Contact information

Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

M23 - 10.9.2021 at 21.58 Orimattila, Artjärvi, Tähtikallio Observation number 101956

Visibility II / V

Toni Veikkolainen, Keski-Uudenmaan Altair

The spherical constellation in the northern part of Sagittarius was reasonably successful, although there were problems with the Trifid and Lagoon Nebulae. Slightly stretched dispersion of stars.



More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • M23
  • Constellation
    • Sagittarius
  • Field of view
  • 28 arc minutes
  • Weather
    • Kuu horisontin alla, hieman auringonvaloa vielä taivaalla

  • Darkness
    • Average
  • Seeing
    • Good
  • Limiting magnitude
    • 5.5
  • Star clusters and asterisms
    • Open cluster info

      Open cluster is an irregular group of tens or hundreds of stars. It can be visible as separate stars or a bit fuzzy spot with small instrument.

      There is the open cluster M52 on the right edge of the image. The red emission nebula is the Bubble Nebula. Image Jyrki Grönroos.

       

      The open cluster M45 aka Pleyades. Image Juha Parvio.

       

      The pair of the open clusters NGC 869 and NGC 884 aka the Double Cluster in Perseus. Image Lauri Kangas.

       

      M34 is also an open cluster in Perseus. Image Teppo Laitinen.

       

      The Wild Duck Cluster M11 is an exceptional dense open cluster. Image Jaakko Asikainen.

       

       

      The Ptolemy's Cluster M7 is located in a rich-star area of The Milky Way in Sagittarius. Image Toni Veikkolainen.

Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000 EC Mark II, with filter L 11 x 30 s, 20 x bias, 20 x dark, 12 x flat, 3x binning, image cropped

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