Struve 245 

Thad Robosson
Star: Struve 245 
Date & Time: 21, October, 2000 
Seeing: 7-8 <1-10 Seeing Scale (10 best)>. 
Location of site: Phoenix, USA 
Site classification: Decidedly Urban 
Sky darkness: 4 <Limiting magnitude> 
Temperature: about 70ºF 
Telescope:  90mm ETX MakCas 
Magnification: 39x, 83x 
 		 A rather faint pair, but easily spotted at 39x. Est. PA of 285°. Color not noted except maybe slight blue in comp. At 83x, the companion is a dull steel color, and both are much easier to view.  A nearly equal pair. 
 
 

 
 
 
Richard Harshaw
Star: Struve 245 
Location of site: Northern Kansas City, Missouri (USA) 
94d 30m west longitude, 39d 15m north latitude 
980 ft above Mean Sea Level 
Date of observations (UT): Nov 2, 2000 at 2330 
Site classification: suburban 
Sky conditions: 
seeing--  8 out of 10 (at times, approaching 9) 
transparency-- 7 out of 10 (high, thin and spotty clouds, taking perhaps 1magnitude from the starlight) 
limiting visual magnitude-- 4.0 mag 
Telescope: Celestron C-8 
Eyepiece: 20mm, 104x 
 
 		 Year of first measurement:  1830, 11.0 / 292 
Year of last measurement:  1993 
Distance (light years):  369 
Luminosity (in suns):  18 
Eyepiece and magnification:  20mm, 104x 
Colors noted:  yW and bW. 
I was struck by the seeming difference in hue, given that both stars are F3 V stars!  Nice color combination!  Webb saw them as Y, bW. 
Eggen found a 7.9 mag companion to A at only 0.2" in PA 146, but of course this was beyond my 8" scope. 
I rated the AB components a 2. 
 
 
 
Bill Reinehr
Star: Struve 245 
Date & Time: November 10, 2000, 01:30 UTC   
Seeing: 7+  (nearly full moon but still )< <1-10 Seeing Scale (10 best)> 
Location of site: Pflugerville, Texas, USA  (30 degrees N.) 
Site classification: Suburban  
Sky darkness: 4.0 <Limiting magnitude> 
Temperature: 50° F. 
Telescope: Vixen 80mm Fluorite, f/8  on Custom D altaz mount   
Magnification: 29x (22mm Vixen SW) & 36x (18mm Ultima) 
  
 		 Barely but cleanly split at 29x. Nicer at 36x.  The middle of a row of 3 stars of vaguely similar magnitude. No color noted. 
 
 
 
Jim Jones
Star: Struve 245 
Date & Time: 04:23 UTC, 11/16/00 
Seeing: 6 <1-10 Seeing Scale (10 best)> 
Location of site: Lake Oswego, Oregon  
Site classification: Suburban 
Temperature: 37ºF 
Sky darkness: 3.5 <Limiting magnitude>  
Telescope: 8 inch LX50 SCT 
Eye Piece(s): 42mm Ultima 
Magnification: 47x 
 
 
 		 Est PA without inst...300d 
Primary .....blue-white 
Companion.....yellow-white 
 
Companion seems dimmer than the 1 mag difference listed.  Set among a scattering of field stars including one yellow star of about mag 7 to North almost at edge of FOV. 
 
Also got in some practice time on the Micro Guide. Frozen fingers don't make it any easier to use.Did get it calibrated without a barlow and it seemed pretty consistent. Now I'll calibrate at 2x. 
 

 
 
 
 
William L. Schart
Star: Struve 245 
Date & Time: 11/19/00, 8:43 pm CST 
Seeing: 7 <1-10 Seeing Scale (10 best)> 
Location of site: Killeen, TX (Lat 31 N, Elev 600 ft) 
Site classification: Suburban 
Sky darkness: 4 <Limiting magnitude> 
Telescope: Orion 6" Dob 
Magnification: 32x, 48x, 72x, 120x, 98x (Microguide) 
 		 Although a wider pair than 249 it proved tougher for me to find, perhaps due to me getting all confused. At 32x I suspected duplicity, but couldn’t confirm. At 48x I got a definate split. At 72x both appeared to be blue with one slightly brighter than the other. 
 
Separation 13”, PA 290d. Rating 3 

 
 
 
Thomas Jensen 
Star: Struve 245 
Date & Time: 30/11-2000 
Seeing: 9 (small aperture) <1-10 Seeing Scale (10 best)> 
Location of site: Denmark, EU 
14 57' E, 55 deg 12' N 
Site classification: Rural 
Sky darkness: 5.5 <Limiting magnitude> 
Observing conditions: sligthly hazy, very sligth breese 
Telescope: 50/880mm Zeiss apo  
Magnification: 34x, 52x 
 		 This one was much more difficult than 56 And. At first I couldn't see it with 
34X, so I upped the mag to 52X ( 17mm Plössl ). After a careful refocus I could just make it out with averted vision. Subsecuently I could also see it with 34X. Neither star showed any color. 

It was a clear nigth ( sort of ) at last. Yesterday 30/11-2000 the sky cleared nicely during the afternoon. I got a fine glimpse of the Moon and Venus, from the barn, as they played Hide-and-seek with a tree. 
 
I hoped that the sky would remain clear for at least a few hours after dinner. It did, but it was quite hazy with some drifting clouds. Anyway, I took out my 50/880mm Zeiss apo and took a good look at Saturn ( see Telementor eGroup ) and then some And doubles. 
 
 
 
Bob Hogeveen
Star: Struve 245 
Date & Time: December 30, 2000  21.00->23.30 UTC+1  
Seeing: -- <1-10 Seeing Scale (10 best)>. 
Location of site: Annen, The Netherlands (53 N, 6 E) 
Site classification: Village-backyard  
Sky darkness: 4.5 <Limiting magnitude> 
Conditions: Now and then some clouds
Temperature: -2ºC
Telescope: Meade LX10 (8" SCT)
Eyepieces: TV 40mm, Meade 25mm, TV 20mm, Vixen LV 7mm
 		 Best view with 50x. I couldn't see any color in these stars although Richard calls them Y! and B! in his record. I have to check this one out another time...
Rating : 3