Contact information

Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Theophilus, Cyrillus, Catharina - 6.5.2022 at 22.20 - 6.5.2022 at 22.40 Vantaa, Pähkinärinne Observation number 106657

Visibility V / V

Paula Wirtanen, Ursa (Helsinki)

Great air, the birds were still singing and the brightest stars stood out of the sky. The moon was six months old and still clearly separated the country house with the naked eye. The trio Theophilus, Cyrillus and Catharina were in excellent lighting conditions waiting for an avid observer.

Seeing was between pretty good and mediocre, however, at 250x magnification, I was able to explore the surface of the Moon without the distracting dancing of the image.

The edge shadows were especially fine, you can see how the edges of the craters are anything but flat. The edges of the bottom shadow of the trio, Catharina, were sharp, somewhat reminiscent of cogwheels. The pimples in the shadows on the east side of the crater are Catharina B and G, who were still in the shadows. The Catharina P and S at the bottom also stood out clearly.

Cyrillus A was clearly distinguished from Cyrillus A in addition to the central mountains (visible in two parts), Cyrillus F to the east of Cyrillus appeared rather vaguely bordered by dark pits, slightly triangular.

The small crater next to Theophilus is Madler.

Figure 1 drawing of the area, Figure 2 photograph.

#Lunar100: 008

Additional information
  • Observation target
    • Moon surface feature
  • Name of the observation target
    • Theophilus, Cyrillus, Catharina
  • Seeing
    • Average
Technical information

Sky-Watcher Skymax-127 (M127 / 1500), SP 10 & 6 mm (150x and 250x). Drawing with Derwent pencils. Photograph taken through a 10 mm eyepiece, stacked and sharpened with Affinity Photo.

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