ASTRO: Cas 1 another heavily obscured galaxy

Continuing with my dark period imaging. This one is even fainter than
the last one.

Cas 1 (not to be confused with Cas A a supernova remnant) is a heavily
obscured irregular dwarf galaxy in Cassiopeia about 8 degrees north of
the Heart and Soul Nebulae. It is considered part of the Maffei group
of obscured galaxies. The distance to obscured galaxies is hard to
determine. There was only one estimate at NED but its determination is
purely by judging the size of a single HII region. Thus it is highly
suspect. It gives a distance of 16 million light-years which is likely
too far. The generally accepted distance to the Maffei group is more
like 6 to 10 million light-years. In any case it is nearby just nearly
invisible as it lies behind the gunk of the disk of our galaxy. It's
color is likely reddened by the dust. Most dwarf irregular galaxies are
quite blue. Cas 1 is likely no exception if we could see it without the
dust.

PGC15439_UGCA092 w/txt Last Nov.This one is so dim I spent 3 times my
usual time for the luminance channel and twice normal for the color
channels. It didn't seem to help much.

Since I mentioned it, here's a link to my Cas A image from 2007. It is
in dire need of reprocessing.
http://www.prairieastronomyclub.org/...10RGB5X10R.jpg

Image taken December 13, 2011 so I'm now less than a year behind in my
processing! At this rate I'll be caught up by this time next year.

14" LX200R @ f/10, L=12x10' RGB=4x10', STL-11000XM, Paramount ME

Rick

Rick,

that's an elusive Object indeed.
CasA is also difficult, but obviously easier than Cas1...

Stefan

"Rick Johnson" schrieb im Newsbeitrag
...

Continuing with my dark period imaging. This one is even fainter than
the last one.

Cas 1 (not to be confused with Cas A a supernova remnant) is a heavily
obscured irregular dwarf galaxy in Cassiopeia about 8 degrees north of
the Heart and Soul Nebulae. It is considered part of the Maffei group
of obscured galaxies. The distance to obscured galaxies is hard to
determine. There was only one estimate at NED but its determination is
purely by judging the size of a single HII region. Thus it is highly
suspect. It gives a distance of 16 million light-years which is likely
too far. The generally accepted distance to the Maffei group is more
like 6 to 10 million light-years. In any case it is nearby just nearly
invisible as it lies behind the gunk of the disk of our galaxy. It's
color is likely reddened by the dust. Most dwarf irregular galaxies are
quite blue. Cas 1 is likely no exception if we could see it without the
dust.

PGC15439_UGCA092 w/txt Last Nov.This one is so dim I spent 3 times my
usual time for the luminance channel and twice normal for the color
channels. It didn't seem to help much.

Since I mentioned it, here's a link to my Cas A image from 2007. It is
in dire need of reprocessing.
http://www.prairieastronomyclub.org/...10RGB5X10R.jpg

Image taken December 13, 2011 so I'm now less than a year behind in my
processing! At this rate I'll be caught up by this time next year.

14" LX200R @ f/10, L=12x10' RGB=4x10', STL-11000XM, Paramount ME

Rick