IC 1805 Sydänsumu - 22.9.2018 at 21.00 - 23.9.2018 at 05.00 Laukaa Observation number 77897

Visibility IV / V

Erik Pirtala, Tampereen Ursa

Despite the strong gusts of wind and the full moon, I was forced to get to shoot when the opportunity arose for a long time. Heart Mist was selected as the target. With a meter focal length, the entire fog doesn’t fit in the picture, so it took a while to come up with a good composition. In this picture, the total exposure is just over 5 hours.

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9 8

Additional information

Observation target
- Deep space object
Designation
- IC 1805 Sydänsumu
- Näyttävä
Constellation
- Cassiopeia
Field of view
40 arc minutes

Darkness
- Mediocre
Seeing
- Average
Limiting magnitude
- 4
Nebulae
- Emission nebula
  
  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

GSO 8 "f5 Newton EQ-6 ASI1600MM-C 260x46s = 3h 20min H-alpha 160x46s = 2h O-III

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IC 1805 Sydänsumu - 22.9.2018 at 21.00 - 23.9.2018 at 05.00 Laukaa Observation number 77897