Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5457  ·  NGC 5477
M101 (with some colour data from DSS-II), Epicycle
M101 (with some colour data from DSS-II)
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M101 (with some colour data from DSS-II)

Equipment

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Acquisition details

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Description

Some colour data comes from the DSS-2 (Digitized Sky Survey) available at http://archive.eso.org/dss/dss but also used LRGB and Ha from my equipment as described above.

In particular the Blue from DSS-II was very useful.

Processing was mostly done in Pixinsight, but I also used the layers module in StarTools for merging.

Version B has an additional masked stretch applied to it.

Comments

Sky plot

Sky plot

Histogram

M101 (with some colour data from DSS-II), Epicycle