SNR 110.3 + 11.3, DeHt 5 and vdB 152

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne-Corrector (focal length 910mm)
ASA DDM60, no guiding

Camera / Exposure

Canon 6D

73 x 10min

Moravian G3-16200, Astrodon filters

L 45 x 3min bin 2x2, 41 x 3min bin 2x2
Hα 2 x (21 x 20min)
OIII 2 x (18 x 10min) bin 2x2

Total exposure time: 36h 28min

Processing

PixInsight, Fitswork, Photoshop

Notes

This image took me more than 7 years to create. The first time I shot with an unmodified Canon 6D in 2013. But was not satisfied with the data after I had the opportunity to process Frank Sackenheim's CCD data of the same object (here or on Frank's homepage). In 2018 I made attempts with luminance shots in 2x2 binning with a Moravian G3-16200 (due to the bigger sensor of the Canon 6D now as 2 panel mosaic), but I have not continued this project. In summer 2020 I found this old data again, added additional Luminance-data and new Halpha- and OIII-data and finally tried to create an image with these old and new data.

The red streakes crossing the image in diagonal direction are a small part of the huge supernova remnant SNR 110.3+11.3 in the constellation Cepheus. It is one of the nearest supernova remnants and only 1300 light years away from earth. These shocked molecular gas filaments were discovered and catalogued in 2001 by John Bally and Bo Reipurth.

Van den Berg (vdB) 152 is a blue reflection nebula that glows at the bottom of a dark Bok globule called Barnard 175. Near the edge of a large molecular cloud, interstellar dust in the region blocks most of the starlight behind it or scatter light from the embedded bright star giving parts of the nebula a characteristic blue color. Ultraviolet light from the star is also thought to cause a dim reddish luminescence in the nebular dust.

Embedded in the left side of the nebula is the Herbig Haro object HH 450, a jet emitted from a newly forming star.

Dengel-Hartl (DeHt) 5 is a HII- and OIII-region, maybe an ancient planetary nebula, ionized by the white dwarf WD 2218+706 (the blue star in the center of the nebula). Beverly Lynds catalogued the brighter part as LBN 538.

Copyright: Thomas Henne