NGC 7217 (Diaz, Alemany, Iovene) (Salvatore Iovene)

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

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NGC 7217 (Diaz, Alemany, Iovene)

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NGC 7217 (Diaz, Alemany, Iovene)

NGC 7217 is an unbarred spiral galaxy in the constellation Pegasus.

NGC 7217 is a gas-poor system whose main features are the presence of several rings of stars concentric to its nucleus: three main ones -being the outermost one the most prominent and the one that features most of the gas and star formation of this galaxy-, plus several others inside the innermost one discovered with the help of the Hubble Space Telescope, a feature that suggests NGC 7217's central regions have suffered several starbursts, and a very large and massive spheroid that extends beyond its disk.

Other noteworthy features this galaxy has are the presence of a number of stars rotating in the opposite direction around the galaxy's center to most of them and two distinct stellar populations: one of intermediate age on its innermost regions and a younger, metal-poor on its outermost ones.

It has been suggested these features were caused by a merger with another galaxy and, in fact, computer simulations show that NGC 7217 could have been a large lenticular galaxy that merged with one or two smaller gas-rich ones of late Hubble type becoming the spiral galaxy we see today.; however right now this galaxy is isolated in space, with no nearby major companions.

Collaboration between Samuel Díaz Lopez, Jaime Alemany and me.

Imagers of Italy
Cloudy Nights
AstroBin Platform open discussions community forum
Members of AstroCamp in Nerpio, Spain

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Status	Advanced success
Started	...
Astrometry.net job	3382051
PixInsight job	LXUTXIKIEKZX6DQWL9KU4VM4F1KEG9BG
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	22h07m51s.986
RA (top/left)	22h06m47s.784
RA (top/right)	22h09m03s.858
RA (bottom/right)	22h08m56s.454
RA (bottom/left)	22h06m39s.768

Dec (center)	+31°21′33″.92
Dec (top/left)	+31°06′46″.24
Dec (top/right)	+31°08′29″.61
Dec (bottom/right)	+31°36′18″.36
Dec (bottom/left)	+31°34′36″.34

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NGC 7217 (Diaz, Alemany, Iovene)

NGC 7217 (Diaz, Alemany, Iovene)

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NGC 7217 (Diaz, Alemany, Iovene)

NGC 7217 (Diaz, Alemany, Iovene)

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