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Ursa Astronomical Association
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Ursa Astronomical Association

Atlas - 24.10.2021 at 00.35 - 24.10.2021 at 01.22 Harjavalta Observation number 101946

Visibility IV / V

Jari Kuula, Porin Karhunvartijat

The attempt to draw Atlas and Hercules in the evening light, perhaps too early in the evening, the shadows were short. The weather was good, and the Moon was high, so the rills of Atlas stood out every now and then. The Atlas is an early-crimean crater, with a thick throwing mantle (Glacis) around it, except in the northwest, where Glacis sinks in the direction of Atlas E. Teemu Öhman recalled that TG Elger (1838-1897) launched the word Glacis defining: outer slope of a ring-plain. Hercules is eratosthenes, about 68 km in diameter. In the sonar images, Hercules E stands out as oval because it has hit exactly on the edge wall.

Additional information
  • Observation target
    • Moon surface feature
  • Name of the observation target
    • Atlas
  • Seeing
    • Good
Technical information

Maksutov 170 (Catadioptric telescope made by Seppo Sali, completed in 1976, presented T + A 3/80)

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