IC 1805, NGC 281 - 26.12.2018 at 19.00 - 26.12.2018 at 19.30 Rovaniemi Observation number 79938

• Observation target
• • Deep space object
• Designation
• • IC 1805, NGC 281
• • Näyttävä
• Constellation
• • Cassiopeia
• Darkness
• • Average

• Seeing
• • Average
• 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.

• Star clusters and asterisms
• • Asterism

    An asterism is  a group or a pattern of stars, where the stars are apparently close each other, but in reality there are located far each other

    The star of the asterism are not gravitionally connected, such as in the open and globular cluster.  They only seem to be close each, because they are in the same direction looked from the Earth.

     

    

    Orionin vyön kolme tähteä muodostavat yhdenlaisen asterismin. Kuva Voitto Pitkänen.

  • 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.

Canon 6D astromod, Astronomin CLS, Samyang 85mm f / 1.4, Sky-Watcher Star Adventurer. ISO800, f / 2.5, 35 x 40s. Pixinsight + Lightroom.

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