Domes of Arago

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astroavani Brazil
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Domes of Arago

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Post by astroavani »


Domes of Arago
This is the best week for lunar observation, the shadows are long and the formations stand out easily. In this particular photo we can see the domes near Arago.
There are a pair of very large domes, one to the north (Arago Alpha) and one to the west (Arago Beta). These are two of the largest and most prominent domes of the Moon and, halfway between Arago a and the Maclear crater (160 kilometers to the northeast), you will find a challenging group of four smaller domes. It will be a good victory for you, if you can identify them.
The domes or domes, are low and rounded structures, found in areas of mares where formerly the growing magma pushed upwards and caused the lunar surface to jump in bubble-like bumps. Sometimes, the underlying pressure was not enough to cause the magma to break; others, the domes erupted in small, slightly inclined shield volcanoes, and their holes in the summit can actually be seen under low angle lighting as seen here: https://www.astrobin.com/200363/?nc=user
The lunar domes do not attract attention, like the most spectacular craters and mountains, so they are easily ignored, but they are fascinating objects and are worth the effort to look for. As the endogenous theory of crater formation has been widely contested, it is fun to hunt for evidence that there was indeed volcanic activity on the Moon. You will need at least 15 cm of aperture and 150 to 300X power to view most of the domes.
As the lunar progresses, pay attention to the region near the terminator, it is a good challenge to try to identify these formations in addition to being a testament to the good optical quality of your equipment.
Source: Andrew Planck
Adaptation: Avani Soares
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Lady Fraktor Slovakia
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Re: Domes of Arago

#2

Post by Lady Fraktor »


Another wonderful image Avani, thank you for posting it :)
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Michael131313 Mexico
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Re: Domes of Arago

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Post by Michael131313 »


Thanks for the information and the great image.
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Re: Domes of Arago

#4

Post by j.gardavsky »


Excellent capture of the domes, and not only of the domes!

Thank you for sharing,
JG
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Re: Domes of Arago

#5

Post by Hankmeister3 »


Another wonderful "from orbit" view of Lady Luna. Thank you for sharing, Avani!
Telescopes: Meade LX90 10-inch f/10 UHC Coma-free SCT; Explore Scientific 127mm f/7.5 APO ED triplet refractor; Explore Scientific 102mm f/7 APO ED triplet refractor; Explore Scientific 80mm f/6 APO ED triplet refractor; Skywatcher 72mm f/6 ED Schott doublet refractor; Meade 70mm f/5 APO quadruplet astrograph refractor; Skywatcher Quattro 8-inch f/4 Newtonian astrograph; Orion 6-inch f/4 Newtonian astrograph; Skywatcher SkyMax 180mm f/15 Maksutov; iOptron 150mm f/12 Maksutov; Orion f/9 Ritchey-Chretien RC astrograph
Eyepieces: Set of 7 Baader Hyperion eyepieces, 3 Meade 5000 glass handgrenades; 1970s era Japanese manufactured Meade 12.5mm Orthoscopic, and too many other eclectic eyepieces to list
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