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The whale galaxies in Canes Venatici

Optics Borg ED101 at f/8.8
Camera Canon EOS20D modified
Filters Astronomik CLS clip filter
Date 9 and 10 Feb 2008
Location Antares Observatory
Sky Conditions mag 5 sky
Exposure 62x10min ISO800
total: 10h 20min
Programs used Fitswork, CCDNight XP, Photoshop
Notes Goal of this image was to bring out the very dim tidal tail of NGC3628. Unfortunately its brightness was lower than I expected. Despite the accumulated exposure time only the bright part of the tail can be seen. This may have two reasons: Too images of the 20D CMOS chip were too noisy (readout noise, dark current) or the cut off of light smaller than 400nm due to the CLS filter.

LeoTrio Inverted

Click on the image above for an inverted image, showing more details of the tidal tail. For more information click here or here.

M108 and M97

click here for a 50% size 1710x1150 (728KB)

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