Hemisphere:  Northern  ·  Constellation: Taurus (Tau)
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Spaghetti Nebula (Sh2-240, Simeis 147, SNR G180. 0-01.7), 



    
        

            Gary Lopez
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Spaghetti Nebula (Sh2-240, Simeis 147, SNR G180. 0-01.7)

Imaging telescopes or lenses: William Optics GT71 71mm f/5.9 Apo Refractor

Imaging cameras: ZWO ASI1600MM Cooled PRO

Mounts: Orion Atlas EQ-G

Guiding telescopes or lenses: Orion 50mm Guide Scope with helical focusing

Guiding cameras: Lacerta M-Gen II Autoguider

Focal reducers: William Optics 0.8X Field Flattener

Software: Adobe Lightroom CC  ·  Photoshop CC  ·  Main Sequence Software Sequence Generator Pro, v3.0  ·  Pleaides PixInsight Core 1.8

Filters: Astrodon R Gen 2 E-series 31mm  ·  Astrodon G Gen 2 E-series 31mm  ·  Astrodon B Gen 2 E-series 31mm  ·  Astrodon Ha 3nm-31mm


Dates:Nov. 25, 2019Dec. 27, 2019Dec. 30, 2019

Frames:
Astrodon B Gen 2 E-series 31mm: 30x30" (gain: 300.00) -15C bin 1x1
Astrodon G Gen 2 E-series 31mm: 30x30" (gain: 300.00) -15C bin 1x1
Astrodon Ha 3nm-31mm: 241x300" (gain: 300.00) -15C bin 1x1
Astrodon R Gen 2 E-series 31mm: 30x30" (gain: 300.00) -15C bin 1x1

Integration: 20.8 hours

Darks: ~30

Bias: ~50

Avg. Moon age: 11.22 days

Avg. Moon phase: 7.09%

Bortle Dark-Sky Scale: 4.00


Astrometry.net job: 3729611

RA center: 5h 39' 54"

DEC center: +26° 54' 30"

Pixel scale: 2.304 arcsec/pixel

Orientation: 154.886 degrees

Field radius: 1.346 degrees


Resolution: 3369x2527

Locations: Monterey Pines Observatory, Monterey, California, United States

Data source: Backyard

Description

Sharpless 2-240, known as the Spaghetti Nebula, is a large supernova remnant straddling the border between the constellations Auriga and Taurus. The glowing gas filaments cover nearly 3 degrees of the sky, a cloud of stellar debris that is about 150 light years across. The explosion occurred about 40,000 years ago, the light reaching Earth a few thousand years later. A spinning neutron star or pulsar is all that remains of the original star’s core.

This HaRGB image is a complete reprocessing of data that were collected in Winter 2019 (yes, it is still cloudy here in Monterey, CA). In my last effort with these data I was able to reveal good detail in the glowing hydrogen filaments of this SNR, but I struggled to control the noise that occupied the space between the filaments, in part challenged by the very low brightness of this object and the abundance of small star. This time I developed a nearly noise-free luminance layer using more than 20 hours of very low HFR Ha data by doing a series of light MultiscaleMedian and MultiscaleLinear Transforms coupled with low-iteration Deconvolution steps, both in the linear and non-linear states. One of the keys to this technique was developing capable star masks for the myriad of tiny stars that clog the image. The approach allowed the removal of most of the stubborn, interstitial noise, while not noticeably degrading the resolution and detail of the filaments. What do you think?

Comments

Revisions

    Spaghetti Nebula (Sh2-240, Simeis 147, SNR G180. 0-01.7), 



    
        

            Gary Lopez
    Original
  • Final
    Spaghetti Nebula (Sh2-240, Simeis 147, SNR G180. 0-01.7), 



    
        

            Gary Lopez
    B

B

Description: Tweaked contrast in isolated regions to improve structural detail of Ha filaments.

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Spaghetti Nebula (Sh2-240, Simeis 147, SNR G180. 0-01.7), 



    
        

            Gary Lopez