Struve 2052

Morgan Spangle
Star: Struve 2052
Date: 11 June 2006
Seeing: <1-10 Seeing Scale (10 best)>: 5
Transparency: <1-10 Scale (10 best)>: 7
Location of site: Larchmont, NY
Site classification: Bright suburuban
Conditions: Cool, breezy
Moon: Full
Sky darkness: 3.5
Telescope: 23.5cm SCT
Mount: Takahashi NJP Temma 2
Eyepieces: SBIG ST2000XM CCD camera Magnification: n/a

NAME SEP PA NOTES

142.8 27.4

       

Axel Tute
Star: Struve 2052
Date: 29.06.2006
Seeing: <1-10 Seeing Scale (10 best)>: 7
Transparency: <1-10 Scale (10 best)>: 9
Location of site: Küssaberg-Dangstetten, Germany
Site classification: rural
Conditions: no wind, warm low humidity (I forgot to measure)
Moon: no moon
Sky darkness: Bortle 4
Telescope: Celestron 8
Eyepieces:
Magnification:

Companion was not visible in the 26mm Ploessel. Faint companion visible in the 12mm RKE. No color observed.

 
         

Mike Sutherland
Star: Struve 2052
Date: 30 June 2006
Time: 10:00pm to 12:00pm PDT
Seeing: <1-10 Seeing Scale (10 best)>: 7
Transparency: below average
Location of site: Beaverton Oregon, USA
45 28N, 122 51W
Site classification: Suburban
Conditions: 66F, dry
Sky darkness: limiting mag 3
Telescope: Takahashi FS128
Eyepieces: 30mm Ultima, 12mm ortho, 9mm ortho, 7mm ortho, 6mm ortho, Barlow.
Magnification: 35x, 87x, 116x, 149x, 173x, 327x

10:45pm PDT

12mm ortho (87x) and 6mm ortho (173x)

This one fooled me at first. The list says it has a 143d separation but what I observed were two nearly equal pairs quite close, (at 87x). I dropped in the 6mm ortho (173x) and suddenly I noticed the distant companion. It's mostly lost with direct vision but obvious with averted. So it's a triple! How fun.

Ambience: Mostly still, usual porch lights, tree's, shirt-sleeve warmth.
      

Wolfgang Vollmann
Star: Struve 2052
Date: 2006 July 6
Time: 21:00-23:00 UT
Seeing: 5 <1-10 Seeing Scale (10 best)>
Transparency: clear
Location of site: Vienna, Austria
Site classification: Suburban Sky
Conditions:
Moon:
Sky darkness: Naked eye limiting mag. 4.5
Telescope: 130/1040mm refractor
Eyepieces: n/a
Camera: SBIG ST237A
CCD Exposures: 6x10 seconds for astrometry and 6x1 seconds for distance/PA measurement.
Image measurement: astrometry with Astrometrica software and UCAC2 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 and an image size of approximately 16x12 arc minutes

WDS 16289+1825 STF2052 is southeast of Beta and Gamma Her and not hard to find. The components A and B are almost equally bright and have a distance of approximately 2 arcseconds. A distant companion C is more than 2 arc minutes to the northeast. On my images I could only measure C well. A and B were very hard to resolve with only one meter focal length. AB-C was not measured since 1925 (!) according to the WDS. My measure differs markedly from the WDS values. The two stars seem to have different proper motions and are probably an optical double.

Measures: STF2052 AB: year 2006.52 / distance 1.9 arcsec +- 0.2 arcsec / PA 129 deg +- 7 deg STF2052 AB-C: WDS: year 1911 / 147.5 arcsec / PA 27 deg WDS: year 1925 / 143.3 arcsec / PA 29 deg My measure: year 2006.52 / 135.8 arcsec / PA 45.5 deg

        
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