33 Doubles Observing Projects: Struve 1817

Struve 1817

Steve Bodin				sdbodin@hotmail.com
Star: Struve 1817 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				Tried for a conciderable time to find this star, as 1.6 sec should be easy. Then looked up the WDS current separation and found it to be 0.4 sec and gave up. Looked at the right one but all seemed single, will try the big scope next week.

Alessandro Bertoglio

alessandro.bertoglio@fastwebnet.it

Star: Struve 1817
Date & Time: 27 May 2005 21.29 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 Radian 3 mm.
Magnification: 1191X
Diagonal: Yes, Televue 2" Everbrite

Nothing with plossl 8 mm. Disappointed I go to read the actual separation (but not the PA). Surprise! In 2001 this star was measured 0.3"! How can I do? The seeing is not good, rings are visible but always moving. Hoping in some quiet moments, I change the eyepiece. Now the challenge starts! Surely it's the most difficult star I elongated since today: the star is faint and the turbolence disturbs very much but during a pair of quick quiet moments I can see hardly an elongated figure with extimated position angle about 345-350 degrees. Run to the computer looking for actual position angle. Wow! It's right! Into a faint almost round ring there is an elongated, like "8" shape, unsplitted double star. The difference of magnitude of the components is not great, the colour maybe white to yellowish. Well, another "hard core" pair in my collection.

Florent Losse				hfosaf@yahoo.fr
Star: Struve 1817 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				just a look at this magnificent single star ! Easy to locate when coming from stf1808.