ngc6888 h-alpha image blended with DSLR image (see description) (Stefano Ciapetti)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888 · Sh2-105

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ngc6888 h-alpha image blended with DSLR image (see description)

Powered byPixInsight

ngc6888 h-alpha image blended with DSLR image (see description)

This image is the combination of an image taken with the Newton Orion 250 F 3.9, a QHY183M cooled and an Astronomik CCD 12nm h-alpha filter, made around 320 60secs unguided exposures between the nights of the 5th and 11th june, and a combination of an image made with an Acuter 90ed with F 6.7 ap reducer and a modded Canon 600d + Astronomik EOS clip UHC-E filter. Approximately 260 120 secs unguided subs. All the above on top an Ioptron CEM60EC

The strange thing was that the nebula coming from DSLR image, after stacking, come totally green. Never seen that. Therefore I used the green channel as red channel. The resulting image has been combined with the HA image using the HA image as luminosity. (Wikipedia)

I am not very happy of the result. Later on I will post h-a and DSLR image.

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.

Thanks for looking

Low-Cost Astrophotography
Short exposures DSO
Fast Newtonians
ZWO ASI183/QHY183
Suburban Astrophotography
Imagers of Italy

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Status	Advanced success
Started	...
Astrometry.net job	3598473
PixInsight job	V582RGPZD6LD1PAIEGDXG9TBB20ENJE1
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h11m55s.404
RA (top/left)	20h10m10s.831
RA (top/right)	20h11m33s.758
RA (bottom/right)	20h13m39s.524
RA (bottom/left)	20h12m17s.332

Dec (center)	+38°22′30″.30
Dec (top/left)	+38°33′33″.77
Dec (top/right)	+37°59′37″.68
Dec (bottom/right)	+38°11′20″.56
Dec (bottom/left)	+38°45′22″.82

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ngc6888 h-alpha image blended with DSLR image (see description)

ngc6888 h-alpha image blended with DSLR image (see description)

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ngc6888 h-alpha image blended with DSLR image (see description)

ngc6888 h-alpha image blended with DSLR image (see description)

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