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Ursa Astronomical Association

NGC 281 - 27.9.2021 at 00.00 Nakkila Observation number 101708

Visibility IV / V

Tomi Kurri, Porin Karhunvartijat

NGC 281, or Pacman Nebula, located in the constellation of Cassiopeia, is an emission nebula and consists mainly of hydrogen. At a distance, the fog is about 9,200 light-years away from us.

I photographed the subject on several autumn evenings and the data was collected in both RGB and narrowband. The total exposure time of the image is 5.5 hours.

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • NGC 281
  • Constellation
    • Cassiopeia
  • 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.

Technical information

Celestron RASA 8, ZWO ASI 183MC Pro, iOptron GEM 45. Optolong L-Pro and L-eNhance filters. Image processing DSS and Pixinsight.

Comments: 2 pcs
Pekka Parviainen - 6.10.2021 at 23.22 Report this

Pikkunätti, jota on mukava verrata omiin kameraoptiikkakuviin ja näin tunkeutua syvemmälle ja kauniimpaan maisemaan kuin mitä kamera h-alfa rakeista saa kasaan.

Tomi Kurri - 7.10.2021 at 22.04 Report this

Kiitoksia! Pacman on kyllä todella upea kohde, pidän itse sen väreistä todella paljon.

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