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Ursa Astronomical Association

NGC 6960 - 1.11.2021 at 19.00 - 1.11.2021 at 22.40 Kirkkonummi, Komakallio Observation number 101998

Visibility IV / V

Samuli Vuorinen, Kirkkonummen komeetta

Despite the cloudy weather in the fall, I photographed a two-part mosaic of Harsosumu, a large supernova remnant in the constellation of Swan. The image was taken with 3 nm narrowband filters. H-alpha images were shot during the full moon on October 18th. O-III and S-II images are described on 1.11. at about the new moon. During the filming, a thin cloud of overhead sailed in the sky, so transparency was not at its best.

The exposure on both mosaic panels is only 50 minutes per filter, which is much less than I hoped for, but the weather is what it is.

The second image of the observation is an experimental starless version of the original.

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • NGC 6960
  • 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

Sky-Watcher Esprit 100ED telescope, APM Riccardi 0.75x focal length reducer, Chroma 3 nm narrowband filters, ZWO ASI2600MM camera, iOptron CEM60 tripod.

The image is a mosaic of two panels. Both panels have light for only 50 minutes per filter, described in 10-minute sections. Thus, the total image is exposed for 5 hours.

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