NGC 7331 + Stephan quintet (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7317 · NGC 7318 · NGC 7319 · NGC 7320 · NGC 7331 · NGC 7335 · NGC 7337 · NGC 7340

NGC 7331 + Stephan quintet, Alberto Tomatis

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NGC 7331 + Stephan quintet

NGC 7331 e quintetto di Stephan

NGC 7331 , scoperta da William Herschel nel 1784, è una galassia a spirale situata nella costellazione di Pegaso. Questa galassia ha braccia a spirale e un piccolo nucleo che ruota di intorno al disco principale. Con una massa di circa 300 miliardi di Soli questa la rende più grande la nostra Via Lattea. Le galassie più piccole sullo sfondo sono circa 10 volte più lontano e identificato come ( LR) NGC 7337 (ASA , Mag. . 15.7) , NGC 7.335 ( lenticolare , Mag.14.5 ) e NGC 7336 ( a spirale, Mag. 15.4) . La parte superiore sinistra è galassia NGC 7340 (Compact , Mag. 14.9) . La galassia più piccola sotto NGC7331 è MAC2236 3.422 .

Il Quintetto di Stephan è un gruppo visuale di cinque galassie situato in direzione della costellazione di Pegaso. Il gruppo è il primo gruppo di galassie mai scoperto: fu scoperto dall'astronomo francese Édouard Stephan nel 1877 all'Osservatorio di Marsiglia ed è il più studiato di tutti i gruppi compatti di galassie.Il membro più luminoso è la galassia a spirale NGC 7320.

Secondo alcuni studi, non tutte queste galassie si troverebbero realmente vicine fra loro: infatti NGC 7320 si trova in sovrapposizione casuale per via della nostra linea di osservazione, mentre le restanti sembrano essere relativamente vicine fra loro.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Astrometry.net job	6435521
PixInsight job	n/a
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