Sh2-261 in Orion


12" ASA - LRGB

12" ASA - annotated

12" ASA - Ha

    Size: 2000 px Size: 2000 px Size: 2000 px  
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© Velimir Popov & Emil Ivanov 2014

Sh 2-231, Sh 2-232,Sh 2-233 and Sh 2-235 form a complex of HII regions located together in the Perseus arm in the outer galaxy and visible in the direction of the constellation Auriga. This complex may be associated with an old (330 thousand years) supernova remnant, FVW 172.8+1.5. Some astronomers combine Sh 2-231 and Sh 2-233 (see the reference map) into a single star formation region, 173.37+2.55, that contains 7 masers and numerous young stellar objects.

Image details:


Center of field RA 05:41:46 (h:m:s)
Center of field DE +36:11:41 (deg:m:s)
Size 1.59 x 1.15 (deg)
Pixel scale: 1.8 (arcsec/pixel)
Orientation: Up is -72.6 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: Ha, Red, Green, Blue, Astronomik filters
Dates/Times: 14, 15 December 2014
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: Ha:23x15 min; R:9x10 min, G:9x10 min, B:9x10 min Bin 1, Total 615 min (10:15 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2014. All Rights Reserved
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