Contact information

Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

NGC 6992 - 27.9.2021 at 23.35 - 28.9.2021 at 02.06 Helsinki Observation number 101650

Visibility IV / V

Tero Hiekkalinna, Ursa (Helsinki)

The third target of the fall was the Eastern Harsosumu, which I have not photographed before. In the description, I used a filter that passes only the emission lines of ionized hydrogen (H-alpha) and oxygen (Oxygen III). In the picture, red represents hydrogen and blue oxygen. Exposure for a total of 4 hours and 20 minutes.



More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • NGC 6992
  • Constellation
    • Cygnus
  • 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.

    • Supernova remnant info

      Supernova remnant is the remnant of the big star died in supernova explosion. The supernova remnants are quite irregularly shaped. Rather many of them ring-like strusture.

      The moderate big instruments and possibly special filters are needed to see supernova remnants.

       

      The Crab Nebula was born in a star explosion in  1054. This is the easiest supernova remnant in the sky to observe. Image Tero Hirvikoski.

       

      The supernova remnant Simesis 147 is in Taurs and Auriga. Image J-P Metsävainio.

       

      The Veil Nebula in Cygnus is wide-area supernova remnant in the sky. There is a detailed image of the boxed area. Image J-P Metsävainio.

       

      This detail of Veil Nebula is known as Pickering's Triangle. Image J-P metsävainio.

       

      A strip of Veil Nebula. Image Rauno Päivinen.

Technical information

Stand: iOptron CEM60
Imaging tube and camera: Sky-Watcher 80ED pro-series + ZWO ASI071MC Pro
Tracking tube and camera: Orion ShortTube 80mm + ZWO ASI120MM mini
Polar Orientation Tube and Camera: Celestron 9 × 50 Viewfinder Telescope + ZWO ASI224MC (Polar Orientation with SharpCap Pro Software)
Sky camera: ZWO ASI120MC
Engine focus: ZWO EAF
Filter: Optolong L-eXtreme
As imaging software I use: NINA - Nighttime Imaging 'N' Astronomy 1.11, PHD2 and Cartes du Ciel.
Image calibration, stacking and processing: PixInsight 1.8

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