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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

M92 - 13.6.2015 at 02.01 Orimattila, Artjärvi, Tähtikallio Observation number 39034

Visibility II / V

We got an idea from the team for the talkoo activity weekend from 12-14.6 summer observations, a week before midsummer. The spherical star clusters were chosen as the target. The observation device was Artjärvi Tähtikallio's Alluna RC-16 and Sbig STL1001 camera. We first tried the filters, M107 on a dim target. Only with the R filter did we get something visible. H-Alpha was very noisy, Blue B something, L and G saturated. We took 30s of 2s exposures with R-filter from all our subjects. I took pictures with MaximDL v4.5 and my poor handling skills. Image calibration was not successful without working smoothing images. The targets were M107, M10, M12, M14, M13, M92.

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • M92
    • Heikosti näkyvä
  • Brightness in magnitudes
    • 6.3
  • Field of view
  • 25 arc minutes
  • Weather
    • Kuvaus tapahtui viikko ennen juhannusta ,vaalealta kesätaivaalta. Näkyvät tähdet varmaankin lähes kaikki punaisia, johtuen suodattimesta. Muut suodattimet eivät toimineet näissä olosuhteissa.
  • Darkness
    • Bad
  • Seeing
    • Good
  • Star clusters and asterisms
    • Globular cluster info

      Globular cluster is a ball-shaped group of thousand of stars. Typically it looks like a round fuzzy spot. With bigger instruments a part of the stars in the cluster can be seen as sepaterated.


      The globular cluster 47 Tucanae is located in Tucana. Image Arto Oksanen.


      The globular cluster M13 is in Hercules. Image Rauno Päivinen.


      The globular cluster M2 in Aquarius. Image Timo Inkinen.

Technical information

Alluna RC-16, Sbig STL1001 camera. R filter. Exposures 30, 2s each, total exposure 1min.

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