Struve 1809
 
Florent Losse
Star: Struve 1809
Date & Time: May 23-24th, 2005
Seeing: 3-6/10
Transparency: poor, high altitude clouds
Location of site: St Pardon de Conques, France 4433N 0012W
Site classification: Rural
Conditions:
Sky darkness: m=5 between clouds
Moon:
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

 After the success on stf1826 I was sure for this one. I mentally noted 4" and did not look at the mag of B. No sign of a companion in the guidescope ... I understand rapidly when looking at the first image on the
screen! Measured 195°1/4"21
 

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Alessandro Bertoglio
Star: Struve 1809
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

Rather difficult pair under these sky conditions: the pair is considerably unbalanced and pretty faint even if the separation is sufficient. Primary star fairly bright maybe whitish, Secondary noticeably fainter, hard to detect directly (best with averted vision). No visible rings. Extimated PA about 210 degrees. Interesting difficult double, needs medium telescope and clear skies.
  





     
 
Steve Bodin
Star: Struve 1809
Date & Time: 27 May 2005, 10pm to midnight
Seeing: 4-5/10
Transparency: fair
Location of site: Silverdale Wa, USA, 47N,123W
Site classification: Suburb
Conditions: 60F, no wind, dry
Sky darkness: limiting mag 5.6
Moon:
Telescope: Celestron C8
Eyepieces: not used
Imaging: DX8263SL video camera at prime focus, f10
Magnification: app. 333x

 Close unequal, faint pair. I thought that this might be more difficult,
but was obvious on first glance. Primary a creamy color and secondary maybe blueish. Measured, 4.71 sec at 198.1 deg PA.
 
 


Louis Marchesi
Star: Struve 1809
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 5mm
Magnification: 150x
     
This pair was very difficult in tonight's conditions. I was able to detect both stars, but only using high magnification. Even with averted vision I noted this pair of white stars as being extremely faint.
     
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