Arp 100 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Cetus (Cet) · Contains: IC 18 · IC 19

Arp 100

This object is a pair of interacting galaxies located 270 million light years away in the constellation of Cetus at a declination of -12 degrees. Dr. Arp classified this object in his Arp Catalogue in the category of “Spiral galaxies with elliptical companions”. IC 18 is the disturbed spiral galaxy at the center, while IC 19 is the elliptical galaxy below and slightly left of it.

The main disk of the spiral galaxy spans 1 arc-minute in our apparent view, which corresponds to an actual diameter of 80,000 light years. Its star stream extends for over 300,000 light years! I love star streams.

Almost as interesting as the star stream is the dark band which cuts through the galaxy, giving the appearance that the star stream is slicing the galaxy in half like a big cleaver.

This is one of those fields of view where the background galaxies far outnumber the foreground stars.

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Description: Comparison to Original Arp Image

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Status	Advanced success
Started	...
Astrometry.net job	4003173
PixInsight job	GGW0OP4CNH5OZPJYHGJLUITZGTQP4YXQ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	00h28m34s.817
RA (top/left)	00h29m03s.273
RA (top/right)	00h28m03s.680
RA (bottom/right)	00h28m06s.335
RA (bottom/left)	00h29m05s.979

Dec (center)	-11°34′59″.25
Dec (top/left)	-11°28′24″.68
Dec (top/right)	-11°29′11″.18
Dec (bottom/right)	-11°41′33″.61
Dec (bottom/left)	-11°40′47″.40

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Arp 100

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