Celestial hemisphere:  Northern  ·  Constellation: Triangulum (Tri)  ·  Contains:  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
M33 - Triangulum Galaxy - HaRGB, Roland Barmettler
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M33 - Triangulum Galaxy - HaRGB

M33 - Triangulum Galaxy - HaRGB, Roland Barmettler
Powered byPixInsight

M33 - Triangulum Galaxy - HaRGB

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Description

Finally a couple of clear nights! I wanted to try how much a galaxy image can benefit from adding Ha data to an OSC color image. The "normal" image data took me three nights to gather and an additional night for the Ha. But that fourth Ha-night was well worth it, i was impressed how much better the end result is with just 1 hour of Ha added in.

I have to say I don't own a Ha filter, I used the ZWO Duo-Band filter (Ha 15nm, OIII 35nm) instead. I created an artificial Ha monochrome image in Pixinsight by adding 85% from the red channel and 15% from the green channel. Then I did a LinearFit of the Ha image against a luminance only copy of the RGB image. Finally I used the script "EmissionLineIntegration" from Hartmut V. Bornemann to blend the Ha data in.

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M33 - Triangulum Galaxy - HaRGB, Roland Barmettler