it seems to have some red hydrogen emission involved.  It is strongest near the northeastern edge but I also see some near the core making the core of the nebula more yellow than I'd expect for a blue reflection nebula.

It appears to be an illuminated part of a much larger dust cloud that extends mostly to the southwest as Dobashi 4516 and 4517.

Three asteroids are in the image.  Thanks to better than normal (for the last few months at least) one was a faint magnitude 20.9 per the Minor Planet Center.  See the annotated image for details.

While seeing and transparency were better this night than I've had in months clouds were a problem.  The luminance trails of the asteroids show a break when clouds pretty much blocked the view for the last two minutes of the second frame and first two minutes of the third.  Later the blue frames were hit by clouds as well.  To compensate I took three blue frames to try and increase the signal to noise ratio of the blue channel so it better matched the red and green frames.

This was my first March image.  I can't recall if things went better that month but do see more images than in February so that's a good sign.

14" LX200R @ f/10, L=4x10' RG=2x10' B=3x10', STL-11000XM, Paramount ME

 

Full image at 1" per pixel

 

Annotated at 1.5" per pixel

 

Attached cropped image also at 1.5" per pixel

 

 

Rick

Attached Thumbnails

  • VDB65L4X10RG2X10B3X10-67CROP.JPG


#2 Jim Thommes

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Posted 24 May 2016 - 11:50 PM

Rick,

This loos like a really nice composition. You can certainly see the larger cloud structure. It does look like there is some emission. Is this LRGB only, or did you shoot any H-Alpha?



#3 Rick J

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Posted 25 May 2016 - 02:35 AM

Pure LRGB as in the info line.  I didn't expect the red so didn't take any Ha.  To late three months later.  That will have to wait until next year.  More time should help the dark nebulae to stand out. 

 

Rick


Edited by Rick J, 25 May 2016 - 02:36 AM.


#4 Cristina Cellini

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Posted 25 May 2016 - 04:34 AM

Very nice image! I did not know this object.

 

Cristina



#5 polare70

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Posted 25 May 2016 - 09:34 AM

Nice image Rick !




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