Struve 1772

Bob Hogeveen
Star: Struve 1772
Date & Time: May 13 2005
Seeing: 6 <1-10 Seeing Scale (10 best)>.
Transparency:
Location of site: Annen, The Netherlands, 53N 6E
Site classification: Village backyard
Sky darkness: 3.5 (UMI) <Limiting magnitude>
Telescope: AP Starfire 5' f/6
Mount: Vixen GP on Baader tripod
Eyepieces: Nagler 12mm, Nagler 9mm
Magnification:  67x, 97x
Harschaw's Scale: 2 <1 to 5>

 		A wonderful view in the large FOV's of the Naglers. There is another star of mag. 7.4 just 3' north of the pair and first looking with binoculars and with the Starfire @ 20x I thought for a moment that this was the actual pair, a bright and wide bino-double. A bit more magnification with the Starfire revealed the real pair easily. Two sharp pinpoints, but no color.


Steve Bodin
Star: Struve 1772
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

 Difficult in this poor air to see the secondary, viewed again on 26 May
and split well. All appear blue in color. The C component is very faint.
Measurement, AB 4.93 sec at 133 deg PA, AC 89.66 sec at 027.4 deg PA.
 


 

 

Alessandro Bertoglio
Star: Struve 1772
Date & Time: 24 May 2005 20.31 UTC
Seeing: III - IV Antoniadi
Transparency:
Location of site: Turin, Italy, 4504N 0742E
Site classification: Urban area with strong light pollution
Conditions: clear, no wind, mild temperature
Moon: full moon rising
Sky darkness: 3 (limiting magnitude)
Telescope: Takahashi Mewlon 300, Dall-Kirkham 300/3572 reflector
Eyepieces: Televue Plossl 15 mm.
Magnification: 238X
Diagonal: Yes, Televue 2" Everbrite
 
Now the seeing seems improving. Easy pair although pretty close and unbalanced. Primary star quite bright, white with bluish hue. Secondary rather fainter but well visible, with a strange pinkish to orange colour. Rings not easy to see. Extimated PA from 145 to 150 degrees. Interesting and fine pair with curious colour well suited for small instruments.
 


 
  
    

Jean Louis Badin
Star: Struve 1772
Date & Time: 25 May 2005 20.45 UTC
Seeing: III  Danjon
Transparency:
Location of site: Noisy le Grand - France 48°51 N 2°33 E
Site classification: Urban area with strong light pollution
Conditions: clear, wind, mild temperature.
Moon: none
Sky darkness: 2.5 (limiting magnitude)
Telescope: Nexstar 8 ( 203 /2000)
Mount: 10 : count equatoriale Celestron.
Eyepieces: Vixen LV 6 mm
Magnification: 333X
Diagonal: Yes, Televue 2" Everbrite
 
The difference in magnitude is very strong. The principal one is quite visible, it secondary much less and I must use the shifted vision. The colors are white. Separation is weak, I must use the 6 mm for more comfort and obscure my bottom of sky. D is invisible in my eyes but the sky was covered very quickly. Damage, the weather did not let me continue. Now Bootes is with the top of my building....


 
      

Florent Losse
Star: Struve 1772
Date & Time: May 25-26th, 2005
Seeing: 4/10
Transparency: very good
Location of site: St Pardon de Conques, France 4433N 0012W
Site classification: Rural
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

 B isn't visible in the 115/45x, the seeing seems ok with naked eye but is really poor at the telescope :[  Measured at 133°6  /  4"65 after a severe selection of measurable frames
 

Stev
Morgan Spangle
Star: Struve 1772
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  88.4" - 25.2 DEG
AD  208.9" - 358.7 DEG (THIS NEEDS TO BE CHECKED AGAIN)
 

  
 


Louis Marchesi
Star: Struve 1772
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: 240x
 
A relatively high magnification was needed to split this pair, owing to the nearly four magnitude difference between the A and B components. At 240x the components were well-separated. The primary was white and its companion blue. 
      
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