Lunar field and highland domes Gruithuisen
Taken by Raffaello Lena on December 30, 2025 @
Rome Italy
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On December 30 2025 I have imaged at the terminator this lunar region including Mairan and from Delisle to Prinz (emerging from terminator). Furthermore Highland domes are imaged.The height of Gruithuisen γ is of 1740 m, the diameter amounts to 19 km, resulting in an average slope of 8.3°. The height of Gruithuisen δ and the Northwest Dome amounts to 1960 m and 1117 m respectively, with diameters of 27 km and 7.5 km, resulting in average slopes of 6.9° and 9.1°. Many wrinkle ridges are present in this wide lava field.due to their steep flank slopes, high volumes, and red spectral signatures, giving rise to the assumption that they have been formed by lava of significantly different composition than basaltic domes. As note of interest in scientific field, Diviner dataset produces thermal emissivity data, and can provide compositional information from three wavelengths centered around 8 µm which can be used to characterize the Christiansen Feature (CF), which is directly sensitive to silicate mineralogy and the bulk SiO2 content. CF value indicates a high Si content of the material that makes up the Gruithuisen domes, thus supporting their formation by highly viscous lavas. The average calculated CF position for these highland domes is 7.87 µm indicating high plagioclase feldspar composition.
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