Arp 90 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Boötes (Boo) · Contains: NGC 5929 · NGC 5930 · PGC 2186097 · PGC 55095

Arp 90

This object is a pair of spiral galaxies located 130 million light years away in the constellation of Bootes at a declination of +42 degrees. NGC 5929 is lower right and NGC 5930 is upper left. Dr. Arp put this object into the category of “Spiral galaxies with large high surface brightness companions”.

NGC 5930 is the larger galaxy. It spans 2 arc-minutes in our apparent view, which corresponds to an actual diameter of 75,000 light years. It has interesting color – a yellow core surrounded by an inner region of 2 distinct blue arms, which itself is surrounded by a disk that is more yellow.

Sources say that these galaxies are interacting. I am not so sure. Neither galaxy appears to be disturbed and I don’t see any extended star streams as I would expect if they were interacting.

I love the object at upper left, the blue irregular galaxy UGC 9857. I don’t remember seeing another galaxy with this same structure.

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Description: Comparison to Original Arp Image

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Status	Advanced success
Started	...
Astrometry.net job	3723665
PixInsight job	8SO623XPLD6FSL9R1II8QX037C40MZQ0
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	15h26m08s.117
RA (top/left)	15h26m51s.698
RA (top/right)	15h25m38s.488
RA (bottom/right)	15h25m24s.602
RA (bottom/left)	15h26m37s.633

Dec (center)	+41°40′35″.83
Dec (top/left)	+41°43′27″.90
Dec (top/right)	+41°47′13″.30
Dec (bottom/right)	+41°37′42″.69
Dec (bottom/left)	+41°33′57″.91

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Arp 90

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