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Contains:  IC 342
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The Hidden Galaxy - IC342 - LRGB, 


            Thomas Richter
The Hidden Galaxy - IC342 - LRGB

The Hidden Galaxy - IC342 - LRGB

Technical card

Resolution: 5276x3543

Dates:Oct. 15, 2018

Baader B 1.25'' CCD Filter: 12x300" (gain: 53.00) -20C bin 1x1
Baader G 1.25'' CCD Filter: 12x300" (gain: 53.00) -20C bin 1x1
Baader L 1.25'' Filter: 22x300" (gain: 53.00) -20C bin 1x1
Baader R 1.25'' CCD Filter: 15x300" (gain: 53.00) -20C bin 1x1

Integration: 5.1 hours

Darks: ~31

Flats: ~27

Avg. Moon age: 6.26 days

Avg. Moon phase: 38.16% job: 2315993

RA center: 3h 46' 48"

DEC center: +68° 5' 13"

Pixel scale: 0.494 arcsec/pixel

Orientation: 267.115 degrees

Field radius: 0.436

Locations: Nürnberg, Nürnberg, Bayern, Germany

Data source: Backyard


Object description (

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 Group. Edwin 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).



Thomas Richter
License: None (All rights reserved)


  • The Hidden Galaxy - IC342 - LRGB, 


            Thomas Richter
  • Final
    The Hidden Galaxy - IC342 - LRGB, 


            Thomas Richter

Sky plot

Sky plot


The Hidden Galaxy - IC342 - LRGB, 


            Thomas Richter