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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Gassendi - 13.1.2022 at 22.45 - 13.1.2022 at 22.55 Vantaa, Pähkinärinne Observation number 103758

Visibility V / V

Paula Wirtanen, Ursa (Helsinki)

The day was beautifully clear and the rising Moon around 3 pm clearly saw the so-called Moon skewed phenomenon. The weather was warm too, where on Monday night it got freezing in the frost of over 15 degrees, now the temperature was on the plus side of a few degrees.

As the evening progressed, the weather was quite a roller coaster: clear, cloudy, clear, cloudy ... with the cloud ferries moving at a fair pace. The evening at half past eleven then seemed more or less clear, so the telescope into the backyard and the moon to explore.

The terminator ran well next to Mare Humorum and the crater Gassendi was at its best even when the seeing was quite good. The edge ramparts of M. Humorum running from the edge of Gassend were still visible from the terminator side and a few individual peaks of the rampart rather dimly.

Gassendi is known for his slats at the bottom, from which I can only see a glimpse. Gassendi A and B were beautifully next to it, with Gassendi B appearing donut-like with only the ramparts lit up.

The intention was to examine the crater more closely and switch to a higher magnification. And then: clouds began to gather in the sky again. The promising observation trip ended quite quickly and it only took ten minutes to make a proper observation. As I waited my time, the cloud cover began to thicken and it was time to return home to finish the little semi-finished work. Goodbye, Moon, again for now. Luckily, I got a little time to watch the beautiful terminator until we meet again.

In the drawing, the air directions as they look when viewed through an angular prism (mirror image, i.e. north at the top, east at left).

The Gassendi Crater is named after Pierre Gassendi, a French mathematician, astronomer and Catholic philosopher who lived in the early 17th century. He discovered the overrun of Mercury predicted by Kepler in 1631.

#Lunar100: 013

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

Sky-Watcher Skymax-127 (M127 / 1500), SP 10 mm (150x).

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