As many of you know, Lowell Observatory is planning on building a 4-meter telescope. The site for the telescope is not absolutely decided, but is very likely to be a cinder cone just west of the settlement of Happy Jack in central Arizona. Elevation is about 7700 feet. Attilla Danko has kindly added a new 'ClearSkyClock' for the location: http://cleardarksky.com/c/DCTOb1AZkey.html?1 My purpose in mentioning this is that visual and imaging observers may be interested in using the site before construction begins in earnest, probably this time next year. The summit is not large but should accomodate a few groups/vehicles. At present there is a small fenced compound holding Lowell site-testing apparatus, with a weather-instrument mast, small trailer, etc. The advantage of the site, compared to essentially all that are used by folks on this list is plainly evident by the following: http://www.lowell.edu/Research/NGLTbak/hj.2003.jpg This shows a histogram of seeing measurements taken in 2003, summarizing 387 hours of data on 99 nights. The median seeing is 0".84 full-width- half-maximum, and the mode (most common) value is 0".75. The first quartile seeing is 0".61. This last figure means that a quarter of the time the seeing is 0".6 _or_less_. (The plot dies out below 0".5 because the two-hole differential image-motion rig is on a C14, which limits resolution to about that of a 10-inch telescope. The rig has been used at the WIYN telescope on Kitt Peak, from which we know that the results are reliable in comparison to the monitoring done with that telescope.) In brief, this is a good seeing as you'll find at a world-class observatory site. Later this spring and again all through the post-monsoon months should be the times to check out this site. \Brian -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.