Struve 1918

Morgan Spangle
Star: Struve 1918
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

17.8 19.6


      
 
David Jenkins
Star: Struve 1918
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: 17.5, PA: 26
 

      

Alessandro Bertoglio
Star: Struve 1918
Date: 14 June 2006
Time: 20.33 UTC
Seeing: III - IV Antoniadi
Transparency: ---
Location of site:Turin, Italy, 4504N 0742E
Site classification: Urban area with strong light pollution
Conditions: clear, foggy, no wind, warm temperature
Moon: no moon
Sky darkness: 3 (limiting magnitude)
Telescope: Takahashi Mewlon 300, Dall-Kirkham 300/3572 reflector
Mount: 10 Micron GM2000 with FS2 controller
Eyepieces: Televue Plossl 8 mm.
Diagonal: Yes, Televue 2" Everbrite
Magnification: 447X

Easy pair rather wide but the sky, not yet enough dark, makes some difficulty observing the secondary one. The primary is moderately bright, whitish with little yellowish hue. The secondary one is decidedly dimmer but still well visible using direct vision. The color of this star seems me orange (it is strange, so dim stars don't normally show a color so well detectable). No visible rings. PA estimated about 10 degrees. Cause the faint secondary, the smallest instruments, under analogous conditions, could have some difficulties

 
       

Richard Jepeal
Star: Struve 1918
Date: June 17, 2006 UT
Seeing: Vary, from 5/10 to 8/10 (Zenith)
Transparency: ---
Location of site: New Britain, Connecticut, USA
Site classification: Urban
Conditions:
Sky darkness:
Telescope: 8in Celestron Nexstar
Eyepieces:
Magnification:

 
   

Wolfgang Vollmann
Star: Struve 1918
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

STF1918 = WDS 15078+6307

Visually this unequal double was not very impressive at x35 and x115: the companion is simply too faint to make much of an impression. But it is a pretty double on my image!

Measure: STF1918AB: year 2006.57 / distance 17.8 arcsec / PA 19.3 deg




 
      
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