Otto Struve 358 

Richard Harshaw
Star: Otto Struve 358 
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): 29 May, 2000; 0330 hours 
Site classification: suburban 
Sky conditions: 
Seeing--  8 out of 10 (long periods of 10!!) 
Transparency-- 8  out of 10 
Limiting visual magnitude-- 4.5 
Telescope: Celestron C-8 
Eyepiece: 20mm Erfle (104x) 
 
 		 Magnitudes:  6.2 (G2V), 7.2 (G2V), 8.0 
Sep/PA's:  AB = 1.6/158 (sep increasing, PA decreasing), AC = 201/234 
Year of last measurement:  1991 
Distance (light years):  112 
Luminosity (in suns):  4.6 

As a testament to the incredible seeing tonight, I was able to get distinct black sky between A and B at 105 x with a diffraction mask!!  The AB pair is a beautiful sight when split with powers this low. 

I noted colors of Yellowish-white, Yellow, and White. 
 
 
 
 
John M. Ryan
Star: Otto Struve 358 
Date of Observation: 5/30/00 22:45UT   
Location of Observation: Ciudad Rodrigo, Salamanca, Spain 
40º 36' N, 6º 32'W, Elev. 800 Meters 
Seeing: 4 to 5 (1 - 10, 10 best) 
Transparency: 6 to 7. 
Limiting Mag. (naked eye): 4 
Site classification: Urban 
Instrument: Meade 8"SCT 
Magnification: 117X and 167X		 Separation (Clear or Touching):Clear all three. 
Magnitude Comment: Two close ones bright, needed averted vision to get the dimmer component. 
Color Comment: All white. 
 
General Comment: It seemed that the sky settled down on this one because I had a close split of the two brighter components. I could just make out a thin strip of sky between them but they were dancing. 

 
 
 
Paolo Morini
Star: Otto Struve 358 
Date & Time: 3 June 2000 – 21 UTC 
Seeing: 8 <1-10 Seeing Scale (10 best)> 
Location of site: Ostellato, Ferrara, Italy. 
Site classification: Rural 
Sky darkness:  5.5 <Limiting magnitude> 
Temperature: +15C 
Telescope: Takahashi FS102 
Magnification: 235x (eyepiece OR7 + barlow 2x) 
  
  
 		 a long and finally succesful star-hopping. Very fine and delicate 
pair. Not searched for the third component, too much tired in finding the main double. 
 
 
 
 
Ilario Melandri
Star: Otto Struve 358 
Date & Time: 8 June  2000 – 22.04 UTC 
Seeing: 8 <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: 18C 
Telescope: 150 mm f/15 achromatic refractor (lens by Romano Zen, Venice). 
Magnification: 140 x (eyepiece Clave Plossl 16 mm) 
 		  
 
 
 
Eddy O'Connor
Star: Otto Struve 358  
Date & Time: Wednesday, June 29th 2000
10 -11p.m local; UT +10
Seeing: 5-6/10 <1-10 Seeing Scale (10 best)> 
Transparency: 7/10
Temperature: 7ºC, Light breeze.
Location of Site: Terara, New South Wales, Australia, Long.150.38 degrees; South 34.52. 
Site Classification: Suburban
Sky darkness: Northern sky to mag. 4.5; Southern to
5.5 <Limiting magnitude> 
Instrument: 8"  F9 Dobsonian 
Magnification: 72x (25mm K)
 		 I was surprised to split this star so easily at low power. I found the primary whitish and no colour noted in close companion. The third star is widely separated.