Hickson 100 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7803

Hickson 100

This small galaxy group is located 250 million light years away in the constellation of Pegasus at a declination of +13 degrees. Although more than 4 galaxies are visible here, Hickson 100 is the central 4 galaxies shown in the mouseover.

This object is the last entry in the Hickson catalog of 100 small galaxy groups.

The brightest galaxy of the group is NGC 7803, or Hickson 100a. Hickson convention is that the galaxies are designated alphabetically in order of brightness, started with "a". HIckson 100a is a magnitude 14 galaxy that spans 1.7 arc-minutes in our apparent view, which corresponds to a Milky Way size diameter of 120,000 light years.

The 3 other galaxies in Hickson 100 are also close to 250 million light years away, but perhaps far enough apart so that they are not interacting. Of the 4 Hickson galaxies, only 100b is disturbed and that could be by the faint small galaxy just below and left of it (no distance information is available for it).

Interestingly, the galaxy at the far left edge of the image (LEDA 134) is also about the same distance away as Hickson 100. I think it should have been included as part of the group. It is brighter than 100c and 100d.

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Status	Advanced success
Started	...
Astrometry.net job	5355348
PixInsight job	SAXUG0CR9NIXVRA8NUGJ4JHIWT8M2HU0
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h01m23s.330
RA (top/left)	00h01m53s.745
RA (top/right)	00h00m52s.376
RA (bottom/right)	00h00m52s.340
RA (bottom/left)	00h01m53s.653

Dec (center)	+13°07′53″.57
Dec (top/left)	+13°13′48″.15
Dec (top/right)	+13°13′49″.45
Dec (bottom/right)	+13°01′58″.68
Dec (bottom/left)	+13°01′57″.36

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