Melotte 15 (Heart of the Heart) HaRGB - 4 Dec 2019 (Geof Lewis)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 1805 · Sh2-190

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Melotte 15 (Heart of the Heart) HaRGB - 4 Dec 2019

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Melotte 15 (Heart of the Heart) HaRGB - 4 Dec 2019

Having imaged this target a couple of months ago in Ha, I decided to return to it and try for an HaLRGB version. My previous Ha comprised 1.5 hours of 5 min subs, which I've since learnt isn't long enough subs for NB, so I shot another 3 hours at 15 min subs. In addition I captured 9x10 subs for each of RGB and 18x10m L. After grading and stacking the Ha, I used 9 of the 12 and then added them to the previous Ha.

Next I processed the Ha as R together with the RGB and then layered the Ha using a soft light combine to enhance the detail to get the final L(Ha)HaRGB result.

Disappointingly, as can be seen, there is virtually no colour in the stars, maybe just a tad of yellow showing, but the blue stars are all saturated, so other than the red nebulosity, I don't see much advantage over the mono Ha only image. In my view, the Ha on it's own (see image version B) shows much more structure in the nebulosity. I probably need to shoot much shorter subs for RGB star colours, so I might try for that another night.

I processed the 3 hours of L that I captured, but couldn't see how it would add anything to the final image, so I haven't used it.

Original
B
Final
C

B

Description: Ha only image

Uploaded: ...

C

Description: Added 15x2min each RGB for star colour, plus increased sharpening and saturation.

Uploaded: ...

Clusters - Open
Nebulae

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Status	Advanced success
Started	...
Astrometry.net job	3156767
PixInsight job	KRMGLZRGIEBYSX9G6GI1AA97TGRDXU3E
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	02h33m32s.436
RA (top/left)	02h35m10s.130
RA (top/right)	02h32m00s.963
RA (bottom/right)	02h31m55s.826
RA (bottom/left)	02h35m03s.680

Dec (center)	+61°26′25″.30
Dec (top/left)	+61°34′22″.90
Dec (top/right)	+61°35′19″.47
Dec (bottom/right)	+61°18′25″.67
Dec (bottom/left)	+61°17′27″.90

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Melotte 15 (Heart of the Heart) HaRGB - 4 Dec 2019

Melotte 15 (Heart of the Heart) HaRGB - 4 Dec 2019

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Melotte 15 (Heart of the Heart) HaRGB - 4 Dec 2019

Melotte 15 (Heart of the Heart) HaRGB - 4 Dec 2019

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