Astronomy educator/Sidewalk astronomer
Owner of Astronomy Delight franchise
18 inch f4.42 Dob on eq platform w ST120 f/5 finder
12 inch Zhumell Dob
8 inch f/6.9 home made Dob with Seevers optics
William Optics red 10th Anniversary 80mm FD
C8 XLT on Vixen GPDX
26lb eyepiece box
Cernan Space Center astronomer
Member of Northwest Suburban Astronomers
22" and 14" Dobs on EQ platforms and Deep Sky Observing
150mm MCT f/13, 31% CO
"People say I'm in denial. I disagree."
Quote: I would think that the C9 would be at the very limit or incapable of distinguishing Vesta from a star.
Cactus Patch Observatory / 14" LX200
"The four points of the compass be logic, knowledge, wisdom, and the unknown. Some do bow in that final direction. Others advance upon it. To bow before the one is to lose sight of the three."
Michael Rosolina Celestron CGE Pro 1400 f/11 SCT 1980 Orange Tube C8 f/10 SCT 108mm f/4.2 Astroscan Reflector 50mm f/10 Galileoscope 40mm PST f/10 APM Germany HD 15x70 binoculars Canon 12x36 IS II binoculars Mark I Eyeball My CN Gallery
Quote: First we have several reports of detail being seen on Ganymede; then cloud bands observed on Uranus; and now, Ceres resolved as a disk. There's a fearless new breed of amateur planetary observer that is really pushing the boundaries.
"You're not afraid of the dark, are you?" - Riddick "The best scientists are humble. They seek to understand, not to ensure their legacy, but merely to understand." - Mori
"...life is but a dream." Trying to update my tutorials Be sure to add me on Google Plus (TONS of good Science and Astro people here!) Mike's homepage My Scope, Akule - the Custom 14" f/4.5 Newt
Quote:Also I recall the color of Ceres was unlike a star, being somewhat like a miniature Mars. Later I ran across a reference, now misplaced, that reported a B-V magnitude measure which contradicted the color I saw.
Quote: Actually, anything about 1/4th the Airy disc diameter will begin to produce a PSF larger than a point source.