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Solar Eclipse
[ Solar Eclipse ]

·Astronomy: Solar Eclipse - Total Eclipse-PHOTOGRAPHING A TOTAL ECLIPSE
·Astronomy: Solar Eclipse - SOLAR FLOWER
·Astronomy: Solar Eclipse - Einstein-AN ECLIPSE FOR EINSTEIN
·Astronomy: Solar Eclipse - TURNING OFF THE SUN
·Astronomy: Solar Eclipse - FOUR CONTACTS
·Astronomy: Solar Eclipse - A GREAT COINCIDENCE
·Astronomy: Solar Eclipse - RING OF SOLAR FIRE
·Astronomy: Solar Eclipse

  Saturn: Astronomy: Saturn - WORLDS OF ICE
Posted on Tuesday, December 07 @ 13:22:58 CST by astronomy


Saturn has some 18 known moons, many being mixtures of ice and rock. Most, however, lie beyond the reach of amateur-size telescopes. The largest is 8th magnitude Titan, visible even in a 3 inch (75 mm) scope. Titan circles Saturn every 16 days, and lying due east or west is about 4 1/2 ring-diameters away from the center planet. This moon is world indeed. At 3,200 miles (5,100 km) it is bigger than the Mercury. An opaque, atmosphere of nitromethane blankets its surface, which may feature lakes of hydrocarbon.

Inside Titan's orbit, other moons to look for are magnificent 9.9 Rhea, magnitude 10.6 Dione, and magnitude 10.4 Tethys. Careful observation catch the magnitude 11.9 Enceladus.

Be sure not to overloook oddball lapetus. Because its leading side is coated with dark dust, Lapetus is more than twice as bright when it lies west of Saturn than when it lies east of it-ranging from 10th down to 12 magnitude. Lapetus circles otside the orbit of Titan every 79 days at a distance of 13 ring-diameters.




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Astronomy: Saturn - LORD OF THE RINGS


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