Struve 19 

Richard Harshaw
Star: Struve 19 STF 19 (HD 1223; SAO 53772; ADS 220) 
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): 03:30, Oct 17, 2000 
Site classification: suburban 
Sky conditions: 
seeing-- 8 out of 10 
transparency-- 7 out of 10 
limiting visual magnitude-- 4.5 mag 
Telescope: Celestron C-8 
Eyepiece: 7.4mm (280x) 
 
 		 Sep/PA's:  2.4 + / 141 + 
Year of last measurement:  1999 
Distance (light years):  454 
Luminosity (in suns):  28 
Eyepiece and magnification: 7.4mm (280x) 
Colors noted:  W and R. 

This pair was very difficult to split because the companion was so dim, and its red color did not help much in picking it out of the primary's glare. 
 
It is the top star of a large triangle of 7th magnitude stars. Nice field overall. 
I'd rate it a 3. 
 
 
 
Thad Robosson
Star: Struve 19 
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: 125x 
 		 Just the slightest hint of elongation, but not enough to confirm. I didn't attempt 250x,. as it was too faint and the higher mag. would only blur it more. 
 
I spent another 30 minutes enjoying some obvious views of the Double Cluster, The Pleades, Jupiter, and Saturn.  It's been a long summer for us here in Arizona, even the old timers were complaining how long the crud lasted this year.  It felt wonderful to get out, even if it was in my own backyard.  Of course, the club outing is tonite, and low and behold, Ma Nature cranked up her cloud machine after I packed it in.  Hopefully next Sat. will release the magic necessary for some great dark observing.... 
 
 
 

 
 
 
William L. Schart
Star: Struve 19 
Date & Time: 11/19/00, 7:34 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) 
 		 A very tight pair, the primary appeared blue and the secondary was too faint to tell. It popped in and out of view as I looked at it. This was too tough to attempt any measurement. 
 
Rating: 2. 

 
 
 
Ilario Melandri
Star: Struve 19 
Date & Time: 1 nov 2000 , 20.30 UT 
Seeing: 6 <1-10 Seeing Scale (10 best)>  
Location of site: Italy, Ravenna, San Romualdo, Lat 44 32’N Lon 12 08’E 
Elevation: 0 m 
Site classification: Rural  
Sky darkness: 4.5 <Limiting magnitude> 
Temperature: +9C 
Telescope: 150 mm f/15 achromatic refractor (lens by Romano Zen, Venice). 
Magnification: 140x (Plossl 16mm) 
 		  
 
 
 
William L. Schart
Star:  Struve 19 
Date & Time: 11/25/00, 8:00 pm CST 
Seeing: 6 <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, 144x, 240x		 This is located in a triangular asterism of theta, rho, and sigma. Not split at 32x, I suspected a bit of elongation at 48x, but not confirmed until I reached 120x. I also tried the barlow for 144x and 240x but the seeing wasn’t very good. The pair as a whole seemed B/W. 
 
Rating: 2 
 
 
 
Susan Delaney
Star: Struve 19 
Date & Time: 2000-12-27/28 19:00 - 22:00 EST (00:00 - 03:00 UT)
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Transparency: 8/10
Temperature: 26F
Location of site: Fairfield, CT, USA  
Site classification: Suburban   
Sky darkness: ~ 4.7 <Limiting magnitude> 
Telescope: Discovery 10" DHQ f/5.6 Dobsonian 
Eyepieces and Magnification: 9mm Nagler (158x)
 		 At 158x, no color was noted with both stars appearing white to my eye.