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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

M101 - 13.4.2015 at 23.30 Helsinki Observation number 36979

Visibility IV / V

Tero Hiekkalinna, Ursa (Helsinki)

I thought the shooting season was over, but I got the Windmill Galaxy photographed for three nights for a total of 7 hours 35 minutes.

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Additional information
  • Observation target
    • Deep space object
  • Designation
    • M101
    • Näyttävä
  • Constellation
    • Ursa Major
  • Darkness
    • Average
  • Seeing
    • Good
  • 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

Celestron EdgeHD 8 + Advanced VX + 0.7x shortener + Canon EOS 500D. The tracking tube is a 9x50 viewfinder tube and the camera is an ASI120MC. Images 92x5min = 7h35min, ISO800. Software; APT, PHD2, PixInsight and DSS.

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