IC 1805 - 12.11.2022 at 22.39 - 13.11.2022 at 04.06 Kirkkonummi, Komakallio Observation number 110761

• Observation target
• • Deep space object
• Designation
• • IC 1805
• Constellation
• • Cassiopeia

• 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.

  • Planetary nebula

    Planetary nebula is the remnant of a death star. It could be ring-shaped, disc-like or spread out rather irregularly.

    With the exception of some nearest objects planetary nebulae have a small apparent diameter and they need a rather big instrument to be visible.

     

    

    Planetary nebula M27 aka The Dumbbell Nebula in Vulpecula. Image Juha Parvio.

     

    

    M76 aka The Little Dumbbell Nebula in Perseus. Image Rauno Päivinen.

  • Dark nebula

    Dark nebulae are dust in space. It obsruct the visibility of background star and bright nebulae. Thus, the dark nebulae are seen as dark clouds in space.

     

    

    The Horsehead Nebula is a dark nebula. Image Arto Murtovaara.

     

    

    The dark nebula LDN 1235 in Cepheus. Image Juha Kepsu.

     

    

    The dark nebula LDN 1302. Image Tero Turunen.

     

    

    The NGC 1333 is a reflection nebula, which includes also dark nebulae. Image Samuli Vuorinen.

• Star clusters and asterisms
• • Open cluster

    Open cluster is an irregular group of tens or hundreds of stars. It can be visible as separate stars or a bit fuzzy spot with small instrument.
    
    

    

    There is the open cluster M52 on the right edge of the image. The red emission nebula is the Bubble Nebula. Image Jyrki Grönroos.

     

    

    The open cluster M45 aka Pleyades. Image Juha Parvio.

     

    

    The pair of the open clusters NGC 869 and NGC 884 aka the Double Cluster in Perseus. Image Lauri Kangas.

     

    

    M34 is also an open cluster in Perseus. Image Teppo Laitinen.

     

    

    The Wild Duck Cluster M11 is an exceptional dense open cluster. Image Jaakko Asikainen.

     

     

    

    The Ptolemy's Cluster M7 is located in a rich-star area of The Milky Way in Sagittarius. Image Toni Veikkolainen.

Sky-Watcher Esprit 100ED telescope with APM Riccardi 0.75x focal length reducer, Chroma 3 nm narrowband filters and ZWO ASI2600MM camera.

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