[Lvas] FW: M-13, the propeller

[roger ivester]

All,

 

A drawing from my original field drawing dated 19-May-09, using a 12-inch reflector. 

 

I have another sketch from my backyard using my 10-inch reflector. It does not show the dark lanes nearly as well. The transparency was at least one magnitude or more less, and there was some ambient lighting very close.  

 

This sketch was made from a dark site in the South Mountains, 20 minutes N of Boiling Springs, North Carolina.

 

I inverted the colors on my scanner. 

 

roger
    
 
  
 
From: drivester at hotmail.com
To: lvas at lvlug.org
Subject: M-13, the propeller, and scope review
Date: Wed, 20 May 2009 12:12:41 +0000



All,
 
Steve Davis and I easily saw the propeller last night using Steve's 12-inch Meade Lightbridge. We observed from the base of the South Mountains, only 20 minutes north of my home in Boiling Springs, North Carolina. The temperature was a comfortable 50° with slightly breezy conditions. Limiting naked eye magnitude would easily exceed 6.5. Both of us rated the seeing as good, but not excellent. We observed till after midnight.   
 
Steve saw it immediately at almost two hours from the meridian. Using a 7mm Nagler @ 196x. The cluster presented itself as a very large, well resolved cluster with many star chains and dark crevices throughout. 
  
I found that I could best see the subtle propeller using averted vision. During each scan with my eyes, a different dark lane would stand out....a most interesting phenomenon. 
 
Both of us were surprised that we had never seen the dark lanes before. 
  
Roger
 
 
  
 
 
    






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