12 Coma Berenices

Steve Bodin
Star: 12 Coma Berenices
Date & Time: 10/3/2005
Seeing: 5 <1-10 Seeing Scale (10 best)>
Transparency: fair
Location of site: Silverdale Wa, USA 47N,123W
Site classification: Suburban
Conditions: 45F, damp, no wind
Moon:
Sky darkness: 5.5 <Limiting magnitude> 
Telescope: C8
Eyepieces: no used
Magnification: appx. 350x
Camera: DX8263SL video camera at prime focus
 
A triple, but the project has only the brighter pair. The B
component is really dim, listed 11.8 in the WDS, but seemed fainter.
Looked up and noticed that I could only see 3rd mag, fog had settled!
Measured AB 36.61 sec at 057.8 deg PA, AC 65.4 sec at 167.7 deg PA.
 

   
   


Louis Marchesi
Star: 12 Coma Berenices
Date & Time: 17 April 2005 2:00 to 5:00 UTC
Seeing: Pickering 6
Transparency: Average
Location of site: New London Township, PA, US (+39d45m,-75d52m)
Site classification: Suburban/Rural
Conditions: Clear, calm, 6C (43F)
Moon: 55% (8.1 days old) waxing gibbous
Sky darkness: Not determined
Telescope: TMB152 f/7.9 Apochromatic Refractor
Mount: Losmandy G-11
Eyepieces: 17mm Nagler, 5mm TMB Super Monocentric
Magnification: 71x, 240x
 
At 71x the wider (AC) pair was easy to split. I saw the components as white and blue. I could not see the closer, dimmer B star at this power.

Even though the AB pair is widely separated at about 35 arcseconds, I needed higher magnification (240x) to be able to see the white 12th-magnitude B star.
 

   
   

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