Sh2-278 in Orion

© Velimir Popov & Emil Ivanov 2020
Size: 1800 px

Sh2-278 is an emission nebula in the constellation Orion. It is observed in the western part of the constellation, about 3 ° west of the Orion Nebula and 3 ° NNE of the bright star Rigel, the brightest of Orion. It can be easily photographed through a medium power amateur telescope equipped with special filters, even if long poses are necessary. It is a fragment of the gas clouds that make up the molecular nebulous complex of Orion. Like the other peripheral clouds of the complex, this also shows signs of erosion due to the shock wave caused by the stellar wind of the shining stars of spectral class O and B belonging to the Orion OB1 association, which are also the source of ionization. Basically, the nebula is made up of two comet-like gas canopies, with the head facing the association and the dispersing canopy facing the opposite side. Part of the gas that makes up the cloud is not ionized, thus remaining dark, while other parts are instead illuminated but not ionized, thus shining by reflection.


Image details:


Center of field RA 05:19:48 (h:m:s)
Center of field DE -05:39:46 (deg:m:s)
Size 1.96 x 1.31 (deg)
Pixel scale: 2.96 (arcsec/pixel)
Orientation: Up is 75.4 degrees E of N
Charts and image details obtained from
Optic(s): 12" ASA Astrograph at F/3.6
Mount: ASA DDM85 Standard
Camera: SBIG STL 11000 M
Filters: Luminance, Red, Green, Blue, Astronomik filters; Ha Baader filter
Dates/Times: 23. Feb. 2017
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: ;R:6x10 min, G:6x10 min, B:6x10 min;Ha:6x15 min;; Bin 2 Total exp.time: 270 min. (4:30 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2020. All Rights Reserved
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