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Ursa Astronomical Association
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Ursa Astronomical Association

Rimae Hippalus - 30.4.2023 at 20.30 Ulvila Observation number 115759

Visibility III / V

Vesa Puistovaara, Porin Karhunvartijat

The early evening of May Day offered nice clear and sunny weather and the Moon was comfortably high in the southern sky...At first the seeing was quite bad, but it improved clearly within an hour.

I tried to photograph the rillet of the crater Hippalus, and I am quite satisfied with the end result. I put the names of a few bigger craters in the second picture. The letter A is therefore Agatharchides A, diameter 16km, on the right side of which ("riding the rim", if the term is allowed in this context) Rima Hippalus IV can also be seen: in the picture, a vertical darker shore. Inside the circled area you can see the design of the Hippalus-lambda massif and rima III.

I also tried what a negative image would look like (3rd image). I will now add accordingly.

Additional information
  • Observation target
    • Moon surface feature
  • Name of the observation target
    • Rimae Hippalus
  • Seeing
    • Average
Technical information

Telescope: C11 + 2x Barlow

Camera: ASI120-MM

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