astroavani Posted January 5, 2021 Share Posted January 5, 2021 https://www.astrobin.com/full/6hazig/0/?nc=user Ptolemaeus is a circular crater approximately 153 km in diameter, located southwest of the visible lunar face, close to the craters in the image, Ammonius (upper corner near the center of Ptolemaeus), Alphonsus (to the right of Ptolemaeus), Arzachel (to the right of Alphonsus), Alpetragius (slightly below, between Alphonsus and Arzachel), Albategnius (upper right above Ptolemaeus), Klein (below Albategnius) and Herschel (to the left of Ptolemaeus). The crater received this nomenclature in honor of the Greek-Roman astronomer from Alexandria, Claudius Ptolemaeus (90-168). Ptolemaeus is generally known to have a shallow surface. In the period of its creation (Pre-nectarian), the crater was about 5.5 km deep, but the interior of the crater was flooded by basaltic lava caused by cracks in the crust due to the strong impact that created it. This ended up leaving the inner floor of the crater with a broad and smooth appearance and approximately 2.6 km in depth. Subsequently, this region was hit by many other impacts, the Ptolemaeus border, for example, was hit vigorously by projectiles expelled during the impact that formed the Mare Imbrium basin. These subsequent impacts must have suffered a new spill of lava that ended up covering most of these faces and originated what is known as "ghost" craters. Which are visible only in very low angle sunlight, for a short period of time around sunrise and sunset. As a result, there are thousands of other "ghost" craters present on the lunar surface that have not been identified due to the difficulty in viewing, since most probes work with images when the angle of sunlight is high on the surface. There are numerous "ghost" craters present in Ptolemaeus, in which Ptolemaeus B stands out, about 14.5 km in diameter (on the upper left, next to the Ammonius crater). On December 25, Chinese researchers at Jilin University collected data from the Chang´e-1 and Chang´e-2 probes and identified about 109,000 impact craters that were not previously recognized, and the age estimate of approximately 18,000 of them, the study was published in the journal Nature Communications. The researchers created an identification platform through transparency and enabled a neural web with data from known craters. Finally, the researchers defined a new database of craters present in the regions of medium and low extension of the moon. Photo: Avani Soares Text: Liza Bruna 21 Link to comment Share on other sites More sharing options...
chiltonstar Posted January 5, 2021 Share Posted January 5, 2021 Extraordinary craterlet detail. Chris 1 Link to comment Share on other sites More sharing options...
Kon Posted January 5, 2021 Share Posted January 5, 2021 That's impressive amount of details! Well done! 1 Link to comment Share on other sites More sharing options...
vineyard Posted January 5, 2021 Share Posted January 5, 2021 That is just stunning - thank you for the explanation too! 1 Link to comment Share on other sites More sharing options...
geoflewis Posted January 6, 2021 Share Posted January 6, 2021 Stunning detail Avani. 1 Link to comment Share on other sites More sharing options...
Davey-T Posted January 6, 2021 Share Posted January 6, 2021 Excellence as per usual Avani Dave 1 Link to comment Share on other sites More sharing options...
Saganite Posted January 6, 2021 Share Posted January 6, 2021 Superb image Avani !..... 1 Link to comment Share on other sites More sharing options...
Telescope40 Posted January 6, 2021 Share Posted January 6, 2021 Holy moley !!!! Superb shot. Thanks for sharing. John 1 Link to comment Share on other sites More sharing options...
wouterdhoye Posted January 6, 2021 Share Posted January 6, 2021 an extraordinary image. Thanks for sharing! 1 Link to comment Share on other sites More sharing options...
Mr Spock Posted January 6, 2021 Share Posted January 6, 2021 Lovely image 👍 1 Link to comment Share on other sites More sharing options...
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