Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  IC 4278  ·  M 51  ·  NGC 5194  ·  NGC 5195  ·  Whirlpool galaxy
Getting plate-solving status, please wait...
M51... A Detailed Whirlpool, 



    
        

            John Hayes
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M51... A Detailed Whirlpool

Getting plate-solving status, please wait...
M51... A Detailed Whirlpool, 



    
        

            John Hayes
Powered byPixInsight

M51... A Detailed Whirlpool

Imaging telescopes or lenses: Celestron C14 EDGE HD

Imaging cameras: FLI MicroLine 16803

Mounts: Astro-Physics AP 1600

Guiding cameras: ZWO ASI 1600MM cool

Software: PixInsight  ·  Optec FocusLock (for ONAG)  ·  Adobe Photoshop CC (64 Bit)  ·  Cyanogen MaxIm DL Pro 6

Filters: Astrodon G Tru-Balance E-Series Gen 2  ·  Astrodon L Gen.2 E-series  ·  Astrodon Red Tru-Balance E-Series Gen 2  ·  Astrodon Ha, 5nm

Accessory: Starlight Instruments Focus Boss Sytstem  ·  Innovations Foresight On-axis guider XT


Dates:May 9, 2017May 20, 2017May 21, 2017May 22, 2017

Frames:
12x1200" (4h) -25C
Astrodon G Tru-Balance E-Series Gen 2: 6x1200" (2h) -25C
Astrodon Ha, 5nm: 11x1200" (3h 40') -25C bin 1x1
Astrodon L Gen.2 E-series: 19x1200" (6h 20') -25C

Integration: 16h

Darks: 12

Flats: 12

Bias: 20

Avg. Moon age: 21.87 days

Avg. Moon phase: 43.27%

Mean SQM: 4.60

Mean FWHM: 1.74

Temperature: 11.40


RA center: 13h29m51s.542

DEC center: +47°1126.62

Pixel scale: 0.475 arcsec/pixel

Orientation: -2.814 degrees

Field radius: 0.341 degrees

More info:Open 


Resolution: 3651x3651

Locations: Fly By Night Observatory, Bend, Oregon, United States

Description

Even though images of M51 are a dime a dozen, the Whirlpool remains one of my favorite galaxies because it is so large, detailed, and colorful. This image started out as a test of my newly tuned up and reconfigured C14 Edge based telescope system. I've been slowly improving both the optical system, the OTA, and the mount control system, which will soon be moved to a remote location. What started out as a test soon became a full blown project as our central Oregon skies finally cleared after a long and VERY cloudy winter. The Rayleigh criterion for the resolution of a 14" telescope is about .4 arc-sec, although as we all know, seeing greatly reduces that number for long exposure imaging. After tuning the wavefront of the telescope, I was curious to see if I could gather data good enough to extract information down to about 1 arc-second. The luminous subs in this data had an average FWHM about 1.8 arc-sec and after performing deconvolution on the data, the stacked result shows stars at about 1.1 arc-seconds FWHM. Even though this image is within a factor of two of the limiting resolution of a theoretical 14" system, seeing effects still render the smallest details unrecoverable. At a distance of about 23 mly, this image shows features down to about 100 - 150 ly across. It is cool to see that even "small" amateur telescopes like the C14 can produce images of stars in other Galaxies!

Be sure to check out the full screen image--there's a lot going on in it. As always, C&C is welcome.

John

PS I uploaded two different crops of the full image. The tight crop holds it's own to a full screen display but I also enjoy seeing the galaxy floating with more space around it (as shown in the wider field crop.) Feel free to tell me which works better for you...

PPS Rev D is reprocessed to reduce a Deconv error in the original processing. The Ha data gave me fits the first time around and I just couldn't get it right so I left it out in this version. That rebalances the color a bit. I'll have to fool around with adding Ha in the future. Hopefully it looks a bit better up close to you guys. I think that overall the processing came out a bit cleaner.

Comments

Revisions

    M51... A Detailed Whirlpool, 



    
        

            John Hayes
    Original
    M51... A Detailed Whirlpool, 



    
        

            John Hayes
    B
    M51... A Detailed Whirlpool, 



    
        

            John Hayes
    C
    M51... A Detailed Whirlpool, 



    
        

            John Hayes
    D
    M51... A Detailed Whirlpool, 



    
        

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    E
  • Final
    M51... A Detailed Whirlpool, 



    
        

            John Hayes
    F

B

Description: Tight Crop of Full Field

Uploaded: ...

C

Description: Wide crop with slightly enhanced structure

Uploaded: ...

D

Description: Reprocessed to reduce sharpening problems - Ha removed.

Uploaded: ...

E

Description: Blue Saturation Decreased Slightly

Uploaded: ...

F

Description: Ha added

Uploaded: ...

Sky plot

Sky plot

Histogram

M51... A Detailed Whirlpool, 



    
        

            John Hayes

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