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M48 Hertzsprung–Russell diagram | by Mickut
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M48 Hertzsprung–Russell diagram

A jab at being scientific. I tried to make a Hertzsprung–Russell diagram from an older Messier 48 open cluster image I had taken with regular LRGB filters.


The linear, calibrated B and G channel images (4x5min integration time each at full moon) were processed in PixInsight to flatten sky gradient, extract non-saturated stars (position, size, brightness) and to get a reference Tycho data. These data files were correlated in Excel to get an offset from measured to known magnitudes.


The HR-diagram is simply a scatterplot of V magnitude over B-V magnitude. I ended with 809 data points with pretty decent linearity.


I also wrote a blog posting about the process.

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Uploaded on January 17, 2015