NGC 7635, NGC 7538, M52 - 8.10.2022 at 20.23 - 9.10.2022 at 03.24 Helsinki Observation number 110566

• Observation target
• • Deep space object
• Designation
• • NGC 7635, NGC 7538, M52
• 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.

  • Reflection nebula

    Reflection nebula is gas only lit up by nearby stars. It should not be mix up with emission nebula, where hot stars nearby cause the gas glow. But then reflection nebulae are visible in the same areas with emission nebulae. The appearance of reflection nebulae is irregular, and many of them need bigger instruments to be visible.

     

    

    Reflection nebulae are glowing blue around the stars of Pleyades. Image Juha Parvio.

     

    

    The blue glowing reflection nebula NGC 1333 around the bright star is in Perseus. Image Timo Inkinen.

     

    

    The bluish reflection nebula NGC 2023 is located lower left from the Horsehead Nebula. The Horsehead Nebula itself is a dark nebula in the front of red emission nebula IC 434. In the left side there is NGC 2024 aka Flame Nebula. Image Samuli Vuorinen.

     

    

    NGC 7538 in Cepheus is a combination of reflection and emission nebula. Image Timo Inkinen.

     

    

    Rflection nebulae (LBN 550, 552 and 555) and dark nebulae (LDN 1228) in Cepheus. Image Juha Kepsu.

     

    

    Reclection nebula vdB 141 in Cepheus. Image Tero Turunen.

• 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.

Stand: iOptron CEM60

Image tube and camera: Sky-Watcher 80ED pro-series + Sky-Watcher 0.85x shortener/smoother + ZWO ASI071MC Pro

Filter: Optolong L-eXtreme

Tracking tube and camera: Orion ShortTube 80mm + ZWO ASI224MC

Engine focuser: ZWO EAF

As imaging software I use: NINA - Nighttime Imaging 'N' Astronomy 2.0, PHD2

Image calibration, stacking and processing: PixInsight 1.8.9-1