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Contact information

Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

IC 1805 Sydänsumu - 1.10.2011 at 21.20 - 2.10.2011 at 01.30 Akaa, Kylmäkoski Observation number 309

Visibility IV / V

Marko Järvinen, Ursa (Länsi-Suomi)

The opening of the star shooting season dragged on this year to the bright weekend of the turn of September-October. My first targets of the season were IC 1805 Heart Fog. The narrowband image has a total exposure of 3 h 20 min



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Additional information
  • Observation target
    • Deep space object
  • Designation
    • IC 1805 Sydänsumu
    • Näyttävä
  • Constellation
    • Cassiopeia
  • 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.

Technical information

Ha OIII, SII 80:60:60. Sky-Watcher 80 ED, William Optics V3 Reducer / flattener, Atik 314L + and HEQ-5.

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