A couple of Galaxies from March 20
Posted 29 March 2010 - 12:15 AM
Date: March 21st, 2010
Time: 08:30 UT, 1:30am MST
Object: NGC 3631 Spiral Galaxy in Ursa Major
RA 11h 21m
Dec +53 10'
Instrument & Eyepieces: XT10, 13mm Stratus, 2x Barlow, 92x & 184x
Seeing: Antoniadi Scale: I
Conditions: Clear and Cold, no wind.
This galaxy is about 50 million light years away and has a faint, round halo to it. The core is very bright, and rather sharp. Structures was evident in this galaxy including the hint of an arm to the north, some mottling and the core is brighter than the surrounding halo. A very pretty galaxy. I did a typo that I need to go in and correct and listed on the sketch as NGC 3651.
Time: 12:17am MST/07:17 UT
Object: NGC 3310 Mixed Spiral Galaxy in Ursa Major
RA 10h 18m 7s
Dec +53 30'
Instruments&Eyepieces: XT10, 13mm Stratus, 2x Barlow, 92x & 184x
Seeing and conditions are the same as above.
I thought I would share this not because it was a terrific sketch but the fact that it was a galaxy that truly reminded me of a planetary nebula. The galaxy is just below a very bright star (sounds familiar eh?). The galaxy appears similar to a bright planetary nebula. The core is very bright and stellar in its looks. The glow/halo around the core is like the nebulosity of a planetary nebula but is the actual galaxy as this one is face on. The edges are diffused. Very round in shape, no other structure or detail is evident other than that which I have listed.
For fun, and cause I'm not sure how I like the sketch I'll throw in NGC 3556. Conditions are the same as the other two posts.
Time: 07:36 UT; 12:36am MST
Object: NGC 3556 or M108, Barred Spiral Galaxy in Ursa Major
RA 11h 11m 5s
Dec +55 40'
Instrument & Eyepieces: XT10, 13mm Stratus, &2x barlow; 92x & 184x
Been here before when doing the Messier and several others to just observe it. Very long ellipse on this galaxy, lots and lots of mottling on this galaxy. There are some dark patches going on. The core is stellar like and small, the galaxy is elongated with averted vision and more mottling are evident. There are also several dark patches around the core to observe. The length is just a tad too long for me I think though on reflection.
M97 at this site is tremendous also. No filter is needed at all. The large round shape is brilliant with a hint of the eyes. It shone with a filter! I haven't refined the sketch though.
Posted 29 March 2010 - 04:17 AM
thanks for your posting
Posted 29 March 2010 - 04:54 PM
Posted 29 March 2010 - 09:05 PM
Posted 30 March 2010 - 10:55 AM
These are all beautifully rendered. Also it is great that you also include the nice write ups with the images. Excellent work.
Posted 31 March 2010 - 12:31 AM
Posted 31 March 2010 - 03:01 AM
I'd personally would love having a compass/directions in the sketches. It would make comparing the sketches quite a lot easier - at least for me.
And try not to explode on me but I think you got the spiral on NGC 3631 wrong as it should be facing east, instead of the north.
I do however like your rendering of M108 as it shows the familiar shape and amount of detail
Posted 31 March 2010 - 08:06 AM
Thank you for your input, it is appreciated. I will ensure I get the cardinal points down. I made an observation form that I use and I put the cardinal points to the side. I am re-thinking that as it has moved me from labeling the actual sketch. Thus sometimes on some of my sketches I am trying to re-collect and the orientation could be wrong.
One of the other things I have gotten away from is comparing the sketch to the Digitialized Sky Survey. You are correct on the arm, it is going to the east as seen
here. When I get home from work this afternoon I'll impose the sketch on the survey and try to see if I can align it. Thanks for picking that up. I'll revisit that galaxy hopefully next week if the weather clears up locally. I was observing with other people that night and one guy had a 25 inch Obsession and was having trouble collimating it which was pulling me away from my scope and was distracting to a couple of items I was observing at the time. Again, thanks for the input.