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Ursa Astronomical Association

Ptolemaeus, Alphonsus, Arzachel - 9.5.2022 at 23.43 - 9.5.2022 at 23.45 Helsinki Observation number 106765

Visibility III / V

Jerry Jantunen, Ursa (Helsinki)

Ptolemaeus photographed just over a day after my previous attempt. Visually, looking at the Moon at Merz, the weather seemed so more worthy that I got excited to bite the tower with a more powerful but whimsical C11 tube.

The craters that remained under the floor of Ptolemaeus were no longer distinguished, except for Ptolemaeus B, which is to the north of the younger crater of Ammonius. The smaller, fresher craters at the base of Ptolemaicus stood out well in this illumination.

At the bottom of the Alphonsus are a series of slats and apparently volcanic tiny craters along them that have scattered dark matter around them. Alphonsus also specializes in a shallow ridge that runs through the crater.

South of Alphonsus are two craters with steep central peaks, Alpetragius and Arzachel. There are rills on the bottom of the Arzachel.

To the west of Ptolemaeus is a clever chain of small craters, Catena Davy. Charles Wood, the father of the Lunar 100 list, considers it the result of a collision of a comet that shattered into pieces, which seems like a fairly natural explanation, especially since there are also craters in the chain in the edge mountains of Davy Crater.

Image in larger size

#Lunar100: 047
#Lunar100: 051
#Lunar100: 075

Additional information
  • Observation target
    • Moon surface feature
  • Name of the observation target
    • Ptolemaeus, Alphonsus, Arzachel
  • Seeing
    • Average
Technical information

279/2800 mm Schmidt-Cassegrain (C11), 3x Barlow, ADC, IR removal filter, ASI482MC

Comments: 3 pcs
Paula Wirtanen - 14.5.2022 at 23.42 Report this

Mahtavan hyvä kuva, itse olin samana iltana tutkimassa samoja alueita kotipihalla, tosin huonommissa olosuhteissa. Mm. Ptolemaeus B ei erottunut lainkaan.

Gyldénin laakso (L92) näkyy muuten aivan kuvan yläreunassa myös varsin mainiosti. 

Jerry Jantunen - 15.5.2022 at 13.44 Report this

Kiitoksia kommentista. Gyldénin laakso tosiaan näkyy osittain. Vähän huolellisemmalla suuntauksella sen olisi voinut saada kokonaankin kuvaan.

Paula Wirtanen - 15.5.2022 at 21.51 Report this

Hyvä muutenkin saada omien visuaalihavaintojensa tueksi näitä samoihin aikoihin saatuja valokuvia. 

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