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Jon Greif

Location of Photo:

Alpine, CA, USA

Date/Time of photo:

October 7, 2023, between 8 pm and 3 am PDT


Takahashi Mewlon 210 mm reflector, ZWO 2600 MM Pro camera, ZWO SHO NB filters, Pegasus Astro NYX-101 mount, Williams Optics 50 mm Guidescope, ZWO 174 MM guide camera, Pixinsight processing.


A few days ago, I posted an image of the planetary nebula, M57 - The Ring Nebula, as seen through the visible spectrum of light (red/blue/green) -- what is known as "broadband." The following night, I imaged the same structure with narrow band filters, coloring it in what is known as "Hubble Palette" -- assigning Sulfur gas to the red spectrum, Hydrogen gas to the green spectrum and Oxygen gas to the blue spectrum. Narrow band filters allow for much greater detail (though the colors may be a little "off-putting)." Click on the image and then enlarge it and you'll see the greater detail of the expanding gases, including gases that have escaped what appears to be the solid border.