Nice report, Don! -- Joe --- On Thu, 7/30/09, Don J. Colton <djcolton@piol.com> wrote: From: Don J. Colton <djcolton@piol.com> Subject: Re: [Utah-astronomy] Jupiter Impact Scar To: "'Utah Astronomy'" <utah-astronomy@mailman.xmission.com> Date: Thursday, July 30, 2009, 10:46 AM I started observing Jupiter's impact scar about 3:45 AM and ended at 4:10 AM (July 30, MDT). I was using an 8" Celestron Ultima SCT at 160x and 236X. At first the scar was faint and barely visible at 160X. Seeing improved markedly after a few minutes and the scar was easily visible. I watched it transit approximately as scheduled (I didn't try to time it). I was surprised how visible it was compared to the last time, but then I was using a smaller scope under poorer seeing. I assume it is now harder to see, all things being equal, than it was on July 23. I noticed a fairly significant improvement in detail when I switched from a 1.25" - 13 mm Meade Super Wide to a 1.25" - 13mm Nagler Type 6. Even though the Nagler had more glass the image was clearly sharper and the scar more readily observed. The Nagler was probably superior due to better optics and coatings. Previously I had not considered Naglers' to be planetary eyepieces. _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com