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Monthly Archive for: ‘July, 2011’

Arzachel is a relatively young lunar impact crater located in the highlands in the south-central part of the visible Moon, close to the zero meridian (the visible center of the Moon). It lies to the south of the crater Alphonsus, and together with Ptolemaeus further north the three form a prominent line of craters to …

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Due to the location of the crater toward the southern limb, the crater appears oblong due to foreshortening. Because of its great size, Clavius can be detected with the unaided eye. It appears as a prominent notch in the terminator about 1-2 days after the Moon reaches first quarter. The crater is one of the …

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G. J. Garradd (Siding Spring Observatory, Australia) discovered this comet on four images obtained between 2009 August 13.77 and August 13.81. He was using the 0.5-m Uppsala Schmidt telescope and a CCD camera. The magnitude was given as 17.5-17.7 and the coma was described as circular and 15″ across. The first confirmation was obtained by …

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G. J. Garradd (Siding Spring Observatory, Australia) discovered this comet on four images obtained between 2009 August 13.77 and August 13.81. He was using the 0.5-m Uppsala Schmidt telescope and a CCD camera. The magnitude was given as 17.5-17.7 and the coma was described as circular and 15″ across. The first confirmation was obtained by …

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