Otto Struve 494

 
Richard Harshaw 
Star: Otto Struve 494
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: 311x
Harshaw Scale: 2 <1-5; 1 best>
HD Number 220076
ADS 16686
Position:  2321+2157  Rating:  2
Components:
 A:  7.7m, F0
 B:  9m, 3” @ 84 
Year of last AB Measure:  1967
Distance (l.y.): 780, Luminosity (Suns): 52
Observed colors:  W!, O! 

Observations: Observed at 311x.  W and W or bW.  Nice pair, but dim.

Notes: First measure:  3.3" @ 84.

 


 
Jim Jones
Star: Otto Struve 494
Date & Time: 09/07/01   0630 UTC
Seeing: 5 <1-10 Seeing Scale (10 best)>
Location of site: Lake Oswego, Oregon
Site classification: Suburban
Sky darkness: 4.0 LM
Sky:  Full moon + 5 days.
Telescope: 8" LX50
Eye Pieces:  18 mm Radian
Magnification: 112x
Est PA without inst....090d
Color....blue-white
Clear split at 112x

The double is set in a slightly elongated Cassiopeia shaped asterism.  Another bright star to the north and 3 dimmer stars to the south.
 
 
 
 
 
 
 

 


 
Jim Phillips 
Star: Otto Struve 494
Date & Time: Oct. 15, 2001
Seeing: 6 <1-10 Seeing Scale (10 best)>
Location of site: Charleston, SC, USA
Site classification: Suburban
Temperature. 72º F.
Sky darkness: --- <Limiting Magnitude>
Telescope: 9" F/15 apo
Eye Pieces: ---
Magnification: ---
Very nice equal pair. 
 
 
 
 
 
 
 

 

 
 
Stuart Clough
Star: Otto Struve 494
Date & Time: 28.10.01 2110 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
Magnification: x133
   
About the same listed separation as STF 3000 observed immediately previously, this 
object split easily at x133, simply, I suppose, because its greater level of brightness against the moonlit sky made it much easier to see. A nice pair in an uninteresting field.
  
Seen as white primary, pale blue comes.