Sh2-261 in Orion


12" ASA - LRGB

12" ASA - Ha

    Size: 2000 px Size: 2000 px    
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© Velimir Popov & Emil Ivanov 2013

Sh 2-261 is a HII region in the northern part os the constellation Orion, near to the border with Gemini. It is often called Lower's nebula because it appears on a photographic plate taken by the Harold and Charles Lower in 1939. The Lowers were amateur astronomers,telescope makers and pioneering astrophotographers from San Diego, California. This nebula seems to be associated with the O7.5V star HD 41997, which is the brightest bluish star almost in the centre of the image.

Image details:


Center of field RA 06:09:07 (h:m:s)
Center of field DE +15:43:30 (deg:m:s)
Size 73.4 x 56.1 (arcmin)
Pixel scale: 1.8 (arcsec/pixel)
Orientation: Up is -176 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: February 2014
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: Ha:23x15 min; R:6x10 min, G:6x10 min, B:6x10 min Bin 1, Total 525 min (8:45 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013. All Rights Reserved
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