Struve 1804

Tim Leese
Star: Struve 1804
Date & Time: 14 May 2005, 22:45 UT
Seeing: 7 <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: Clear with a little high haze, twilight. Moon, nice phase
to observe.
Telescope: 200mm f/6 Newtonian reflector
Mount: Vixen GP
Eyepieces: 30mm Ultima, 9mm Orthoscopic, 5mm Lanthanum.
Magnification: X40, X133, X240
 
9mm Or----------I had trouble to say that I could split STF 1804 into two stars using the 30mm Ultima. However, some very faint field stars gave a nice view all the same. Using the higher magnification though, I could see the two stars nicely separated. The primary appeared yellowish with perhaps a pale blue(?) companion. Visual estimate of PA was 20 degrees.


Steve Bodin
Star: Struve 1804
Date & Time: 24 May 2005, 10pm to midnight
Seeing: 2/10 improving to 5/10
Transparency: fair
Location of site: Silverdale Wa, USA, 47N,123W
Site classification: Suburb
Conditions: 55F, no wind, damp
Sky darkness: limiting mag 5.6
Telescope: Celestron C8
Eyepieces: not used
Imaging: DX8263SL video camera at prime focus, f10, and 3x
Magnification: app. 333x and 1000x

 Close unequal mag pair for poor conditions, but split by using the
videocamera 2x zoom feature. Measured, 4.89 sec at 016.8 deg PA.
 

 

 

    

Alessandro Bertoglio
Star: Struve 1804
Date & Time: 26 May 2005 20.17 UTC
Seeing: IV Antoniadi
Transparency:
Location of site: Turin, Italy, 4504N 0742E
Site classification: Urban area with strong light pollution
Conditions: clear, no wind, mild temperature, little hazy
Moon: none
Sky darkness: 2.5-3 (limiting magnitude)
Telescope: Takahashi Mewlon 300, Dall-Kirkham 300/3572 reflector
Mount: 10 Micron GM2000 with FS2 controller
Eyepieces: Televue Plossl 15 mm.
Magnification: 238x
Diagonal: Yes, Televue 2" Everbrite

 An easy pair sufficiently bright and pretty close. Primary star whitish maybe with very slight bluish hue. Secondary fairly fainter (the extimated difference is about 0.5 mag, not more) orange.

No visible rings. Exitimated PA about 10 - 15 degrees. A pretty interesting
double particularly cause it's fine color contrast.


 
 
    

Florent Losse
Star: Struve 1804
Date & Time: May 27-28th, 2005
Seeing: 6/10
Transparency: Good, thin clouds running
Location of site: St Pardon de Conques, France 4433N 0012W
Site classification: Rural
Conditions:
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

 Well, well. Nice view in the 115/45x. Orientation is well seen permanently and a nice peanut by times. Measurements give 015°3 / 4"66
 
Ambiance : again a scorching day. Nothing good for the first part of the night, the sky is very clear at sunset but the seeing is horrible. Observations begin at 02h00 local time when thin clouds begin to run from west.
 


Louis Marchesi
Star: Struve 1804
Date & Time: 15 June 2005 2:57 UTC
Seeing: Pickering 5
Transparency: Average
Location of site: New London Township, PA, US (+39d45m,-75d52m)
Site classification: Suburban/Rural
Conditions: Clear, calm, very warm, very humid (almost foggy), the scent of honeysuckle is in the air, 25C (77F)
Moon: 8 days (49% illuminated)
Sky darkness: 3.5 (limiting magnitude)
Telescope: TMB152 f/7.9 Apochromatic Refractor
Mount: Losmandy G-11
Eyepieces: TMB Super Monocentric 5mm
Magnification: 150x
     
I have to say that unequal pairs are definitely my favorites to view. This pair in particular, surprised me somewhat because the fainter systems usually do not exhibit any color that I can detect. Struve 1804 was somewhat faint; the A star was yellow and the B star was red. The stars were split with relative ease at this magnification.
     
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