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Contact information

Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

IC 1805, Melotte 15 - 10.9.2015 at 01.00 Raasepori Observation number 42732

Visibility V / V

Jyrki Grönroos, Ursa (Etelä-Suomi)

Now the mono-1000D would then have been tested for five nights. Colors photographed with the older normally modified 1000D. The tracking accuracy isn't quite right there yet (inclination + pole orientation), but those stars aren't terrible right now. I’ve never before combined luminance and rgb images, nor have I combined H-alpha. Yes, I got a twist for a while to get something sensible combined.

Overall, though, I'm happy with the picture and that can be said to be a win-win. I wonder if the combination of different image data will gradually become familiar. Even when you get cooled in that mono-rider, you could win something in the noise at these outdoor temperatures.

The subject is great to describe with its many details.

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • IC 1805, Melotte 15
    • Erittäin näyttävä
  • 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.

  • Star clusters and asterisms
    • Open cluster info

      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.

Technical information

1000D mono (iso 800), UHC-S 50x400s and H-alpha 19x2400s. 1000D- (rgb) mod (iso 400), UHC-S 30x400s. TS 8 "F5 Newton. EQ6 Pro.

Comments: 1 pcs
Emma Bruus - 17.9.2015 at 09.40 Report this

Upea otos! Sopisi erinomaisesti joulu/talvipäivänseisauskortiksi.

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