Struve 311

Steve Bodin
Star: Struve 311
Date & Time: 27 October 2005, midnight to 1 am local
Seeing: 3/10
Transparency: good
Location of site: Mattawa WA, USA 46N 119W
Site classification: rural
Conditions: temp 40F, no wind
Sky darkness: limiting mag 6.5
Telescope: Meade 16 LX200GPS
Eyepieces: not used
Imaging: DX8263SL video camera at prime focus
Magnification: app. 600x

 Difficult AB split due to the magnitude difference. the secondary is lost in the primary glare, and the third component is two magnitude fainter still. The fourth star is well outside my FOV, but visible if I slew the scope slightly south. Measurement, AB 3.34 sec at 118.5 deg PA, AC 25.08 sec at 109.8 deg PA., no measurement for D.
 

 
  
  

Eddy O'Connor
Star: Struve 311
Date & Time: Thursday, November 3rd,
2005
Seeing: 7/10
Transparency: 8/10
Location of site: Terara, New South Wales,
Australia, Long.150º.38 ; Dec. S 34º.52
Site classification: rural
Conditions: Temp. 18ºC
Sky darkness: limiting mag 6.5
Telescope: 8" Newt. F9
Eyepieces: 25mm K, 12.5 mm Ortho
Magnification: app. 600x
Harshaw Scale 1-5: 1 best

 Companion only split at high power. Two other fain stars wide in field. HS2.


 
 

Florent Losse
Star: Struve 311
Date & Time: Nov 05-06/06-07th, 2005
Time:
Seeing: 7 out of 10
Transparency:  out of 10
Location of site: 4433N 0012W 
Site classification: Rural
Conditions:
Sky darkness: limiting mag = maybe 2/3 at very best, <0 at worst !
Telescope:
- visual : 120mm refractor used as guidescope 
- imaging : homemade Newton 8", Barlow 3x with tube extender, Audine K400 (sampling 0"32/px) 
Eyepieces: 20mm,7.5mm 
Reductions: Reduc V3.49

Only splitted on the images. AB measured 118°6 / 3"31.
AC : 110°0 / 25"19
 

     
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