Struve 1794

Tim Leese
Star: Struve 1794
Date & Time: 11 May 2005, 23:30 UT
Seeing: 7-6 <1-10 Seeing Scale (10 best)>
Transparency:  <1 worst - 10 best>
Location of site: Northwich, Cheshire. UK.
(53° 15' N -2º 33' W).
Site classification: Suburban
Sky darkness:  <Limiting magnitude>
Conditions: High haze drifting by from time to time, Moon, nice view.
Telescope: 200mm f/6 Newtonian reflector
Mount: Vixen GP
Eyepieces: 30mm Ultima, 9mm Orthoscopic, 5mm Lanthanum.
Magnification: X40, X133, X240
 
9mm Or-----------After a search for the correct double, I found it difficult to split at this magnification. Even increasing the magnification with a barlow didn't seem to help much either.
 
5mm Lanthanum---------This eyepiece gave the best view splitting this double into two white stars. Difficult to visually determine any PA but the stars appeared to lie on a 120-300 degree line.


Alessandro Bertoglio
Star: Struve 1794
Date & Time: 24 May 2005 21.49 UTC
Seeing: III - IV Antoniadi
Transparency:
Location of site: Turin, Italy, 4504N 0742E
Site classification: Urban area with strong light pollution
Conditions: clear, no wind, mild temperature
Moon: pretty fastidious full moon
Sky darkness: 3 (limiting magnitude)
Telescope: Takahashi Mewlon 300, Dall-Kirkham 300/3572 reflector
Eyepieces: Televue Plossl 8 mm.
Magnification: 447X
Diagonal: Yes, Televue 2" Everbrite
 
Seeing seams getting slightly worse. This pair is comparable with the previous (Struve 1792) but it is gently easier because, although slightly narrower (but I'm not so sure), it's fairly brighter. Primary whitish, sufficiently bright and secondary with the same colour and magnitude (extimated difference about 0.1-0.2 mag.) splitted only during the quiet moments. No rings. Extimated PA about 110 degrees (maybe it changed its position from the last measurement). Difficult but interesting, well suited for medium telescope.
 

 
 
    

Florent Losse
Star: Struve 1794
Date & Time: May 25-26th, 2005
Seeing: 4/10
Transparency: very good
Location of site: St Pardon de Conques, France 4433N 0012W
Site classification: Rural
Sky darkness: m=6+
Telescope:
- visual : T115, guidescope suited with a 20mm eyepiece (G=45x)
- imaging : homemade Newt T200, Barlow 3x, Audine K400 (sampling 0"43/px)
Reductions: done with a future release of Reduc.
Eyepieces: 20mm
 Magnification: 45x

 Not splitted in the guidescope. Difficult to image with this bad seeing. Measurements 125°2  /  1"75
 

Stev
Steve Bodin
Star: Struve 1794
Date & Time: 26 May 2005, 10pm to midnight
Seeing: 5-6/10, degrading to 4/10
Transparency: fair
Location of site: Silverdale Wa, USA, 47N,123W
Site classification: Suburb
Conditions: 55F, no wind, dry
Sky darkness: limiting mag 5.6
Moon:
Telescope: Celestron C8
Eyepieces: not used
Imaging: DX8263SL video camera at prime focus, and 3x
Magnification: app. 333x, 1000x

 Almost identical to STF1792, but the primary and secondary are reversed.
Measured, 1.99 sec at 120.8 deg PA.
 

 


 

 
(c) 1998-2005 The Spirit of 33