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Name / Constellation

IC 342

Other: C 5, UGC 2847, PGC 13826


Coordinates AR: 03h 46m 48.5s - Dec: +68° 05′ 46″
Optics Takahashi FSQ 106N APO Fluorite F5 - 60/220 guiding refractor
Camera-Mount SBIG STF8300M - Orion StarShot Guider - 10Micron GM2000 QCI Mount
Filters Baader LRGB
  • Luminance
  • Red
  • Green
  • Blue
  • 16 x 900 sec - 4 hours
  • 9 x 600sec - 90 min
  • 9 x 600 sec - 90 min
  • 9 x 600 sec - 90min
Location / Date Promiod (Valle D'Aosta-Italy) "TLP" Remote Observatory - 109 oct (Lum) and 13 oct (RGB) 2018
Seeing 2 -3" @ 2.1 arcosec/pixel unbinned
Acquisition MaxIm DL - CCD Autopilot 5
Processing Adobe Photoshop CS6 -

IC 342 (also known as Caldwell 5) is an intermediate spiral galaxy in the constellation Camelopardalis relatively close to the Milky Way. Despite its size and actual brightness, its location in dusty areas near the galactic equator makes it difficult to observe, leading to the nickname "The Hidden Galaxy", though it can readily be detected even with binoculars. The dust makes it difficult to determine its precise distance; modern estimates range from about 7 Mly to about 11 Mly. The galaxy was discovered by William Frederick Denning in 1892. It is one of the brightest in the IC 342/Maffei Group, one of the closest galaxy groups to the Local GroupEdwin Hubble first thought it to be in the Local Group, but it was later determined not to be a member. In 1935, Harlow Shapley found that it was wider than the full moon, and by angular size the third-largest spiral galaxy then known, smaller only than the Andromeda Galaxy (M31) and the Triangulum Galaxy (M33). (Modern estimates are more conservative, giving the apparent size as one-half to two-thirds the diameter of the full moon). It has an H II nucleus.