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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

IC 1805 (Sydänsumu) - 5.11.2016 at 00.30 Rovaniemi Observation number 58187

Visibility IV / V

Lauri Turunen, Corona Borealis, Rovaniemi

Finally, last night in Rovaniemi, everything was in place: suitably frost, the sky completely clear, not disturbing the northern lights or the super moon!

With my new autogued 347mm telescope + modified 650D + CLS filter, I took 30 360-second exposures with ISO400 sensitivity and the same number of possible corrections (dark, flat, dark flat and bias). The whole shooting process took 8 hours!

I let the DS stacker stack all the images with the standard settings and adjusted the colors with GIMP. I am pleased to say that the hard work has not been wasted and the end result is at least satisfactory for a beginner!

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Additional information
  • Observation target
    • Deep space object
  • Designation
    • IC 1805 (Sydänsumu)
    • Näyttävä
  • Constellation
    • Cassiopeia
  • Darkness
    • Good
  • Seeing
    • Excellent
  • Nebulae
    • Emission nebula info

      In an emission nebula the hot stars nearby cause the gas glow. This should not mix with reflection nebula, where the gas is only lit up by nearby stars.

      The appearance of a gas nebula is irregular, and the fainter parts of it need bigger instruments to be visible.


      Emssion nebulae in Cepheus. The bigger part is composed of the nebulae Cederblad 214 (Ced214) and NGC 7822. The lower round nebula is called Sharpless 170 (Sh2-170). Image J-P Metsävainio.


      The Orion nebula. Image Samuli Vuorinen.


      In this 4-degree-field there are emission nebulae Sh2-157, Sh2-158, Sh2-159, Sh2-161 and Sh2-162 (or NGC 7635 aka Bubble Nebula) and open clusters M52 and NGC 7510. Image Juha Kepsu.


      NGC 281 aka Pacman Nebula. The object is in Cassiopeia. Image J-P Metsävainio.


      NGC 896 in Cassiopeia is the tip of Heart Nebula (IC 1805). Image Timo Inkinen.

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