Hemisphere:  Northern
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A fisherman with a hat (sh2-224), 



    
        

            Wei Li
A fisherman with a hat (sh2-224)
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A fisherman with a hat (sh2-224)

Technical card

Imaging telescopes or lenses: TEC 140 APO ED

Imaging cameras: Moravian Instruments G3 16200

Mounts: Astro-Physics Mach1AP GTO

Guiding telescopes or lenses: TEC 140 APO ED

Guiding cameras: ZWO ASI 120 mini

Software: PixInsight PI 1.8  ·  AstroPixel Processor  ·  SGPro v3

Filters: Chroma 2" LRGB  ·  Chroma 2" O3 3nm  ·  Chroma 2" Sii 3nm  ·  Chroma 2" Ha 5nm

Accessory: Feathertouch Starlight Instruments EFS  ·  AP GTX Field Flattener


Dates:Dec. 18, 2020

Frames: 74x1800"

Integration: 37.0 hours

Avg. Moon age: 4.08 days

Avg. Moon phase: 17.66%


Basic astrometry details

Astrometry.net job: 4111570

RA center: 5h 26' 31"

DEC center: +42° 55' 4"

Pixel scale: 3.298 arcsec/pixel

Orientation: 136.275 degrees

Field radius: 0.937 degrees


Resolution: 1600x1275

Locations: backyard, Grapevine, TX, United States

Data source: Backyard

Description

Another faint object, fortunately it is not as faint as HFG1. From official description:
"Sh2 -224 is a supernova remnant visible in the northern constellation of Auriga .

3.5 ° a SSE of the bright star Capella , the dominant star of the constellation, is identified ; it is formed by two tenuous nebulous filaments, the most conspicuous of which is the northwest one and extends for 20 'x 30' towards the center of the radio wave source , which has dimensions of 70 'x 75'. [4] Being at a moderately northern declination , its observation is easy especially in the regions of the northern hemisphere , where it is visible high in the sky for most nights of the year.

The object has an unusual shape, with a shell structure with a radius equal to about 25 parsecs , and is in interaction with a cavity of the interstellar medium at a higher temperature than the surrounding environment, located in the southwestern part and shaped like a bow; this conformation suggests that the southwestern supernova remnant made contact with the cavity, first deforming and interacting with this structure, then expanding within it and creating a larger propagation wave that emerged from the side opposite, thus creating the arched structure visible in the westernmost part, ie beyond the cavity. [5] [6] The distance to the structure is estimated at 14700light years from the solar system , [2] in a peripheral region of the Arm of Perseus . An age of the structure between 13,000 and 24,000 years was determined through the X-ray study . "

I kept looking at it, it was like a fisherman with a hat, pretty typical in asia countries.

Nights:
12/8/2020,12/9/2020, 12/11/2020, 12/14/2020, 12/16/2020, 12/18/2020

Subs:
HA: 26x1800s
O3: 42x1800s
R/G/B: 30x120s each

Comments

Author

weili616
Wei Li
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A fisherman with a hat (sh2-224), 



    
        

            Wei Li