Struve 991


 
Ilario Melandri
Star: Struve 991 
Date & Time: 2 February 2001 ? 20.29 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: 3rd component is very hard to glimpse. 
 
 
 
 
 
Thad Robosson
Star: Struve 991 
Date & Time: 2/16/01, 03:00UT (2/17) 
Seeing: 6 <1-10 Seeing Scale (10 best)> 
Transparency: 4/10 
Location of site: Phoenix, USA 
33º 32.674N, -112º 08.029W 
Site classification: Decidedly Urban 
Sky darkness: -- <Limiting magnitude> 
Temperature: In the mid 60's (F) 
Telescope: 8"f/6 newt on an EQ mount  
Eyepieces: Vixen Lanthanum 10,15mm, 
Meade Super wide 32, 20mm 
Apogee 2x shorty barlow. 
Magnification: 120x 
 		 B comp is at near 170°, and C around 210°.  No colors noted. 
 
Ambiance: City noise, Traffic noise, airplane noise, Etc 
 

 
 
 
Bob Vickers
Star: Struve 991 
Date & Time: 1/26/01 0249 UT 
Seeing: 8 <1-10 Seeing Scale (10 best)> 
Transparency: 7 
Location of site: Huntingdon, Tennessee, USA 
~ 35d 57m N, 88d 23m W 
Site classification: Rural  
Sky darkness: 5.5 <Limiting magnitude>  
Conditions: Slight breeze from SW 
Temperature: 10ºC 
Telescope: 12.5" Orion Newtonian reflector 
on Dobsonian mount 
Magnification: 38x, 59x, 122x, 254x 
Eyepiece(s): Sirius Plossl 40mm, 26mm, 12.5mm, 6.3mm 
 		 A more difficult hop from Epsilon Gem through a nice little W (or M) shaped 
asterism to 37 Gem and neighboring Struve 991. A and B just touching at 59x but cleanly split at 122x. Dimmer C located from position angle and distance. A and B both appear yellowish-white. I could not discern any color in C. 
 

 
 
 
 
Giuseppe (Pino) Bandini
Star: Struve 991 
Date & Time: 11 February 2001 - 18.37 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: 10ºC 
Telescope: Celestron 8 
Magnification: 125 x (Plossl 16 mm)