... Each detector array comprises 256 x 256 square pixels and is divided into 4 quadrants of 128 x 128 pixels, each of which is read out independently. ... Typically, the read-noise is ~30e - /pixel, and the dark current << 0.1e - /sec/pixel. ... Read Noise (e - ) 1 . ... 162,000 . 161,000 . ... 50% DQE Cutoff Wavelength (microns) . ... The fine details in these DQE curves should not be interpreted as detector features, as they may be artifacts introduced by the test set-up used to measure them. ...

MESSIER 5 AND ITS VARIABLES `A noble mass, refreshing to the senses after searching for faint objects' Admiral Smyth The oldest known stars have survived chiefly in the rich and wonderfully symmetric formations called globular star clusters. ... 2] Charles Messier revealed the globular cluster on May 23, 1764. ... The globular cluster itself is magnificient and granular at 60x. Individual small stars are scattered around the edges, and one or two of them can exceed the others in brightness. ...

... To construct a scale model of Saturn and its rings . ... Students will construct a scale model of Saturn; use it to explain a Voyager image of Saturn's shadow on its rings; and, by trial and error, discover that light moves through space in straight lines. ... If the students correctly identify the ring's shadow on the planet and the planet's shadow on the rings, label these as well. ... ii) As they raise or lower the flashlight relative to the grapefruit, the shadow of Saturn on its rings changes. ...

Educator's Guide to Impact Craters . ... Just about all craters have deep central depressions, raised rims, and a blanket of ejected material surrounding them. ... Look for classical cratering features: basin, raised rim, ejecta blanket (material excavated from the crater and dumped around it, visible as white flour on the colored powder), and rays (material shot out at high velocity forming lines pointing directly away from the impact site). ... The material lies like a blanket around the crater. ...

Two projects are depicted here: painting the secondary supports and installing the rollers under the telescope. Caption precedes pictures . Angie Prosapio, with the help of Bill Boroski, Terry Sager, Chuck Wilson, and Steve Bastian, installed the rollers under the telescope. ... Another successful installation! Steve from CVE struggles with the breeze (and a day of rain) to paint the support structure in time for reassembly. ...

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