33 Doubles Observing Projects: Struve 1806

The difference in magnitude is tiny but perceptible. The 13 seconds separation is obvious with this configuration of observation. For colourings, they are white for the two components. For Lionel, the secondary shows red reflections. The principal star is of logically yellow F5 type thus of colour:) 10 stars are visible in the field of this eyepiece indicating and confirming perceptible magnitude 4 with the naked eye for this site of observation (for recall, Noisy le Grand 2,5). The components are thus weak on the level magnitude and not easy to see (mag 10) but the bringing together of these two stars and the close magnitudes make a star of it be re-examined. It is necessary that I test with my material (Nexstar 8) and my sky (Noisy le Grand ).

Tim Leese				TimJLeese@ukgateway.net
Star: Struve 1806 Date & Time: `14 May 2005,` 23:10 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-----Once again a nice view using the 30mm Ultima but I couldn't decide which star was the target. Patience prevailed as a candidate became obvious in moments of steady air. The higher magnification confirmed the suspect but the companion was very faint, drifting in and out of vision. Averted vision showed it well though. No colours detected. Two stars could be seen following.

Alessandro Bertoglio				alessandro.bertoglio@fastwebnet.it
Star: Struve 1806 Date & Time: 26 May 2005 20.24 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				Pretty easy but rather faint pair with components quite but nonexcessively distant. Primary star sifficiently bright, whitish to yellowish. Secondary pretty faint but still visible with direct vision, yellow to orange. No visible rings. Extimatd AP about 175 degrees. Quite anonymous double under this observing conditions.

Louis Marchesi				lmarchesi@yahoo.com
Star: Struve 1806 Date & Time: 29 May 2005 3:17 UTC Seeing: Pickering 3 Transparency: Below Average Location of site: New London Township, PA, US (+39d45m,-75d52m) Site classification: Suburban/Rural Conditions: Clear, calm, heavy dew, 10C (50F) Sky darkness: Not determined Moon: None Telescope: TMB152 f/7.9 Apochromatic Refractor Mount: Losmandy G-11 Eyepieces: Baader Mark V Binocular Viewer with 1.25x Glaspath Compensator TMB Super Monocentrics 14mm Magnification:107x				Both stars were white. This pair was a bit difficult, despite the generous separation of the components. I think the lack of transparency made seeing the 11th-magnitude B star a bit more of a challenge tonight than it would be on a better night.

Steve Bodin				sdbodin@hotmail.com
Star: Struve 1806 Date & Time: 27 May 2005, 10pm to midnight Seeing: 4-5/10 Transparency: fair Location of site: Silverdale Wa, USA, 47N,123W Site classification: Suburb Conditions: 60F, no wind, dry Sky darkness: limiting mag 5.6 Moon: Telescope: Celestron C8 Eyepieces: not used Imaging: DX8263SL video camera at prime focus, f10 Magnification: app. 333x				Pair of dim blue stars, had to integrate the videocamera x8 to see them. Not to mention the difficulty finding in my two inch finder, many faint stars. Measured, 13.87 sec at 171.1 deg PA.

Morgan Spangle				msfainc@optonline.net
Star: Struve 1806 Date & Time: May 29-30, 2005 Seeing: 4/5 Transparency: 2/5 Location of site: Larchmont, NY 40 55N 73 44W Site classification: Conditions: steady, calm, high haze, passing clouds Sky darkness: Telescope: Borg 101ED fl: 640mm CCD Camera: ST237A, 2.39 pixels/arcsec FOV 25 x 19' Eyepieces: Magnification:				12.7" - 172.5 DEG

Jean Louis Badin / Lionel Alphonse				jeanlouis.badin@laposte.net
Star: Struve 1806 Date & Time: 14 june 2005 23:00 UTC Seeing: III Danjon Transparency: Location of site: Noisy le Grand - France 48°51 N 2°33 E Site classification: Urban area with strong light pollution Conditions: sky veiled with clouds of high altitude.. Moon: slept :) Sky darkness: 4 (limiting magnitude) Telescope: LX 200 GPS 254 mm / 2500. Mount: count equatoriale Meade. Eyepieces: Nagler 17 mm Type 4 2 inches Magnification: 149 X Diagonal: Yes, Televue 2" Everbrite with reducer of diameter.				The difference in magnitude is tiny but perceptible. The 13 seconds separation is obvious with this configuration of observation. For colourings, they are white for the two components. For Lionel, the secondary shows red reflections. The principal star is of logically yellow F5 type thus of colour:) 10 stars are visible in the field of this eyepiece indicating and confirming perceptible magnitude 4 with the naked eye for this site of observation (for recall, Noisy le Grand 2,5). The components are thus weak on the level magnitude and not easy to see (mag 10) but the bringing together of these two stars and the close magnitudes make a star of it be re-examined. It is necessary that I test with my material (Nexstar 8) and my sky (Noisy le Grand ).