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CHAMÄLEON + ONJALA OBSERVATORY – LUNAR
ATLAS Segment 09 B |
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Segment 9
A Pyroclastic deposits and FF - crater Alphonsus, Gambart Region, the lunare cone Lassell D and putative plateaus Guericke/Opelt Segment 9 B Pyroclastic deposits in the craters Deslandres, Walter and Hell, FF - crater Pitatus and the "bisected" Birt domes Segment 9 C Capuanus, the concentric double crater Marth, Kies domes and the intrusive dome "The Helmet" (Plateau Agatharchides) Segment 9 D Landsberg region, Montes Riphaeus, kipuka Darney Chi, putative domecluster Euklides |
| Moon age 8.5 - 8.8 days - Illumination 55 - 58 %
Bisected Birt domes NEU 2016 Bisected Birt Dome |
Moon age 9.6 days -
Illumination 65 % FF-crater Pitatus Bisected Birt domes |
Moon age 10.6 - 11.6 days -
Illumination 65 -75 % Pyroclastic deposit in Deslandres, Walter and Hell FF-crater Pitatus |
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Birt domes -
Moon age 8.5 days (55
%) Both effusive Birt domes are located at the northern end of Rima Birt and devides by it (bisected). Rima Birt is slightly curved and has a length of about 50 kilometers. The rille shows several lateral offsets, one of it isdirectly next to the dome Birt 1. Birt 1 has a diameter of 16 kilometers and a height of 170 meters. Birt 2 is with a diameter of 8 kilometers significantly smaller and with a height of 70 meters also much lower as Birt 1. Because of their low height, both domes require an extremely low elevation of the sun to be visible. |
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Birt domes -
Moon age 8.5 days (55
%) Birt 1 and Birt 2 (on top of the image) under similar illumination conditions but more three-dimensional. The surrounding of Birt 1 seems to be covered by a pyroclastic ash deposit. Both Birt domes can be compared to the bisected Menelaus domes. |
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NEW 2016
Bisected Birt
Domes - Moon age
8.8 days (59 %) At a lunar age of just 9 days the mountainside Rupes Recta becomes clearly visible. Almost parallel to it Rima Birt with the two domes can be found. The whole region seems to be located in a very large and very old circular crater, of which only the eastern crater rim is present in a rudimentary form. From the western side, the crater was flooded by the lava of Mare Nubium - some ridges might be the remnants of the former crater wall . Rupes Recta and Rima Birt both face radially towards the center of Mare Imbrium. Birt 1 has a diameter 16 kilometers and a height of 170 meters. Birt 2 is with 8 kilometers significantly smaller and with a height of 70 meters also much flatter. Both domes require extremely flat illumination because of their low height. A moon age of just 9 days is optimal. |
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Birt domes -
Moon age 9.6 days (65
%) Rupes Recta, Rima Birt and the two Birt domes at a moon age of 9.6 days. Rupes Recta is actually not so a steep slope as it appears here in the images. The height difference is about 400 meters, but extends over a width of 2 kilometers(see a LRO height profile). |
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Pitatus -
Moon age 9.6 days (65
%) Pitatus (97 km ) is a typical tilted floor fractured crater located on the southern edge of Mare Nubium. Directly to west there is the crater Hesiodus which is connected by a gap in the crater wall of Pitatus. And directly above there isHesiodus A (15 km) - one of the few double crater on the near side of the moon. On the right side a part of the wide Rima Hesiodus becomes visible. LRO image of Pitatus eith a resolution of 125 m/px. |
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Pyroclastic deposits in
the craters Deslandres, Walter and Hell -
Moon age 10.6 days (75
%) In the highland areas of the moon are just a few structures of lunar volcanism. One of it are the dark areas in the craters Deslandres (228 km) and Walter (137 km) and Hell (32 km). They could be pyroclastic ash deposits or dark mantle deposits, but their origin is unclear. Even the high-resolution LRO images show no evidence of a systems of rilles or faults. |
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Like many of this dark areas they become clearly visible under full moon conditions. The image to the left was captured on 28.09.2015, before the total lunar eclipse. It was taken wit a 6" Zeiss APQ refraktor and a 2x barlow lens. |
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Pitatus -
Moon age 11.6 days (83
%) The FF-crater Pitatus at a moon age of 11.6 days. To the west there is the double crater Hesiodus A (15 km) in full sunlight. |
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