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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Fracastorius - 26.9.2021 at 00.10 - 26.9.2021 at 00.20 Vantaa, Pähkinärinne Observation number 101453

Visibility IV / V

Paula Wirtanen, Ursa (Helsinki)

The moon was rising. The intention would be to explore the diverse area of Mare Necatris. The area of Mare Nectaris was therefore exceptionally interesting. Clearly, the terminator stood out Fracastorius, whose uneven base brightness was noticed very clearly this time, despite the poor seeing.

Fracastorius is a bay-like extension to Mare Nectaris and has no central mountain and its northern edge is covered.

Figure 1 drawing of Fracastorius. It is worth comparing the drawing observation made by Jari Kuula at the same time, which is more accurate. However, the same details are visible.

Figure 2 Photograph of the area taken through the eyepiece. The edges of the Nectaris basin were also very nicely visible, including the Rupes Altai. The Piccolomini crater was in the shadows, Stiborius, slightly down from it, visible in the light of the tops of the curbs as a ring in its own pit. Nomenclature added to photo. In the photograph and drawing, north is at the top and east at the right.

#Lunar100: 007 Rupes Altai
#Lunar100: 021 Fracastorius

Additional information
  • Observation target
    • Moon surface feature
  • Name of the observation target
    • Fracastorius
  • Seeing
    • Mediocre
Technical information

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

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