Struve 1808

Steve Bodin
Star: Struve 1808
Date & Time: 24 May 2005, 10pm to midnight
Seeing: 2/10 improving to 5/10
Transparency: fair
Location of site: Silverdale Wa, USA, 47N,123W
Site classification: Suburb
Conditions: 55F, no wind, damp
Sky darkness: limiting mag 5.6
Telescope: Celestron C8
Eyepieces: not used
Imaging: DX8263SL video camera at prime focus, f10, and 3x
Magnification: app. 333x and 1000x

 Very close pair for the conditions, used 2x zoom again, but the stars were
still joined. Need to remeasure on a night of good seeing with higher
magnification. The C component is very faint. Measurements, poor data, AB 2.6 sec at 083.7 deg PA, AC 68.28 sec at 107.5 deg PA.
 



  

Alessandro Bertoglio
Star: Struve 1808
Date & Time: 26 May 2005 20.24 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 8 mm.
Magnification: 447x
Diagonal: Yes, Televue 2" Everbrite

Damn! These little clouds are fastidious... and I must do the slalom between but I love my Mewlon, also during the worst condition it's able to offer to me usable images!

I used this high power in order to detect the faintest component. Difficult triple star cause the very dim third star. Primary and secondary star form a pretty easy and close pair. The primary, white yellowish, is sufficiently bright. The secondary is gently fainter with yellow to orange colour. The third component is noticeably more distant and very dim so it's difficult to see and needs averted vision, it's colour is obscure. No visible rings. Extimated PA: A-B about 80 - 85 degree (I'm fairly sure its position changed as this PA is pretty different from the PA published on the list), A - C about 110 degree. A fairly interesting triple star but needs best skies.
  




    

Florent Losse
Star: Struve 1808
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

 Not split at 45x. Although the images seems good, the measurements are scattered. Measures : 081°2 / 2"43
 


Morgan Spangle
Star: Struve 1808
Date & Time: May 29-30, 2005
Seeing: 4/5
Transparency: 2/5
Location of site: Larchmont, NY
40 55N 73 44W
Site classification:
Conditions: steady, calm, high haze, passing clouds
Sky darkness:
Telescope: Borg 101ED fl: 640mm
CCD Camera: ST237A, 2.39 pixels/arcsec
FOV 25 x 19'
Eyepieces:
Magnification:

 AC  61.2" - 108.4 DEG
 

  
 


Louis Marchesi
Star: Struve 1808
Date & Time: 15 June 2005 2:57 UTC
Seeing: Pickering 5
Transparency: Average
Location of site: New London Township, PA, US (+39d45m,-75d52m)
Site classification: Suburban/Rural
Conditions: Clear, calm, very warm, very humid (almost foggy), the scent of honeysuckle is in the air, 25C (77F)
Moon: 8 days (49% illuminated)
Sky darkness: 3.5 (limiting magnitude)
Telescope: TMB152 f/7.9 Apochromatic Refractor
Mount: Losmandy G-11
Eyepieces: TMB Super Monocentric 8mm, 5mm
Magnification: 150x, 240x
        		The AB pair of stars were white at 150x. I did not note any particular difficulty in splitting them. The 12th-magnitude C star required a magnification boost to 240x in order for it to be detectable in tonight's observing conditions. As were the AB pair, the C star was white. The seeing was poor enough that the AB pair appeared washed out at 240x.
    
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