Celestial hemisphere:  Northern  ·  Constellation: Camelopardalis (Cam)  ·  Contains:  IC 342
Getting plate-solving status, please wait...
IC 342 The Hidden Galaxy. Imaging Through Dust., Justin Worden
Powered byPixInsight

IC 342 The Hidden Galaxy. Imaging Through Dust.

Revision title: Noise Reduction

Getting plate-solving status, please wait...
IC 342 The Hidden Galaxy. Imaging Through Dust., Justin Worden
Powered byPixInsight

IC 342 The Hidden Galaxy. Imaging Through Dust.

Revision title: Noise Reduction

Equipment

Loading...

Acquisition details

Loading...

Description

When I decided to image this galaxy I only knew it's designation as IC 342. Though I had previously heard of the Hidden Galaxy, I didn't know I was imaging it. I was surprised to see how little signal came through on a single exposure, despite how close the galaxy is and how apparently large it is, and wanted to know why.  It's because it's located close to the galactic center of the milky way, and is hiding behind all of that galactic dust. It absolutely earned its name. I think next year I will add some data but for now, here it is.

From Wiki:
IC 342 (also known as Caldwell 5) is an intermediate spiral galaxy in the constellation Camelopardalis, located relatively close to the Milky Way. Despite its size and actual brightness, its location behind dusty areas near the galactic equator makes it difficult to observe, leading to the nickname "The Hidden Galaxy",[4][1] though it can readily be detected even with binoculars.[5] If the galaxy were not obscured, it would be visible by naked eye. The dust makes it difficult to determine its precise distance; modern estimates range from about 7 mega light-years (Mly)[6] to about 11 Mly.[2] The galaxy was discovered by William Frederick Denning in 1892.[7] 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.[8]

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).[9] (Modern estimates are more conservative, giving the apparent size as one-half to two-thirds the diameter of the full moon).[1][5]

It has an H II nucleus. The galaxy has a diameter of 75,000 light-years.[10]

In 2020, the galaxy KKH 32 was identified as the first known satellite of IC 342 that is a dwarf spheroidal galaxy. Unlike galaxies with large bulges such as the Andromeda Galaxy, IC 342 has a relatively few dwarf satellite galaxies. KKH 32 is located about 10.2 million light-years (3.12 megaparsecs) away, and has a diameter of about 4,300 light-years (1.32 kiloparsecs).[11]

Comments

Revisions

  • IC 342 The Hidden Galaxy. Imaging Through Dust., Justin Worden
    Original
  • Final
    IC 342 The Hidden Galaxy. Imaging Through Dust., Justin Worden
    B

B

Title: Noise Reduction

Uploaded: ...

Sky plot

Sky plot

Histogram

IC 342 The Hidden Galaxy. Imaging Through Dust., Justin Worden

In these public groups

Cloudy Nights