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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

IC 1805 - 4.10.2015 at 21.30 - 5.10.2015 at 05.26 Tampere Observation number 45390

Visibility III / V

Jouni Raunio, Tampereen Ursa

Test image from early October bright with slightly longer partial exposures.

Photos: main image .

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Additional information
  • Observation target
    • Deep space object
  • Designation
    • IC 1805
    • Keskitaso
  • Constellation
    • Cassiopeia
  • Field of view
  • 2 degrees
  • 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

Takahashi FSQ-106ED + Reducer QE 0.73x (f / 3.65) @ Skywatcher EQ6Pro SynScan + EQDIR. Starlight Xpress Trius SX-694 (setpoint -25C). Astrodon H-alpha 3nm @ SX USB filter wheel 7 * 1.25 ". SX OAG + SX Lodestar autoguider. Focusing Seletek Armadillo 2 and FocusMax. Total integration time 3h (Ha 9 * 20min 1x1bin). Description, pulseguiding and dithering MaxIm DL Pro + EQMOD Image Processing PixInsight (Calibration: masterbias, no darks, masterflat) Image scale 2.41 "/ pixel (original FoV 88.6 x 110.8 arcmin).

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