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  • BBC Sky at Night

    MOONWATCH

    Aug 12, 2021 2 minutes

    Billy

    Type: Crater

    Size: 46km

    Longitude/Latitude: 50.2°W, 13.8°S

    Age: 3.2–3.9 billion years

    Best time to see: Four days after first quarter (18 September) or three days after last quarter (3 September)

    Minimum equipment: 50mm telescope

    Located on the southern shore of , crater may be only 46km in diameter but it has presence due to a crater of similar size but completely different appearance. Where Billy’s floor has been completely smoothed over by lava, Hansteen’s remains faithful to the original impact and appears rough, covered in a series of concentric rings infilled with hills.

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