Struve 2070

Morgan Spangle
Star: Struve 2070
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

28.6 141.8

       

Axel Tute
Star: Struve 2070
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:

 Faint companion in the 12mm RKE (167x) at an estimated PA from 140°. 2094: Not a clear split. "Bump" in PA 70° visible in the 12mm RKE. Faint star also visible at PA 310°

 
         

Mike Sutherland
Star: Struve 2070
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

11:05pm PDT

12mm ortho (87x) and 7mm ortho (149x)

Once again I couldn't see the faint companion with the 12mm but could pick it out quite clearly with the 7mm. Just to check I went back to the 12mm and sure enough, it was there, just tougher to find.

      

Wolfgang Vollmann
Star: Struve 2070
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 16377+1933 Located south and east of Beta and Gamma Her. The wide pair (WDS catalog magnitude 7.9 and 10.4mag) shows almost no change in distance and position angle. It could be a physical double star with very long period or an optical double where the line of sight to the stars does not change in very long time; perhaps they are very distant?

Measures: STF2070 WDS: year 1897 / 28.9 arcsec / PA 140 deg WDS: year 2000 / 28.6 arcsec / PA 142 deg My measure: year 2006.52 / 28.6 arcsec / PA 141.8 deg


        
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