Struve 2990

 
Richard Harshaw 
Star: Struve 2990
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: 560x
Harshaw Scale: 3 <1-5; 1 best>
ADS 16602
Position:  2313+2205  Rating:  3
Components:
 A:  8.2m, F2
 B:  8.5m, 2 +” @ 58 -!! 
Year of last AB Measure:  1974
Distance (l.y.): 650, Luminosity (Suns): 33
Observed colors:  Y, Y 

Observations: Observed at 560x.  W and W.  PA does not look like 58.  Looks more like 75 to 80.

Notes: First measure 1.6" @ 69.  1912 (Bowyer), 1.7" @ 244.

 


 
Jim Phillips
Star: Struve 2990
Date & Time: Oct. 15, 2001
Seeing: 6 <1-10 Seeing Scale (10 best)>
Location of site: Hodges, South Carolina, USA
Site classification: Suburban.
Temperature: 72ºF
Sky darkness: --- <Limiting magnitude>
Telescope: AP 9" F/15 Apochromat
Magnification: 214x
 
Perfect tiny white jewels. 214X.
 
 
 
Stuart Clough
Star: Struve 2990
Date & Time: 28.10.01 2125 UT
Seeing: 6 <1-10 Seeing Scale (10 best)>
Location of site: Near Halifax
West Yorkshire, England.
Site classification: Suburban
Temperature: 8ºC
Sky darkness: 3.0 (U Mi) <Limiting magnitude>
Conditions: Variable cloud, Wind SW 12/15kts
Telescope: Orion Optics UK GX250
10"  f4.8 Newtonian on Vixen GP mount.
Eyepieces: 9 mm Ortho, 7.5mm Plossl, x2 Ultima Barlow
Magnification: x133, x160, x267, x320.
   
Possible elongation was noted at x160, and this was certainly present at x267. At x320 the image only focussed during moments of best seeing, but at these times a  clean split was seen briefly at what appeared to be close to the published P.A. The overall impression of colour was white. 

The bright very gibbous moon was a factor in what could be observed.