S H A R P L E S S     E M I S S I O N     N e b u l a


SH2-105,     (NGC6888)


        created: 07-10-2020.         revised: 10-20-2020.

Hello!


Gaseous/Diffuse Nebula are clouds of interstellar matter, thin but widespread agglomerations of gas and dust. If they are large and massive enough they are frequently places of star formation, thus generating new associations or clusters of stars.

Some of the stars near nebulae are often very massive and so hot that their high-energy radiation can excite the gas of the nebula to shine; such nebula are called emission nebula. If the stars are not hot enough, their light is reflected by the dust and can be seen as white or bluish reflection nebula. These areas of active star formation are called HII regions. The HII refers to the ionized molecular hydrogen in which the region is embedded.

How do Gaseous/Diffuse Nebula form? Nebulae originate from large cosmic primordial clouds of gaseous matter in our Universe, leftover from its formation. Or they can come from enriched material ejected into interstellar space during the later life stages of the more massive stars in a galaxy. On cosmic timescales, nebulae undergo rapid changes and have only comparatively short lifetimes, so that those we observe are all young objects.

Nebulae are scattered throughout the universe. Most of the nebulae that we can visually observe are located within our own Milky-Way galaxy. But nebulae have also been discovered in other galaxies, and mark areas of starbirth among their spiral arms.



American astrophysicist Stewart Sharpless, (1927 - 2013), graduated with a BS from Antioch University, and in the early 1950's worked as a graduate student at Yerkes Observatory. In 1953, Sharpless became a staff astronomer for the U.S. Naval Observatory at the Flagstaff, Arizona observatory.

While working at the U.S. Naval Observatory, utilizing the new National Geographic - Palomar Sky Survey plates, Sharpless in 1959 published a catalog of 313 HII emission regions. The catalog titled "A Catalogue of HII Regions" is recognized as an excellent compilation of northen celestial HII emission nebula of declination -27 degrees and higher. While some Sharpless objects, designated SH2, are faint and challenging, many are large and bright objects, already recorded in prior catalogs such as Messier and the NGC. The SH2 objects run in size from small planetary nebula up to extensive regions such as the Veil or North American Nebula.

Here's a few interesting links:

Steve Gottlieb's Adventures - Sharpless Nebula:
Harvard Sharpless paper (PDF paper download)
Reiner Vogel Sharpless HII Regions
Dean Salman The Best of the Sharpless Catalog


Below is my personal observation list of the 'Sharpless Nebulas'.

I currently have 31 out of 313 objects visible from my Pittsburgh, PA latitude of around +40.
All of my images were taken using a ZWO "ASI294MC Pro" color CMOS Peliter cooled astronomical camera and Optolong L-eNhance narrowband filter (Ha, Hb, OIII).
Image capture using SharpCap with the "LiveStack" option with each image having minimal processing applied to it.





SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-11 Emission Nebula Scorpius 07/18/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-25 M8 Emission Nebula Sagittarius 06/20/2020 8" SCT @ f6.3 CGEM 4144x2822 30 sec 40 1200 sec L-eNhance yes
       "the Lagoon Nebula (narrowband filter)"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-30 M20 Emission Nebula Sagittarius 06/20/2020 8" SCT @ f6.3 CGEM 4144x2822 30 sec 30 900 sec L-eNhance yes
       "the Triffid Nebula (narrowband filter)"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-45 M17 Emission Nebula Sagittarius 06/12/2020 8" SCT @ f6.3 CGEM 4144x2822 15 sec 60 900 sec L-eNhance yes
       "Swan Nebula (3rd Qtr Moon & narrowband filter)"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 70 55 55 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-49 M16 Emission Nebula Serpens 06/21/2020 8" SCT @ f6.3 CGEM 4144x2822 30 sec 60 1800 sec L-eNhance yes
       "Eagle Nebula (narrowband filter)"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-65 Emission Nebula Aquila 09/08/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 65 70 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-66 Emission Nebula Aquila 09/09/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 65 70 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-84 Emission Nebula Sagitta 07/15/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-86 NGC6820 Emission Nebula Vulpecula 06/29/2020 8" SCT @ f6.3 CGEM 4144x2822 120 sec 30 3600 sec L-eNhance yes
       "SH2-86 (narrowband filter)"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-88 Emission Nebula Vulpecula 07/18/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
<
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-93 Emission Nebula Vulpecula 06/29/2020 8" SCT @ f6.3 CGEM 1280x1024 60 sec 30 1800 sec L-eNhance yes
       "SH2-93 (narrowband filter)"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-95 NGC6842 Planetary Nebula Vulpecula 06/29/2020 8" SCT @ f6.3 CGEM 1280x1024 60 sec 30 1800 sec L-eNhance yes
       "SH2-95 (narrowband filter)"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 70 65 70 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-100 NGC6857 Emission Nebula Vulpecula 06/24/2020 8" SCT @ f6.3 CGEM 1024x786 60 sec 10 600 sec L-eNhance yes
       "SH2-93 (narrowband filter)"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 300 70 60 60 -10 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-101 Emission Nebula Cygnus 07/17/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
1
       "Tulip Nebula"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-103 Veil Nebula Supernova Remnant Cygnus 10/13/2020 60mm f4 refractor Atlas Gem 4144x2822 30 sec 90 2700 sec L-eNhance yes
       "Veil Nebula"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 60 75 65 +3.7 No




