Sharpless 188 in Cassiopeia
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ON IMAGE FOR FULL SIZE VIEW (2800x2100)
Scope:
Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: Pine Creek, CA,
1 October 2016
Camera: ST8300M (Baader Ha LRGB filters) Exposure:
Exposure: 12 x 6 min
(1x1 bin) exposure with IR/UV Block filter, 14 x 12 min (1x1 bin) exposure
with H-Alpha filter, 8 x 4 min (2x2 bin) RGB exposures. Processing: Data
Collection - Sequence Generator Pro (as FITs). Calibrated, stacked
(Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration,
equalization, and gradient removal - Astroart. Curves, Levels, RGB
combine - ImagesPlus. Luminance Layering, final stretch, and finishing -
Photoshop. RGB calibration - eXcalibrator. This image is a RGB combine
with Luminance layering. Color saturation in LAB color. The H-Alpha
filter exposure was screen blended into the IR/UV Blocking filter exposure stack
and used for the
luminance layer. Images processed at 3352 x 2532 resolution. Final Image size is approximately
2800 x 2100. North is up in this image.
The central attraction in this image is the Planetary Nebula known as Sharpless
188 - it is also Known as LBN 633. This nebula was earlier in consideration as a
possible supernova remnant, however a 1984 radio emission study by C. J. Salter
et al. where the data effectively ruled out a supernova. The study placed the
planetary nova expansion age at about 7,500 years and the distance at
about 710 light years. The object has been nicknamed in recent times as
the "Firefox Nebula" due to its likeness to the browser logo. There
are a few background galaxies in this field as well. These objects are identified in the
annotated
image. . Horizontal FOV is 85' Image center is located approximately - Equatorial 2000: RA: 01h 30m 38.6s Dec: +58°22'01"
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