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Contact information

Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

IC 1805 - 6.10.2015 at 00.30 - 6.10.2015 at 02.06 Tampere Observation number 45588

Visibility III / V

Jouni Raunio, Tampereen Ursa

Test exposures from October.

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • IC 1805
    • Keskitaso
  • Constellation
    • Cassiopeia
  • Field of view
  • 1 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

TS PHOTOLINE Triplet APO 102 / 714mm + TS PHOTOLINE 0.8x Reducer (f / 5.6) @ Skywatcher HEQ-5 Pro Synscan + HitecAstro EQDIR. Starlight Xpress Trius SX-814 (setpoint -30C). Astronomical 1.25 "H-alpha @ SX Mini USB filter wheel 5x1.25" + SX Lodestar autoguider. Focusing USB_Focus + FocusMax. Integration time total 1h 15min (Ha 15 * 5min 2x2bin). Description, pulseguiding and dithering MaxIm DL Pro + EQASCOM. Image processing PixInsight (Calibration: masterbias, no darks, masterflat). Image scale 2.66 arcsec / pixel (original FoV 60x75 arcmin).

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