Struve 1938

Steve Bodin
Star: Struve 1938
Date: 10 June 2006
Time: 11pm to midnight
Seeing: 3/10
Transparency: good
Location of site: Mattawa Wa, USA
46.7N,119.9W
Site classification: Rural
Conditions: 60F, no wind, dry
Sky darkness: limiting mag 4.5 due full moon
Telescope: Meade 16 inch LX200GPS UHTC
Eyepieces: not used
maging: DX8263SL video camera at f10 and f20
Magnification: app. 600x, 1200x
mu2 Boo Famous Bootes triple with the wide separation listed as STFA 38. Project is the BC companion pair. We did this one last year?? Anyway, memory is the second thing to go; measurement 2.37 sec at 006 deg PA
 



      

William Schart
Star: Struve 1938
Date: 6/19/06
Time: 10:36 PM
Seeing: 4 out of 5
Transparency:
Location of site: Columbia, USA
Site classification: Suburban
Conditions: warm
Sky darkness: around mag 5 (LM)
Telescope: C8
Eyepieces: 25 and 10 mm
Magnification:  		The target pair is actuyally the BC combo split at low power. To the N perhaps about 350 was the brighter A member. All appeared yellow.
       

Brian McInnerny
Star: Struve 1938
Date: 2006 June 30/ July 1
Time: 0020UT
Seeing: 5/10 (10 best)
Transparency: Hazy
Location of site: SW England Site
Site classification: Suburban Sky
Conditions:
Moon:
Sky darkness:  Naked eye Limiting mag:
Zeta Boo=3.8
Telescope: ETX 90EC (90mm)
Eyepieces:
Magnification:

Again not split. Quoted as 2.3" arc seperation.The field stars were 8th or 9th mag. As above the double was oval. This is all down to the ETX being only 90mm OG I suppose.
        

Wolfgang Vollmann
Star: Struve 1938
Date: 2006 July 26
Time: 21:00-24:00 UT
Seeing: 5 <1-10 Seeing Scale (10 best)>
Transparency:  clear
Location of site: Vienna, Austria
Site classification: Suburban
Conditions:
Moon:
Sky darkness: 4.5 <Limiting magnitude>
Telescope: 130/1040mm refractor
Camera: SBIG ST237A CCD
Exposures: 6 or 12 x 10 seconds for astrometry. Distance/PA measurement was done with these images also except where noted (bright stars need shorter exposure times of 1 sec or less)
Image measurement: astrometry with Astrometrica software and UCAC2 or USNO B1.0 catalog (see http://www.astrometrica.at); with exact focal length and image orientation I measured distance and PA with AIP4WIN software. I took means of measuring all my images for a star. There is a scatter of 0.2 arcsec in separation and 0.2 deg in PA. Scatter in PA is much larger if the stars are very close. Note: All images have north up
Eyepieces: n/a
Magnification: n/a

STF1938 = WDS 15245+3723

Mu Bootis (STFA 28Aa-BC) is a wide double, visible in the 7x50 finder and shown on the image. I could not separate the fainter pair STF1938BC on my images. The close pair was easily resolved visually at x260.

Mu Boo = STFA 28Aa-BC. Southern star = STF1938 (not separated on this image). Measure: STFA 28Aa-BC: year 2006.57 / distance 107.9 arcsec / PA 170.9 deg


 
      
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