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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

IC405 - 8.2.2021 at 00.00 Varkaus Observation number 96251

Visibility V / V

Ville Miettinen, Warkauden Kassiopeia

I filmed this great emission mist on four nights in early February. The cloud situation was a bit challenging as I had to collect exposures from clear cracks for a few hours on several nights - yet I still got about 14 hours of exposure collected.

The image is combined with the narrowband fog and the stars of the RGB image. In the second image, a mere starless narrowband image from which the stars have been removed using the starnet tool.

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Additional information
  • Observation target
    • Deep space object
  • Designation
    • IC405
    • Erittäin näyttävä
  • Constellation
    • Auriga
  • Darkness
    • Good
  • Seeing
    • Average
  • 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

SkyWatcher Esprit 100mm f / 5.5 lens telescope, ZWO ASI1600MM-C, SkyWatcher EQ6 guided with ASI224MC color camera, Baader SHO filters, TS Optics RGB filters. Ha 34x300s, SII 50x300s, OIII 70x300s, R / G / B 10x120s

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