Struve 1812

Florent Losse
Star: Struve 1812
Date & Time: May 19-20th, 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

 STF1812 : Nice double, easy with the T115, measurement 108°4 / 14"16
 



Steve Bodin
Star: Struve 1812
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

 Actually quadruple, but AB is 0.2 sec, so forget that. Measurements, AB-C,
15.99 sec at 106.5 deg PA, AB-D 74.81 sec at 150.9 deg PA.
 



 

Alessandro Bertoglio
Star: Struve 1812
Date & Time: 26 May 2005 21.04 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

Between one small cloud and another. Not a difficult triple when these fastidious clouds are not in the field. The primary star is pretty bright, white with yellowish tone, sometime it shows a dim ring. Secondary, fairly distant, quite fainter but still well visible, with grey to yellowish hue. The third star is considerablyr more distant and very faint but still directly detectable. Extimated PA: A – B about 100 degrees, A - C about 140 - 145 degrees. A medium interest triple star.

  

     
 
Louis Marchesi
Star: Struve 1812
Date & Time: 29 May 2005 3:25 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

 The AB components of this system are Otto Struve 277, a very close (0".28) pair obviously not worth even contemplating on a night like tonight (or any night, given that I'm using a 6-inch glass). The AC pair was fairly easy to see as an uneven pair of white stars. When the atmosphere steadied enough, I could glimpse the 12th-magnitude D component well separated from AC and hovering to their South.


Morgan Spangle
Star: Struve 1812
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:

 AB-D  77.8" -230.6 DEG
 

 
 

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