[AZ-Observing] Re: M101 for the month of May

Hi Chris,

A great shot! I have it up as my desktop picture so I can admire it for 
awhile.
Now for the questions borne of Novice ignorance and curiousity. On your 
website there are a couple of statements that I'm pondering over:

"its inclination is less than 1 degree and is face on to our line of sight."

How is this actually calculated and/or figured out? Do all spiral galaxies 
have a certain degree of "roundness" so any amount of "obliqueness" can be 
corrolated into degrees of "tilt" or other?

"Hordes of faint background galaxies dot this image, most being a leaden 
yellow color, dimmed from their great distance through intergalactic dust."

Is this dust causing the "yellowing" galactic or interstellar dust 
collecting around the galaxy itself in the plane of or within the 
gravitational field of that galaxy? Or an unrelated dark nebula somewhere 
between here and there? And / or is this caused because of the general 
"dustiness" of the Universe?

Jimmy Ray


----- Original Message ----- 
From: "Chris Schur" <comets133@xxxxxxxxx>
To: "Rik Hill" <rhill24@xxxxxxx>; "Az-Observing List" 
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Rotramel AZ77)" <rick.rotramel@xxxxxxxxxxxxx>; "Robert Nemiroff APOD" 
<nemiroff@xxxxxxx>; "S&T Gallery" <gallery@xxxxxxxxxxxxxxxxxxx>; "Arlene 
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Sent: Thursday, May 24, 2007 11:56
Subject: [AZ-Observing] M101 for the month of May


HI all,

It took all month to image this one, due to clouds,
wind, and giving it lots of exposure time.  Anyway, I
think youll like the lastest image of the Pinwheel
galaxy with our newer ST10xme camera.  It does 10x
better job on galaxies than the older ST8i with the
same setup and exposures!

http://www.schursastrophotography.com/ccdimagepages/m101-3.html

Comments?

Chris

Take Care,

Chris
Astro: http://www.schursastrophotography.com
Robotics: http://www.schursastrophotography.com/roboticsmain.html



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