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-103 NGC6960 - Veil Supernova Remnant Cygnus 06/21/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 20 1200 sec L-eNhance yes
       "Veil Nebula - Western side"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-103 Pickerings Triangle - Veil Supernova Remnant Cygnus 06/24/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 20 1200 sec L-eNhance yes
       "Veil Nebula - North-Central"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-103 NGC6992 - Veil Supernova Remnant Cygnus 06/21/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 20 1200 sec L-eNhance yes
       "Veil Nebula - Eastern side"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-103 NGC6995 - Veil Supernova Remnant Cygnus 06/21/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 20 1200 sec L-eNhance yes
       "Veil Nebula - Eastern side - Tip"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-104 Emission Nebula Cygnus 09/09/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 65 70 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-105 NGC6888 Emission Nebula Cygnus 06/21/2020 8" SCT @ f6.3 CGEM 4144x2822 120 sec 45 5400 sec L-eNhance yes
       "Crescent Nebula"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-106 Emission Nebula Cygnus 09/09/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 65 70 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-107 Emission Nebula Cygnus 07/11/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 15 900 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-108 IC1318 Emission Nebula Cygnus 10/16/2020 60mm f4 refractor Atlas Gem 4144x2822 180 sec 10 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 65 75 65 -14.8 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-108 IC1318 Emission Nebula Cygnus 09/09/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
       'top left'
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 65 70 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-108 IC1318 Emission Nebula Cygnus 09/09/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
       'top center'
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 65 70 70 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-112 Emission Nebula Cygnus 09/04/2020 8" SCT @ f6.3 CGEM 2072x1410 60 sec 30 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 350 55 55 65 -4.9 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-117 NGC7000 - IC5010 Emission Nebula Cygnus 10/13/2020 60mm f4 refractor Atlas Gem 4144x2822 30 sec 60 1800 sec L-eNhance Yes
       "North American Nebula and Pelican Nebula"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 60 75 65 +3.7 No




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-131 IC1396 Emission Nebula Cygnus 10/16/2020 60mm f4 refractor Atlas Gem 4144x2822 60 sec 45 2700 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 65 75 65 -14.8 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-142 NGC7380 Emission Nebula & Star Cluster Cepheus 06/24/2020 8" SCT @ f6.3 CGEM 4144x2822 30 sec 30 900 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-157 Emission Nebula Cassiopeia 07/17/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
       'main filament'
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-157 Emission Nebula Cassiopeia 07/17/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
       'center patch'
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-158 NGC7538 Emission Nebula Cepheus 07/17/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-159 Emission Nebula Cassiopeia 07/17/2020 8" SCT @ f6.3 CGEM 4144x2822 60 sec 30 1800 sec L-eNhance yes
      
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 -5.3 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-162 NGC7635 Emission Nebula Cassiopeia 06/28/2020 8" SCT @ f6.3 CGEM 4144x2822 120 sec 30 3600 sec L-eNhance yes
       "Bubble Nebula"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 70 65 70 5 Yes




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-190 IC1805 Emission Nebula Cassiopeia 10/07/2020 60mm f4 refractor Atlas Gem 4144x2822 60 sec 20 1200 sec L-eNhance Yes
       "Heart Nebula"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 60 80 65 +8.3 No




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-199 IC1848 Emission Nebula Cassiopeia 10/07/2020 60mm f4 refractor Atlas Gem 4144x2822 60 sec 20 1200 sec L-eNhance Yes
       "Soul Nebula"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 60 80 65 +8.3 No




SH2 Object Type Constellation Date Optical Tube Mount Capture size Exposure Stack# Time Filter Guided
SH2-277 NGC2024 & IC434 Emmision Nebula Orion 10/13/2020 60mm f4 refractor Atlas Gem 4144x2822 30 sec 80 2400 sec L-eNhance yes
       "Flame Nebula and Horsehead Nebula"
Color Space Binning Gain Brightness White Bal (B) White Bal (R) Temperature Dark Frame
RGB24 1 375 60 75 65 +3.3 No




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Hope you enjoyed the visit. Come again soon!
Larry McHenry,   Pittsburgh, PA. USA

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