Sh2-224 - supernova remnant in Auriga

  Size: 2000 px      
© Velimir Popov & Emil Ivanov 2019

Sh2-224 is a supernova remnant visible in the constellation of Auriga. It is situated 3.5 ° to SSE of the bright star Capella, the dominant star of the constellation. It is formed by two soft nebulous filaments, the most conspicuous of which is that of the northwest and extends for 20 'x 30' towards the center of the source of radio waves, which has dimensions of 70 'x 75'. The object has an unusual shape, with a shell structure with a radius of about 25 parsec, and is in interaction with a cavity of the interstellar medium at a higher temperature than the surrounding environment, located in the south-western part and of the arch. This conformation suggests that the rest of the supernova in the southwest direction has come into contact with the cavity, first deforming and entering into interaction with this structure, then expanding inside it and creating a wider propagation wave that has emerged from the opposite part, thus creating the arch structure visible in the westernmost part, ie beyond the cavity. The distance of the structure is estimated at about 14,700 light years from the solar system, in a peripheral region of the Arm of Perseus. The X-ray study determined an age of the structure between 13,000 and 24,000 years.

Image details:


Center of field RA 05:27:02 (h:m:s)
Center of field DE +42:59:37 (deg:m:s)
Size 1.78 x 1.19 (deg)
Pixel scale: 2.99 (arcsec/pixel)
Orientation: Up is 75.9 degrees E of N
Charts and image details obtained from
Optic(s): ASA 12" Astrograph @ f/3.6 (Newton)
Mount: ASA DDM85 Standard
Camera: SBIG STL 11000 M
Filters: Luminance, Red, Green, Blue, Astronomik filters
Dates/Times: January - March 2017
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:6x10 min,R:6x10 min, G:6x10 min, B:6x10 min, Ha:12x15 min, Oiii:12x15minBin 2, Total Exposure Time - 600 min. (10:00 hrs.)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013 - 2019. All Rights Reserved
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