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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

M81 - 21.3.2022 at 23.00 Kirkkonummi, Komakallio Observation number 105861

Visibility IV / V

Samuli Vuorinen, Kirkkonummen komeetta

I photographed these traditional spring objects Messier 81 and Messier 82 with the dream of also seeing the dimly visible Integrated Flux Nebula (IFN) around the galaxy, which is made up of clouds of gas and dust illuminated by the entire Milky Way and not a single star. Surprisingly, that then finally came to light, although the images may not take terribly close viewing even after 13 hours of exposure.

I collected exposures for this project on a total of three different nights during March.

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Additional information
  • Observation target
    • Deep space object
  • Designation
    • M81
  • Constellation
    • Ursa Major
  • 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.

    • Irregular galaxy info

      Irregular galaxy is a stellar system without clear organized structure.

      Irregular galaxy IC 10 in Cassiopeia. Image Rauno Päivinen.

      Large Magellanic Cloud is the third nearest galaxy. Image Toni Veikkolainen.

Technical information

Sky-Watcher Esprit 100ED telescope with APM Riccardi 0.75x focal length reducer, ZWO ASI2600MM camera and Chroma LRGB filters. Exposure for a total of 770 minutes, in 5 minute increments.

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