Otto Struve 145 

Philippe de Jocas 
Star: Otto Struve 145 
Date & Time:  20/01/2001 
Seeing: ~6/7 <1-10 Seeing Scale (10 best)>. 
Location of site: Ottawa Valley, Canada 
Site classification: Suburban  
Sky darkness: 4.5 <Limiting magnitude> 
Temperature: -15ºC 
Conditions: Sky a bit hazy 
Telescope: 6" f5 newtonian 
Magnification:  up to 355x 
 		 Though I tried everything I knew, and pushed the power to 355x, O.S. 145 resisted to the bitter end, and I never even saw a hint of its companion. 

 
 
 
Susan Delaney
Star: Otto Struve 145 
Date & Time: 2001-01-31, 02:00 - 03:00 UT 
(21:00 - 22:00 EST) 
Seeing: 4 <1-10 Seeing Scale (10 best)>. 
Transparency: 7/10 
Temperature: 31º F (-5º C) 
Location of site: Fairfield, CT, USA  
Site classification: Suburban   
Sky darkness: ~ 5 <Limiting magnitude> 
Telescope: Discovery 10" DHQ f/5.6 Dobsonian 
Eyepieces and Magnification: 7.5mm Plossl (190x), 12.5mm Plossl (115x) 
 		 190x revealed a white primary accompanied by a bluish companion. 
 
 
 
 
 
Ilario Melandri
Star: Otto Struve 145 
Date & Time: 2 February 2001 ? 20.09 UTC 
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: 3.5 <Limiting magnitude> 
Temperature: -2ºC 
Telescope: 150 mm f/15 achromatic refractor (lens by Romano Zen, Venice). 
Magnification: 250 x (eyepiece OR 9 mm) 
 		 Note: very hard to split. 
 
 
 
 
Eddy O'Connor
Star: Otto Struve 145 
Date & Time: 11p.m local; UT +11 
Sunday, February 18th  2001 
Seeing: 7 <1-10 Seeing Scale (10 best)> 
Transparency: 9 
Temperature: 17ºC. Calm 
Location of Site: Terara, New South Wales, Australia, Long.150.38 degrees; South 34.52. 
Site Classification: Suburban 
Sky darkness: -- <Limiting magnitude> 
Moon: No Moon 
Instrument: 8" Newt. F9 
Magnification: 144x 
Eyepieces: 25mm Kelner and 12.5mm Orthoscopic 
Harshaw Scale: 3 (1-5, 1 best) 
 		 This is an easier star to locate as it is close in the field to a binocular or       finder double. Like the previous two, Gamma is the start of the star hop. 

Comment: This is a difficult star to split and I could not detect any difference in colour. X144 just managed a thin thread of darkness between this double 
 
 
 
Giuseppe (Pino) Bandini
Star: Otto Struve 145 
Date & Time: 10 February 2001 - 23.10 UTC 
Seeing: 8 <1-10 Seeing Scale (10 best)> 
Location of site: Ravenna, Italy. 0 mts Altitude 
Site classification: Urban  
Sky darkness: -- <Limiting magnitude>  
Temperature: 9ºC 
Telescope: Celestron 8 
Magnification: 80 x (Plossl 25 mm)