CHAMÄLEON + ONJALA OBSERVATORY – LUNAR ATLAS Segment 06 back to OVERVIEW HOME CHAMÄLEON

Floor fractured crater Atlas Moon age 5.1 days - Illumination 21 % Moon age 5.5 days - Illumination 25 % Moon age 6.1 days - Illumination 30 % Moon age 6.8 days - Illumination 35 % Moon age 7.1 days - Illumination 39 % Moon age 7.8 days - Illumination 49 % Moon age 7.1 days - Illumination 39 % Dome Aristoteles Dome Bürg Moon age 8.4 to 10.5 days - Illumination 53 - 75 % Dome Meton Dome Archytas NEW 2016 Dome Archytas

Atlas- a floor fractured crater - Moon age 5.1 days Atlas (87 km) is a typical example of a floor fractured crater. It is located at the eastern end of Mare Frigoris. On the crater floor is a complex system of rilles, associated with smaller areas of pyroclastic deposits. These ash deposits are clearly visible under a full moon illumination. LRO image with a resolution of 125 m/px The following images show Atlas with increasing illumination up to a moon age of 7.1 days.

Atlas - Moon age 5.5 days Compared to the image above (moon age 5.1 days) the effect of the libration can be seen when looking at the crater Endymion. Also note the change of the shadow in the crater Atlas. In the upper image the small crater on the floor of Atlas lies in the shadow. Now, it is clearly located in the sunlight.

Atlas - Moon age 6.1 days Lacus Mortis with its main crater Bürg (40 km) becomes visible from a Moon age of about 6 days and older.

Atlas - Moon age 6.8 days This image dates from 2007 and also shows the northerly Mare Humboldtanium under favorable libration.

Atlas - Moon age 7.1 days Lacus Mortis is now visible with all its rilles and fractures under best illumination. The lower right part of the image is also interesting. Various thin lava layers of Mare Frigoris can be observed there, result of fast lava flows with very low viscosity.

NEW 2016 Atlas - Moon age 7.8 days Atlas at a Moon age of 7.8 days. One of the large ash deposit is visible zurück zum Seitenanfang

Moon age 7.1 days - Illumination 39%

Aristoteles Ar 1 - a small effusive dome west of Aristoteles At a lunar age of 7 days, the terminator is located between the large crater pair Aristoteles (87 km) / Eudoxus (67 km) and the completely flooded crater Egede (37 km). The small effusive lava dome Aristoteles 1 becomes visible for a short time. The diameter of this class B2 dome is about 6 km with a height of 80 meters. In this image the Frigoris lava layers are also visible. top of the page

Lacus Mortis - Bürg When looking through the LRO images we found an image showing the southwestern end of the Bürg rille and two "small volcanoes". They have a diameter from 1 to 1.5 kilometers. The heights are about 100 meters. Due to the strong perspective distortion they are hardly visible in our image.

In our image, the various lava flows in Mare Frigoris are also visible. With this Illumination you can also see that the mountainside Rupes Bürg in the northern area continues to a rille. This effect can also be observed on other of these structures like Rupes Cauchy.

Moon age 8.4 to 10.5 days - Illumination 53 to 75 %

Meton Me 1 and Archytas Ar 1 + Ar 2 - Moon age 8.5 days (54%) Me 1 with a diameter of 14.5 km requires an optimal libration due to its extreme location close to the lunar edge. Its type is B" like Aristoteles 1 and reaches a height of 90 meters. On top of the image the two domes Archytas 1 and 2 are visible.

Archytas Ar 1 + Ar 2 - Moon age 8.5 days (54 %) Archytas 1 in the southern Mare Frigoris is a class B1 dome with a diameter of 11 kilometers with a height of 260 meters. Archytas 2 is classified as an large intrusive dome of class IN 1. It has a diameter of 33 kilometers with a height of only 70 meters. One of the few concentric double craters (Archytas G , 7.2 km) associated with a dome is located on top of the it. Due to its position near the lunar edge a favourable libration is nessessary for optimal imaging. Unfortunately our image shows the double crater not optimal. The Vallis Alpes with its narrow rille inside can be optimal observed at this lunar age. The width of this rille is between 550 and 1.000 meters.

The Vallis Alpes with its rille in a Lunar Orbiter IV image with marked widths and depths of the rille.

Archytas Ar 1 + Ar 2 - Moon age 8.5 days (54 %) The left image shows Archytas Ar 1 and Ar 2 at an illumination of 54 %. Only 24 hours later (illumination 65 %) the very low dome Archytas 2 is practically unvisible. At a lunar age of 10.5 days ( 74 %) only the craters on Archytas 2 are visible and the domes itself are no longer visible. Here the two other images of this region..

NEW 2016 Archytas Ar 1 + Ar 2 - Moon age 8.8 days (59 %) Archytas 1 and 2 are still clearly visible at a moon age of 8.8 days. The eastern crater wall casts spectacular shadows at sunrise. Archytas 1 + 2 - Moon age 9.6 days (65 %) Archytas 1 + 2 - Moon age 10.6 days (74 %)

NEW 2016 LRO Archytas Ar 1 + Ar 2 LRO image of Archytas 1 and 2 with an image resolution of 250 m/px in equidistant cylindrical projection. top of page

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All Images - otherwise marked - and all Content are © by Franz Hofmann + Wolfgang Paech