Struve 2905
Richard Harshaw 
Star: Struve 2905
Date & Time: September 5, 2001,
0230 to 0510 UT
Seeing: 6 <1-10 Seeing Scale (10 best)>
Transparncy: 6 to 7 (variable, due to high hazy clouds) <1-10 Seeing Scale (10 best)>
Location of site: Northern Kansas City,
Missouri (USA). 39º15' N, 94º30'W
980 ft above Mean Sea Level
Site classification: suburban 
Sky darkness: -- <Limiting magnitude>
Telescope: Celestron C-8, C-11
Magnification: 112x, 311x
Harshaw Scale: 4 <1-5; 1 best>
ADS 15950
Position:  2227+1509  Rating:  4
Components:
 A:  8.9m, G5
 B:  9.2m, 4 +” @ 281 - 
Year of last AB Measure:  1977
Distance (l.y.): 81, Luminosity (Suns): 0.25
Observed colors:  Y, Y 

Observations: Observed at 311x.  Split at 112x, but better view at 311.  Both looked W this time around.

Notes: Hipparchos/Tycho data show different distances for these stars; they may be an optical system.
First measure 3.3" @ 284.
 


 
John M. Ryan
Star: Struve 2905
Date & Time: 11 Sept 2001 ( 21:45 UT)
Seeing: 6+ <1-10 Seeing Scale (10 best)>
Location of site: Barreras, Salamanca, Spain.
Site classification: Rural,Suburban.
Conditions: fairly dry but with gusts of wind.
Sky darkness: 5+ <Limiting magnitude>
Telescope: Meade 8" SCT mounted on a Losmandy GM8.
Eyepieces: 12mm plossl, 7mm ortho & 6mm ortho
Magnification: 167X, 286X & 333X 
Harschaw's Escale: 3 <1: Excellent, 5: Poor>
This is an exact twin of  STF 2901 and the procedure and the results were the same; at 167X I had a nice figure eight; went up to 286X and got a nice split but the view was better at 333X. Nice close double, both white.
 
 
 
 
 
 
 

 

 
 
Jim Phillips
Star: Struve 2905
Date & Time: Oct. 4, 2001, 8:00-9:15 EDT
Seeing: 7 <1-10 Seeing Scale (10 best)>
Location of site: Charleston, South Carolina, USA
Site classification: Suburban.
Temperature: 70ºF
Sky darkness: --- <Limiting magnitude>
Telescope: AP 155 F/7 Apochromat
Magnification: ---
   
Tiny white jewels. Good with 25 and 16 mm.