SI 33 

Ilario Melandri
Star: SI 33 
Date & Time: 25 May 2000 – 23.36 UTC 
Seeing: 9 <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: 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) 
 
Note: the third component was not visible, and I think it’s fainter than 
m 10. 
 
 
 
 
Richard Harshaw
Star: SI 33 
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 (105x) 
 
 
Magnitudes:  5.9 (A1V), 6.1 (K1III) + 10.0 
Sep/PA's:  AB = 299 / 116 (both fixed), Bb = 152 / 267 (both fixed) 
Year of last measurement:  1962 
Distance (light years):  263 
Luminosity (in suns):  44.3 

This pair was far too wide to be of much interest, but it was bright and lies in a nice field. In fact, it looks a little like a large but poor open cluster.  Certainly as good as most of the Collinder clusters! 

Colors:  White, Orange (wow!), and White. 
 

 

 
 
Mary Flanagan
Star: SI 33 
Date & Time: 23 Jun 2000 04:55 UT; 22 Jun 11:55 CDT 
Seeing: 7 <1-10 Seeing Scale (10 best)> 
Transparency: 8 (1-10)  
Location of site: Apple Valley MN, USA 
 93d 14m 25s W; 44d 45m 17s N 
Site classification: Suburban   
Sky darkness: ~mag 4.5 at best <Limiting magnitude>  
Telescope: 8" f/6 Dobsonian 
Magnification: 37.5x 
 
 
Very wide pair; blue primary seemed a little brighter than orange 
secondary.  This one seemed a little _too_ easy; even my finder split it. 
When I checked the original list, sure enough . . . I'd forgotten to add the 
mag 10 C component to my database.  I'll put it first on my to-do list for the next clear night.