150mm MCT f/13, 31% CO
"People say I'm in denial. I disagree."
Used acronyms: NEML=Naked Eye Magnitude Limit, SQM=Sky Quality Meter, TML=Telescope Magnitude Limit, CO=Central Obstruction, delta_m=difference in magnitudes between double star components, RoT=Rule of Thumb, pD_mm=proposed D_mm for resolving a binary (ident with earlier used pA=proposed Aperture), D_mm=Diameter (of scope) in mm, UCAC4=USNO CCD Astrograph Catalog 4th edition
DJ Eastern Missouri, USA Bushnell 8x42's, SV80ed, Nexstar 130SLT, C5+, 8" LX200 Classic, 10" f/7 Cave, Orion XT10 w/Moonlite focuser
Quote:Glancing back at the sketch, I realize for some reason the companion's rings are inside the primary's first minimum. That's a mistake, I thought I blacked them out.But, you know, seeing was so good during that observation, I actually did try to see the companion's rings inside (as shown.) I failed, not even sure the laws of diffraction will permit it. The companion's ring just seemed to hover outside the primary's ring.
Losmandy G8, Alt-Az AZ5 and Voyager, Telementor, AS80/1200, AS110/1650, Atik314L Pan 27-19; Delos 10; BGO 18-12.5-9; Pentax XF12-8.5 XO5.1-2.5; Siebert 36, TV Plossl 55; TMB SMC 16-7; Zeiss H-40-25-16, O-40-25-16-12.5-10-6-4; ATC 40K-20K-15E-8E; ATC Barlows 2x and 1.5x My astro page
Quote: For giggled I out in 450x via the 4mm Abbe