M33 in dual band (Tom Gray)

Celestial hemisphere: Northern · Constellation: Triangulum (Tri) · Contains: HD9269 · HD9483 · HD9686 · HD9966 · IC 131 · IC 132 · IC 133 · IC 135 · IC 136 · IC 137 · IC 142 · IC 143 · M 33 · NGC 588 · NGC 592 · NGC 595 · NGC 598 · NGC 604 · Triangulum Galaxy · Triangulum Pinwheel

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M33 in dual band

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M33 in dual band

After some success capturing this grand galaxy from a dark sky site in the summer, using my 8” SCT, I wanted to try a longer exposure with the wider field of view I can achieve with my refractor set up. This image taken in between the clouds over two nights, combines data at slightly different focal lengths, as I try and optimise the focal reduction on my Zenithstar. There is some vignetting at 4.8 pixels / arc second; hopefully ~4.5 pixels/“ should be optimum.

An hour of luminance data using an IR cut filter has been supplemented with a little red data, and (due to the waxing moon) over an hour of data from my narrow band filter. Mapping this to Green and Blue, has allowed me to produce a false colour HOO image in Startools.

Due to some haze, vignetting and aberration from my semi-APO the image is not pin sharp. I hope I can improve this by tweaking the focal length and capturing more data under better sky conditions. This is my longest integration so far, and I am enjoying capturing some wider fields and appreciate the less demanding tolerances of imaging with with my refractor.

Low-Cost Astrophotography
Altair Astro 183 M/C Hypercams
UK Astro-Imaging

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Status	Advanced success
Started	...
Astrometry.net job	4103119
PixInsight job	FNMGSWOK7GC8Q5NS1S8OYTGH6D9LCB89
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	01h34m21s.41
RA (top/left)	01h30m38s.13
RA (top/right)	01h38m13s.34
RA (bottom/right)	01h38m08s.58
RA (bottom/left)	01h30m26s.60

Dec (center)	+30°42′53″.8
Dec (top/left)	+30°03′56″.2
Dec (top/right)	+30°06′10″.9
Dec (bottom/right)	+31°21′35″.5
Dec (bottom/left)	+31°19′03″.6

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M33 in dual band

M33 in dual band

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M33 in dual band

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