Sh2- 290 (Abel 31) in Cancer

  Size: 1600 px      
© Velimir Popov & Emil Ivanov 2011 - 2017

Sh2-290 (also known as Abell 31, PK 219.1+31.2, A 31 or ARO 135) is a planetary nebula in the constellation Cancer. It is very difficult to be detected about 2.5 degrees at SSE of the open cluster M67; despite its large size (one of the largest planetary nebulae of the sky) it is not as bright, indeed its extent is the cause of its low brightness: it is in fact a very ancient nebula, whose gases have expanded to such an extent that it begins to disperse in the surrounding interstellar medium. The southern part of the cloud is surrounded by a bow shock effect, while the northern part has extremely nuanced limits, a sign that dissolution is already taking place here. All planetary nebulae, over time, will suffer this same fate.

Image details:


Center of field RA 08:54:14 (h:m:s)
Center of field DE +08:57:28 (deg:m:s)
Size 82.8 x 55.2 (arcmin)
Pixel scale: 2.03 (arcsec/pixel)
Orientation: Up is 255 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: 16-18.Feb 2017
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:10x10min., R::10x10 min, G::10x10 min, B10x10 min, Ha: 16x15; Oiii: 16x15 Bin 2, Total Exposure Time - 880 min (14:40h).
More details: Dark and flat frames reduction,
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013 - 2017. All Rights Reserved
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