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A famous triplet in Leo: M65, M66 and NGC 3628 | by Trois_Merlettes
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A famous triplet in Leo: M65, M66 and NGC 3628

The 3 spiral galaxies which form the M66 group exhibit marked differences. M66 is actively forming new stars but M65 looks very quiet. The differences are emphasized here with the use of a Halpha narrow band filter in addition to the usual LRGB ones. The red spots in M66 are the active HII regions. This activity results probably from a previous encounter with NGC 3628 (on the right top corner)

C11-HD and STL 11km on G11 mount.

Total exposure: 8hours 40' in 10' subs

2 hours in luminance binned 1x1

3 hours 40' in Halpha binned 2x2

1 hour for each RGB filter binned 2x2

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Taken on March 17, 2012