We would like to Thank the Following Guest Speakers.
Master Optician, Director of optical quality for the ISS-Amateur Telescope Project,
Here are a few highlights of telescopes whose optics were made by Dan Joyce or one of his students:
The Peoria Astronomical Society's 24" Telescope,
Dan Troini's 10",
October 24, 1979, first sighting of the first major disturbance in Jupiter's South Tropical Zone since 1944. A few weeks earlier Voyager II passed the planet without noticing it.
December 14, 1979, recovery of "Rima Tenuis" (soft rift) feature in Martian North Polar Cap, seen in1888, 1901, 1903 and 1918 but not since. Viking II orbiter was primed to find it one Martian year earlier but failed to find it. Confirmation took place two months later with Lowell Observatory 24"
July 18, 1994, sighting of Comet Shoemaker-Levy/9 "D" impactor into Jupiter that eluded HST and everyone else. This observation was with an 8" Newtonian - the other two were with his famous 10"Newtonian (both f/6).
Don Parker's 16" f/6
July, 1990, confirmation of a feature known as the bi-colored aspect of Saturn's rings on video.
February, 1993 revelation of known albedo features under the Martian North Polar Hood which verified a hypothesis put forth by Pluto discoverer Clyde Tombaugh in 1952 that the polar capis a result of the snowing out of the hood feature.
July 16, 1994, first ground-based images of Shoemaker-Levy/9 impact into Jupiter, done with sun still three hours from setting.
December 8, 1995, exact time and exact spot of the Galileo atmospheric probe drop into Jupiter's cloud decks, revealing an anomalistic dark region in an otherwise white zonal band, explaining the reason for unexpected chemical composition, especially lack of water. This was done with the planet just eight degrees from the sun which itself was three degrees above the horizon. Rules prohibit HST from aiming within 60 degrees of the sun.
Bill Benesch's Daily Solar Telescope
Photograph of sun in white light in August, 1989 showing the greatest number of sunspots on a single image, well over 300. This telescope, a 5.5 " f/13 Daly Solarscope, was listed in the "Ten Best Ideas" for telescopes in Sky & Telescope for 1989.
Jeff Biesh's 16",
July 16, 1994, Jeff Beish of South Florida has first ground-based view of S-L/9 impact on Jupiter more than three hours before sundown.
Chuck Cambell's 16" that was used to locate a Super Nova in M51 in April of '94,
Rebecca Saflarski's 10" f/4.8 Telescope, the sister Telescope to
George Lucas's R2D2 a 10" f/4.8 Telescope at Skywalker Ranch.
April 1, 1994 Tim Puckett and Jerry Armstrong use 16" f/6.2 to be first to image the "April Fool" supernova in M51.
Been Tom Skilling's Astro go-to guy since 1983 and for many years the "Planet Watch" columnist for the Chicago Tribune.
Been educator at the Cernan Earth & Space Center since September, 1986, often seeing 25,000 students per year from school field trips.
On the board of directors of CAS every year but one since 1973 and have been Pres. and v-p five times and Secretary six times.
Illinois Chapter President of City Lights Astronomical Society for Students.
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Presenter for The Night Sky Network