Imaging telescope or lens: Orion EON 130mm ED Triplet APO
Imaging camera: ZWO ASI1600MM-Cool
Mount: Astro-Physics Mach1GTO
Guiding telescope or lens: Orion 60mm Guidescope
Guiding camera: Orion StarShoot AutoGuider Pro Mono
Focal reducer: Orion 3" Field Flattener
Accessory: ZWO EFW
Dates: Sept. 1, 2016
Integration: 3.6 hours
Avg. Moon age: 29.17 days
Avg. Moon phase: 0.15%
Astrometry.net job: 1654270
RA center: 299.898 degrees
DEC center: 22.715 degrees
Pixel scale: 0.424 arcsec/pixel
Orientation: 157.632 degrees
Field radius: 0.379 degrees
Locations: Home, Onalaska, Texas, United States
The naming of this planetary nebula goes back to the English astronomer John Herschel, who described M27 as a “nebula shaped like a dumb-bell, with the elliptic outline completed by a feeble nebulous light”. Growing up, the word "dumbbell" never conjured up a positive image for me. So I prefer to refer to this sky object by its alternate name, the Apple Core Nebula. It's also called the Diablo Nebula, but I don't know the origin of that name. This object consists of gas that has been ejected from the hot central star, a white dwarf, in its last stage of life. This white dwarf star, barely visible at the center of the image, is thought to be larger than any other known white dwarf in our sky. The gas atoms in the nebula are excited (heated) by the intense ultraviolet radiation from this star and emit strongly at specific wavelengths. This image was taken using hydrogen, oxygen, and sulfur narrowband filters and assigning each of the three elements to a red/blue/green color channel. Many unsolved mysteries remain about these sky objects, including the physical mechanism which is able to expel the low-mass star's gaseous outer-envelope, leaving a hot white dwarf. The Dumbbell Nebula is more than 100 times more luminous than our Sun, while the central dwarf star has only about a third of the Sun’s luminosity. The nebula is brighter than the star itself because the star mainly emits in the non-visible part of the spectrum and then the nebula absorbs the radiation and emits much of it in visible light.
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