By Stephen James O'Meara
The Herschel four hundred is a listing of four hundred galaxies, nebulae, and famous person clusters, picked from over 2,500 deep-sky gadgets found and catalogued via the nice eighteenth-century astronomer Sir William Herschel and his sister Caroline. It contains 231 galaxies, 107 open clusters, 33 globular clusters, 20 planetary nebulae, 2 halves of a unmarried planetary nebula, and seven vivid nebulae. during this consultant Steve O'Meara takes the observer throughout the record, season by way of season, month by means of month, evening via evening, item by means of item. He works in the course of the items in a gently deliberate and methodical means, taking in one of the most dramatic non-Messier galaxies, nebulae, and big name clusters within the evening sky. perfect for astronomers who've tackled the Messier items, this richly illustrated advisor might help the novice astronomer hone their staring at abilities.
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The Herschel four hundred is an inventory of four hundred galaxies, nebulae, and celebrity clusters, picked from over 2,500 deep-sky gadgets came across and catalogued by means of the good eighteenth-century astronomer Sir William Herschel and his sister Caroline. It contains 231 galaxies, 107 open clusters, 33 globular clusters, 20 planetary nebulae, 2 halves of a unmarried planetary nebula, and seven vibrant nebulae.
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Extra info for Herschel 400 Observing Guide
5 bar. Cassini has revealed on Titan a complex surface morphology that includes rivers, lakes, and possible cryo-vulcanism. The intermediate and smaller satellites of Saturn all appear to have icy compositions and have undergone substantial processing, possibly as a result of tidal heating and also due to collisions. Orbital resonances exist between several pairs of satellites, and most are in synchronous rotation with Saturn. An interesting exception is Hyperion, which is a highly nonspherical body and which appears to be in chaotic rotation.
The Uranian system consists of five intermediate-sized satellites and 22 smaller ones. Again, these are all icy bodies. These satellites also exhibit evidence of past heating and possible tectonic activity. The satellite Miranda is particularly unusual in that it exhibits a wide variety of complex CLBE001-ESS2E November 8, 2006 11:17 18 Encyclopedia of the Solar System terrains. It has been suggested that Miranda, and possibly many other icy satellites, were collisionally disrupted at some time in their history, and the debris then reaccreted in orbit to form the currently observed satellites, but preserved some of the older morphology.
The success with finding Uranus’ rings led to similar searches for a ring system around Neptune using stellar occultations. Rings were detected but were not always symmetric about the planet, suggesting gaps in the rings. Subsequent Voyager 2 imaging revealed large azimuthal concentrations of material in one of the six detected rings. All of the ring systems are within the Roche limits of their respective planets, at distances where tidal forces from the planet will disrupt any solid body, unless it is small enough and strong enough to be held together by its own material strength.
Herschel 400 Observing Guide by Stephen James O'Meara