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Ursa Astronomical Association
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Ursa Astronomical Association

IC 342 - 13.11.2012 at 21.00 Hyvinkää Observation number 30857

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Timo Inkinen, Ursa (Etelä-Suomi)

Usually I don’t rework my old images (image from 2012), but there was so much left in this tooth’s Giraffe galaxy that this was forced to be taken back to the desktop with new skills and methods to work on. The IC 342 galaxy is also known as "The Hidden Galaxy" because it is visible directly from the top of the galaxy disk, i.e. it is visibly hidden behind the stars due to its low surface brightness. I needed a total of 7h 25min exposure (15min and 8min as partial exposures) before this model example of spiral galaxies revealed its secret well enough.

Old picture here:

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Additional information
  • Observation target
    • Deep space object
  • Designation
    • IC 342
    • Erittäin heikosti näkyvä
  • Constellation
    • Camelopardalis
  • Galaxies
    • Spiral galaxy info

      Spiral galaxy is a stellar system where there are outwards arched spiral arms from roundish (spiral galaxies) or bar-shaped (barred spiral galaxies) central condensation.

      The apparent shape of spiral galaxied depends on out observation direction. From above they are quite round. From the side they lens-shaped with a bulge in the middle.

      Generally a rather large instrument, good weather conditions and observational expereince are needed to see spiral arms. Usually spiral galaxies look like a fuzzy spots.

      Spiral galaxy M33 in Triangulum. Image Tero Turunen.


      Andromeda Galaxy M31. There are also galaxies M110 (upper right corner) and M32 (lower left corner) in this image. Image Pekka Peura.

      M101 aka Pinwheel Galaxy in Ursa Major. Image Samuli Vuorinen.


      Spiral galaxy IC 342 aka Hidden Galaxy in Camelopardalis. Image Timo Inkinen.

      A sketch of spiral galaxy NGC 7331 in Pegasus. Image Juha Ojanperä.

Technical information

I shot in 2012 with a large 300 / 1500mm Newtonian telescope and the camera was still my current QSI 583ws CCD camera. The light shot through the Ha filter has been added to the standard LRGB image (in this way I got better exposure to the emission mists glowing red in the spiral arms of the galaxy).

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