Celestron C9.25-S CG-5 mount Explore Scientific ED80 CG-4 Complete set of ES 82's Canon T1i LS60THa
Orion xx14g Dob CPC 1100 w/Skywatcher 80ED piggybacked Coronado PST TMB 92L refractor AT Voyager mount Nexstar 6/8 mount Denk Big Easy binoviewers Oodles of eyepieces and other optical gadgets Past scopes Meade 8" reflector and 8" SCT
Ken Fiscus- stargazing since 1980. Now observing from a green zone.
Z12 on custom mount, Atomic EQ platform, 100% flocked, OMI primary, Astrocrumb filter slide with O-III, NPB, & skyglow filters. Focuser & spider rotated 45 degrees. New springs & Bob's Knobs, Telrad & 9x50 straight finder 35 & 24 Pans, TV 13,7,5 T6s
Custom Orion XT10 with piggyback XT4.5 on Round Table EQ Platform
Quote:Does anyone know how they can tell that Comet ISON is indead a comet? Wouldn't an asteroid/dwarf planetoid appear the same in photos at that great a distance?
First and foremost observing love: naked eye.
Last but not least, telescopes.
And I sometimes dabble with cameras.
Dr. Willie K. Yee President Mid-Hudson Astronomical Assn.Member RAC, AOSNY, IDA, Astronomers Without Borders, Charlie Bates Solar Astronomy Project
NexStar 50 Expert, Lunar 50 Expert; AL Outreach, Messier, and Sunspotters AwardsCommander Prius Class Shuttlecraft Zhang HengTeeter 13.1" f/4.5 Custom Dob, NexStar8 SE, Meade 80mm f/6 ED Apo, Meade 363 f/10 80 mm, Lunt LS60THa, PST dbl stk
Quote:I think comets like this one give away their identity by being much more reflective than the alternatives at the same distances. ISON looks to be a REALLY good comet because it's been found while still very far out.
Quote:I suspect it is based on orbital paths. Comets orbit in a highly elliptcal path (and in fact ISON may be a one-time commet that will be flung completely out of the solar system after one pass) while asteroid orbits are generally much less eliptical like a planet's. Once a new object is detected they can do a rough orbital calculation after only a few days' observations.