Not a good weekend for me. I started itching yesterday and having pain and so I went in to the local clinic at the hospital that is run by my insurance company. Looks like shingles. I have to follow up tomorrow with my primary care physician. So I haven't done any more with the digitalizing of my sketches, but will as I feel better. Instead, I can surf the net and look things up and I have picked up another target that I want to go after next new moon cycle IF the local weather cooperates. It is Cassiopeia A.
Yeah, right Jay, I may hear some say. In higher scopes like a 18" or a 20" it is viewable so in the 20" Obsession I will be able to see it. Well, I've read about a 16" scope seeing it so I figure I'll also try the 14" and even my XT10. I really want to compare views on this one between the three scopes. Each scope will get its own sketch (if the object or part of the object is viewable in the aperture). I believe the 20" will show it without a problem and I believe the 14" will also show it. The 10" will be the one that I am not sure of.
So, to provide the information I have found on visually observing Cassiopeia A, I am going to link to the various sources I have found.
The first is by Steve Gottlieb (he made the observations over at the NGC/IC Project) which he posted over at Cloudy Nights. I really admire Steve and his years of observing and since I get to the Bay Area from time to time since I have family there, I hope perhaps to someday meet him. Here is the link to his post on visually seeing Cassiopeia A over at Cloudy Nights.
Please note the post by Uwe from Germany who states in answer to a question about seeing it in a 10 inch scope if that is possible: "Yes it is. A few nights after I could observe the SNR with 16" I tried it with 10". With UHC and 143x a friend and I could hold a faint glow with averted vision. We could not see the longish shape." So in the right conditions in a dark site with good seeing, my XT10 should detect it.
Here is Reiner Vogel's site from Germany's post on viewing a couple of SN remnants including Cassiopeia A I recommend looking at his ATM scopes, they are very cool (go to home and then look at his scopes).
Here is a link to a sketch of Cassiopeia A done in a 16" scope. I'm surprised by the brightness and detail in the sketch, but all reports show this is not a super hard object. It will be interesting to see for myself.
Please see the finder charts listed in thread over at Cloudy Nights. Here are the images:
These are the charts that John T. from Austin Texas posted over at Cloudy Nights.
So give it a try, as stated in the thread, you'll never know if you can see it in your scope unless you try. Remember that the OIII filter helps as did the UHC filter. Please post a comment if you see it in your scope or part of it. It would be interesting to keep track of observations on this one I think.