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Ursa Astronomical Association

Moon surface feature - 11.3.2022 at 22.45 Kauhava Observation number 105326

Visibility III / V

Jari Kankaanpää, Lakeuden Ursa

Rima Hyginus

This 220km long Rilli is located on the southern edge of Mare Vaporum. In the middle of the ridge is the Caldera - about 9km in diameter. Probably a volcanic formation, as it does not show edging ramparts that would rise above the surrounding plateau. A chain of at least 12 craters is visible in the gorge branching from the caldera to the northwest (upper left). The chain is probably the result of a collapsed lava tunnel, or they are smaller discharge openings.

Additional information
  • Observation target
    • Moon surface feature
  • Seeing
    • Average
Technical information

Meade 12SCT, 2.5 x Tele Vue Barlow, High pass filter & Case 174mm camera.

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