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Sharpless 188 in Cassiopeia



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: +5822'01"


All images and content remain the property of Jim Thommes - copyright 2003 - 2017 copyright 2003 - 2012

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