Struve 1818

Louis Marchesi
Star: Struve 1818
Date & Time: 29 May 2005 3:47 UTC
Seeing: Pickering 3
Transparency: Below Average
Location of site: New London Township, PA, US (+39d45m,-75d52m)
Site classification: Suburban/Rural
Conditions: Clear, calm, heavy dew, 10C (50F)
Sky darkness: Not determined
Moon: None
Telescope: TMB152 f/7.9 Apochromatic Refractor
Mount: Losmandy G-11
Eyepieces: Baader Mark V Binocular Viewer with 1.25x Glaspath
Compensator
TMB Super Monocentrics 14mm
 Magnification:107x

 In tonight's seeing, this 5".5 double was more difficult than it should have been. The two magnitude difference between the components made for a bit of a challenge, however, I saw the pair of white stars split with just a moderate amount of difficulty at this magnification.


Steve Bodin
Star: Struve 1818
Date & Time: 25 May 2005, 10pm to midnight
Seeing: 3/10
Transparency: fair
Location of site: Silverdale Wa, USA, 47N,123W
Site classification: Suburb
Conditions: 55F, no wind, dry
Sky darkness: limiting mag 5.6
Telescope: Celestron C8
Eyepieces: not used
Imaging: DX8263SL video camera at prime focus, f10, and 2x
Magnification: app. 333x and 666x

 Used the camera zoom function to split this one. Whitish primary and blue
secondary. Measured, 5.7 sec at 327.5 deg PA.
 

 
     

 
   

Alessandro Bertoglio
Star: Struve 1818
Date & Time: 27 May 2005 21.49 UTC
Seeing: IV Antoniadi
Transparency:
Location of site: Turin, Italy, 4504N 0742E
Site classification: Urban area with strong light pollution
Conditions: clear, no wind, mild temperature, little hazy
Moon: none
Sky darkness: 2.5-3 (limiting magnitude)
Telescope: Takahashi Mewlon 300, Dall-Kirkham 300/3572 reflector
Mount: 10 Micron GM2000 with FS2 controller
Eyepieces: Televue Plossl 15 mm.
Magnification: 238X
Diagonal: Yes, Televue 2" Everbrite

Pretty easy pair but fairly faint although sufficiently separed. Primary pretty bright, white slightly yellowish. Secondary fainter but not excessively, slightly more yellowish then the primary, maybe with orange tone. No visible rings. Extimated PA about 340 degrees (maybe the pair changed its position as my extimated PA is fairly different from PA on the table). Medium interest double star.
 


 
  

       

Florent Losse
Star: Struve 1818
Date & Time: May 27-28th, 2005
Seeing: 6/10
Transparency: Good, thin clouds running
Location of site: St Pardon de Conques, France 4433N 0012W
Site classification: Rural
Conditions:
Sky darkness: m=6
Telescope:
- visual : T115, guidescope suited with a 20mm eyepiece (G=45x)
- imaging : homemade Newt T200, Barlow 3x, Audine K400 (sampling 0"43/px)
Reductions: done with a future release of Reduc.
Eyepieces: 20mm
 Magnification: 45x

 coming back to more reasonable things. The clouds are thicker now
and there is more instability, at 45x the secondary seems ok by
intermittence with a bit of patience (maybe mind seen ! I know too much
things about this star ;o) Measurements : 330°1 / 5"47
 

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