Otto Struve 303

 
Steve Bodin 
Star: Otto Struve 303
Date & Time: 8 and 10 May 2003 11 pm to 1 am
Seeing: 3/10 on 8 May 6/10 on 10 May
<1-10 Seeing Scale (10 best)>. 
Transparency: poor
Location of site: Silverdale WA, USA
47N 123W
Site classification: suburb-rural
Conditions: temp 40F, damp
Sky darkness: mag 4.5 due  moon <Limiting magnitude> 
Telescope: Celestron C8
Eyepieces: not used
Additional: DX-8263SL video camera at prime focus and 3x
Magnification: app. 333x, 1000x		 Close pair, but split well at 3x magnification on the 10th. Rated as 'almost easy', what ever that means. Primary an off-white and the secondary an off-blue, is that a color? Anyway, measurements; 1.49 sec at 185 deg PA.


 
 
 
 
 
 
 

 

 
Eddy  O'connor
Star: Otto Struve 303
Date & Time: May 30th 2003. 
10.30 - 11.30 p.m local; UT +10
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Transparency: 8 <1 worst - 10 best> 
Location of site: Terara, New South Wales,
Australia, Long.150º.38 ; Dec. S 34º.52
Site classification: 
Temperature: 14ºC
Sky darkness:  <Limiting magnitude> 
Conditions: High humidity. No Moon
Telescope: 8" Newt. F9
Eyepieces: 25mm K, 12.5 mm Ortho
Magnification: 
Harshaw Scale: -- <1-5: 1 best>
 		 Mag. 7.72/8.12; Sep. 1.5". I failed to split this at any power. A neat but faint wide double is present in the same field at low power. Interestingly, Otto Struve catalogues this star, 
although it sits in the small arc of stars where his brother listed STF 2000 16 years earlier. Sky Cat. 2000 give the Sep. as 0.6" and the magnitudes as 7.5/8. (Are we opening or closing here, my hawk-eyed hearties?)
 
 

 

 
William L. Schart
Star: Otto Struve 303
Date & Time: 7th, June, 2003
Seeing: 7 <1-10 Seeing Scale (10 best)>
Transparency: --- <1 worst - 10 best>
Location of site: Killeen, TX
Site classification: 
Sky darkness: 3.5 <Limiting magnitude>
Conditions: Clear sky
Telescope: Celestron C8
Eyepieces: 25mm, 17mm, 10mm,
12.5mm CMG.
Magnification: 80x, 160x 
 

 

 The tightest pair from the list I have looked at to date. Elongated at low power, split at mid power. I tried my high power, but the view wasn’t much better than the mid. I made them as blue and they lie pretty close to the N/S line, with the slightly dimmer member to the S. In the same FOV to the west was another couple of stars, perhaps around 30" apart and roughly N/S too. I think these are SAO 101850, and 101856 and thus are just an optical pair.
 
 
 
 

 
 
 
John M. Ryan
Star: Otto Struve 303
Date & Time: 17:06:2003, 11:15 local time
Seeing: 6 <1-10 Seeing Scale (10 best)>
Transparency: Fair to good
Location of site: Barreras, Salamanca, Spain
Site classification: Rural
Sky darkness: 7 <Limiting magnitude>
Transparency:  <1 worst - 10 best>
Conditions: Temp. 25ºC, Light wind
Telescope: Celestron 9.25" SCT
Eyepieces: none
Magnification: Stella Cam Ex video camera, 
4X Telemate with 2X Zoom for overall of 8X
   		 The video camera is black and white so no color can be noted. This double consists of two components almost equal in magnitude. Close split noted on laptop screen. The final result is an average of five measurements. Theta = 172.5º and rho = 1.46"
 

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