Struve 1773

Louis Marchesi
Star: Struve 1773
Date & Time: 28 May 2005 3:16 UTC
Seeing: Pickering 3
Transparency: Average
Location of site: New London Township, PA, US (+39d45m,-75d52m)
Site classification: Suburban/Rural
Conditions: Clear, calm, 11C (52F)
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

 Struve 1773 is a nice, wide triple with stars of approximately equal magnitude. They formed a slightly obtuse triangle, with the C star seemingly twice the distance from A as B. The three stars were too faint to allow me to perceive any color, so I'll call them white.


Steve Bodin
Star: Struve 1773
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

 Nice triple of faint stars, all seem blue in color. Measurement, AB
31.23sec at 211.8 deg PA, AC 63.28 sec at 100.9 deg PA, BC 80.01 sec at
079.5 deg PA.

 
 

Alessandro Bertoglio
Star: Struve 1773
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
 

It's described as a quadruple star but I was able to see only three stars (searching for the fourth stars I used this high power). The three observed components form a scalene triangle composed by gently faint stars but still fairly well visible.

The difference of magnitude of these stars is small (the brightest is the western, the second is the eastern and, finally, the
faintest is the northern) and the colours are whitish. No rings visible. Extimated PA: A-B about 85 degrees, A-C 25 degrees.

Where is the fourth star? Considerably west in the field there is a brighter star...
 


 
    

Morgan Spangle
Star: Struve 1773
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  30.0" - 209.8 DEG
AC  56.8" - 101.7 DEG
BC  72.1" - 78.4 DEG
 


  
 


Florent Losse
Star: Struve 1773
Date & Time: May 26-27th, 2005
Seeing: 6/10
Transparency: Bad, heavy haze in altitude
Location of site: St Pardon de Conques
33 :) France 4433N 0012W
Site classification: Rural
Conditions:
Sky darkness: m=4 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
 a sympathetic group just visible in the clouds. In spite of the 10th magnitude of the stars, this trio isn't a great sight on the screen. The Audine camera is switched to binning 2x2 to obtain a decent signal.

Measurements give :
AB = 211°7 / 33"98
AC = 102°4 / 57"09
BC = 078°7 / 72"39
 
Note : B is seen brighter than A (about 0.25 mag)
 
Ambiance : hot,very hot. And this heat seems to be the cause of a
spectacular evaporation in the Gascogne Gulf.
Every 30 minutes, the images from Meteosat show several new puffs that the wind transforms in a gigantic white sheet just above my head. I decide to take a try in the second part of the night at 02h00 local time ... it was
not a good idea :o(
 

  

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