NGC-7217 (Joel Shepherd)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7217

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NGC-7217

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NGC-7217

The second in my series of "Galaxies that are Too Small for my Telescope", this is NGC-7217 in the constellation Pegasus. NGC-7217 is a rather isolated galaxy about 50 million light-years distant: a "flocculent" (heh) spiral galaxy with three concentric rings of stars, older stars in the center and younger stars in the blueish outer regions. The galaxy actually extends well beyond the blue ring, albeit faintly, which there are just hints of here. Interestingly, different areas of the galaxy appear to be rotating in different directions, and the stars in the outer parts of the galaxy appear to be different ages from those near the center, leading to the hypothesis that NGC-7217 might actually have been formed from the merger of two smaller galaxies.

This image was composed of about 9 hours of RGB images from mid-August, in urban Seattle. Given the number of exposures and lack of moonlight, I'm a little disappointed by the amount of noise in the background. On the other hand, the star reduction script in the new "EZ Processing" scripts for PixInsight worked wonders for tightening up the stars.

The refractors!
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Status	Advanced success
Started	...
Astrometry.net job	4059035
PixInsight job	0K6BK5X7IW7MIAQMSCB6JQEJHHN2NIW7
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	22h07m52s.30
RA (top/left)	22h08m47s.88
RA (top/right)	22h08m37s.85
RA (bottom/right)	22h06m55s.91
RA (bottom/left)	22h07m06s.46

Dec (center)	+31°21′35″.3
Dec (top/left)	+31°07′55″.7
Dec (top/right)	+31°36′52″.6
Dec (bottom/right)	+31°35′13″.4
Dec (bottom/left)	+31°06′17″.0

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NGC-7217

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