Struve 3056

Richard Jepeal
Star: Struve 3056
Date: October/2006
Time:
Seeing: ---
Transparency: ---
Location of site: New Britain, Connecticut
USA
Site classification: Urban
Conditions:
Sky darkness: ---
Telescope: 8in Celestron Nexstar
Eyepieces: ---
Magnification:


       

Steve Bodin
Star: Struve 3056
Date: 22 Oct 2006
Time: 9 to 11pm
Seeing: 4-5/10
Transparency: fair
Location: Mattawa Wa, USA, 46.7N,119.9W
Site classification: Rural
Conditions: 48F, no wind, dry
Sky darkness: limiting mag 6.5
Telescope: Meade 16 inch LX200GPS UHTC
Eyepieces: not used
Imaging: DX8263SL video camera at f10 and f30
Magnification: app.600x and 1800x

Old friend here, also something new. The project pair is actually the CD components, which I have never sought out before. Usually try the close primary and occasional sight the C companion. The AB pair could not be split with prime focus, used 3x barlow for it. Measurements, AB 0.74 sec at 145.1 deg PA, AB-C 25.45 sec at 003.5 deg PA, AB-D 94.4 sec at 238.4 deg PA, CD, the project pair, 111.7 sec at 227.6 deg PA.
      

Wolfgang Vollmann
Star: Struve 3056
Date: 22 Oct 2006
Time:
Seeing: 5/10 (10 best)
Transparency: clear
Location: Vienna, Austria
Site classification: Suburban
Conditions:
Sky darkness: Naked eye limiting mag. 4.5
Telescope: 130/1040mm refractor
Eyepieces:
Imaging: SBIG ST237A CCD
Magnification:
Note: All images have north up
Please follow the links to see the images!

 The close AB pair was unresolvable at my focal length of one meter. Companions C and D were clearly visible on the 10s exposures.
 
http://static.flickr.com/106/280761958_6e1d172f9c_o.jpg

AB is the brightest star in the middle, C is bright and relatively close above (north) and D is the brightest star towards lower right.

As usual I did astrometry on the images with Astrometrica and calculated PA and distance directly from the RA and Declination I got.

Measures: year 2006.81 (I used 17 images for this)
STF3056 AB-C: distance 25.7 arcsec / PA 3.3 deg
STF3056 AB-D: distance 95.8 arcsec / PA 238.1 deg
STF3056 C-D : distance 112.7 arcsec / PA 227.3 deg

Since the stars were clearly separated I determined their magnitudes from the astrometry images. These are instrumental

red magnitudes with no photometric filter used:
AB = 7.2mag / C = 9.6mag / D = 10.7mag
 
     
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