Otto Struve 457

 
Steve Bodin
Star: Otto Struve 457
Date & Time: Visual on 27 July,
Imaged on 3 Aug
Seeing: 7 <1-10 Seeing Scale (10 best)>
Transparency: fair
Location: Silverdale WA, USA
47N,123W
Site classification: rural, suburb
Sky darkness: 5.5 <Limiting magnitude>
Telescope: 4 inch Meade SC, C8, 17 DOB
Eyepieces: 10mm homebuilt, 7mm ortho
Magnification: 100x, 142x
Additional: PC164C Video camera		 I think the DI for this pair must be a 101 on 100 scale. Not seen in the 4 inch, only a somewhat yellow-white primary. Tried to image this star on the 21st and 24th of July with no success. The 2 plus magnitude at 1 sec is just too tough. Finally, by hand picking 20 images out of 200 did a faint secondary spot come out of the video noise from the imaged data of 3 August. Measured with the C8 and 3x teleconverter: 1.13 sec at 241.7 deg PA.






 

 
Bob Hogeveen
Star: Otto Struve 457
Date & Time: Aug 13, 2002 (23.00) 
Seeing: 6 <1-10 Seeing Scale (10 best)>
Transparency: 7 <1-10, 10 best>
Location of site: Annen, The Netherlands,
53N, 6E 
Site classification: Village backyard 
Sky darkness: End of twilight 
Moon: no moon
Conditions: 
Telescope: C11
Eyepieces:: Vixen LV 7mm 
Magnification: 400x
Harshaw Scale: 3 <1-5; 1 best>

 

 Situated right in the middle of Cepheus' belly and easy to find thanks to the bright primary.
After locating it I immediately put the 7mm ep in and it proved the right choice. @ 400x the secondary showed up during better moments of seeing. The image was very unstable, but when settling down for short moments the pair was very well visible. Going back to 280x didn't work, nothing could be seen of the secondary at that magnification. 

 
Inge Skauvik
Star: Otto Struve 457
Date & Time: 18.Aug.02 0100 - 0230
Seeing: 8 <1-10 Seeing Scale (10 best)>. 
Transparency:  Poor/moderate
Location of site: Haavik, Norway
Site classification: Suburban
Temperature: +15º C
Sky darkness: 5.0 <Limiting magnitude> 
Conditions: Wind 2 - 8 m/s from the south
Telescope: 8-inch Portaball with Zambuto mirror
Mount: Dobsonian type
Eyepieces: 16 mm Konig, 7 mm Ortho, 5 mm
Ortho, 2.8x Klee Barlow (all > University Optics)
Magnification: 240x / 480x 
   		 The orientation of this pair was almost east-west, the faint companion star was leading. The pair could easily be overlooked, and 480x power was needed to split the pair definitely. I suspect the separation to be a bit larger than 1"3, perhaps 1"6. Bright star white, companion appears bluish.
 
 
 
 
 
 
 
 

 

 
William L. Schart
Star: Otto Struve 457
Date & Time: 18 August, 2002,
Seeing: 7 <1-10 Seeing Scale (10 best)>
Transparency:  <1-10, 10 best>
Location of site: Killeen, TX, USA
Site classification: Suburban
Sky darkness: ~4 <Limiting magnitude>
Telescope: Celestar 8" SCT
Eyepieces: 25, 17, 10 mm 
Magnification: 		 A challenging pair with a DI of 92.6. Just a hint of elongation at low power which was more noticable at mid power. At high power I was able to make out the faint companion - a tiny dot just off the main component. The primary was white, and not much could I tell about the color of the companion. The FOV was otherwise rather sparse.

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