Struve 2051

Morgan Spangle
Star: Struve 2051
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

13.9 18.4

      

David Jenkins
Star: Struve 2051
Date: 12 June 2006
Time:  5:00-7:30 UTC
Seeing: <1-10 Seeing Scale (10 best)>: 5
Transparency: <1-10 Scale (10 best)>: 8
Location of site:Orem, Utah USA
Latitude, 40.29694. Longitude, -111.69389
Site classification: Utah Valley urban area of 500,000 with strong light pollution due to acorn glass street lights which shoot light up and out – The bane of all local observers. Salt Lake City metro light dome to the northwest at 40 miles.
Conditions: Clear, breezy (as can be seen in some of the images), warm
Moon: Full moon raising late in observing session
Sky darkness: <Limiting magnitude>: 3.5
Telescope: Celestron GPS 11" on APT Wedge
Mount: Standard Celestron fork and tripod
Eyepieces: Meade Super Plossl – 32mm
Diagonal: Yes, Meade 1.25" flip mirror diagonal
Magnification: Approximately 350X using Nikon Coolpix 4500 and 4X zoom
Software: Reduc version 3.62 – Great software from Florent Losse. S33 group member.

 		Distance: 15.0, PA 21
 

       

Axel Tute
Star: Struve 2051
Date: 02.07.2006
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:

Easy (26mm Ploessel). Estimated PA is 0°. "A's" color is blue. "B's" color is green. 2090 A-C: Easy (26mm Ploessel). Estimated PA is 10°. "A's" color is red

 
           

Wolfgang Vollmann
Star: Struve 2051
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 16294+1036 STF2051 is in southern Hercules near the constellations Serpens and Ophiuchus. The 7.7 and 9.4mag components did change their distance and PA since the first measures 184 years ago only slightly. The WDS lists nearly the same proper motion for them and they are apparently a physical pair with a very long period.

Measures: STF2051 WDS: year 1822 / 14.9 arcsec / PA 22 deg WDS: year 2002 / 13.9 arcsec / PA 19 deg My measure: year 2006.52 / 13.9 arcsec / PA 18.8 deg

         

Richard Jepeal
Star: Struve 2051
Date: July, 18, 2006
Time:---
Seeing: 5/10
Transparency: ---
Location of site: New Britain, Connecticut
USA
Site classification: Urban
Conditions: ----
Sky darkness: ---
Telescope: 8in Celestron Nexstar
Eyepieces: ---
Magnification: 53x to 228x
  
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