Venus and Mercury, and How to Observe Them (Astronomers' Observing Guides)
Peter Grego
Language: English
Pages: 266
ISBN: 0387742859
Format: PDF / Kindle (mobi) / ePub
Venus and Mercury have long been regarded as difficult targets for amateur observers, but advances in commercially-made telescopes have brought them within the skills of observers of only moderate experience. Peter Grego’s fascinating book presents an up-to-date, detailed description of the history and geology of the so-called inferior planets, and provides the latest, most useful advice on observing and recording them with commercially-available telescopes and cameras. The book also offers a wealth of detailed practical information on every aspect of observing, from safely targeting the two planets, through visual observing, to sketching and electronic imaging.
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Immediate south of Lu Hsun (0N, 23W/98 km), a crater with rounded walls and a striking valley cutting through its northeastern wall and floor. The young plain south of Lu Hsun fills an unnamed crater some 300 km in diameter; to its southeast lies Brunelleschi (9S, 22W, 134 km), a relatively well-preserved crater with wide, internally terraced walls and a broad outer apron to its west. Upon its smooth and flooded floor lie several ridges and a number of small impact craters, along with numerous.
Scarp. Several larger, unnamed craters lie to the west; one noteworthy example is a particularly complex ancient crater that lies around 100 km to the northwest of Van Dijck at around 78N, 192W. Near Mercury’s north pole, Purcell (upper right) to Nizami (lower right). NASA. 42 Our Current Knowledge of Mercury Across the hilly terrain to the south of Purcell can be found a neat group of half a dozen medium-sized craters which includes the well-preserved Jókai (72N, 135W/106 km), the youngest.
Terrain south of Caloris is the crater Mozart (8N, 191W/270 km), a large and imposing crater surrounded by an apron of radial impact sculpting and several coarse concentric ridges. A number of chains of secondary impact craters project in radial fingers away from Mozart, two particularly prominent ones lying to the southeast of the crater, running roughly parallel to one another across the western plains of Tir Planitia for around 250 km. Tir Planitia itself is a broad, lava-flooded impact basin.
Ishtar Terra. Ishtar Terra, a vast continental highland region, sprawls across the northern part of the region for 5,610 km between longitudes 300 and 80E. It has an area of around 8 million square kilometres, equivalent to the area of Australia; unlike 109 Our Current Knowledge of Venus Chart showing the main regions in Region One, from 300 to 60° east longitude. Australia, however, Ishtar Terra is topographically very varied, comprising three distinct sections. Its western component is the.
Planitiae also vie for position in the south, and in general these are smoother and less wrinkly than their northern counterparts. Several major chasmata wind their way across the southern sub-equatorial region, including Juno Chasma (31S, 111E/915 km), Quilla Chasma (24S, 127E/973 km), Diana Chasma (15S, 155E/938 km) and the magnificent Artemis Chasma (41S, 139E/3,087 km) which curves around the eastern edge of the vast Artemis Corona (35S, 135E/2,600 km). The lowlands of Louhi Planitia (81N,.