C14 - Doppio Ammasso di Perseo - NGC 869 ( η Per ) /NGC 884 ( χ Per ) (Riccardo Sgaramella)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: 10 Per · 7 chi Per · 8 Per · B201 · Double cluster · Misam · NGC 869 · NGC 884 · The star 7Per · The star 8Per · chi Persei Cluster · h Persei Cluster

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C14 - Doppio Ammasso di Perseo - NGC 869 ( η Per ) /NGC 884 ( χ Per )

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C14 - Doppio Ammasso di Perseo - NGC 869 ( η Per ) /NGC 884 ( χ Per )

E' una coppia di ammassi aperti molto luminosi, visibili nella costellazione di Perseo; devono il loro nome comune alla loro estrema vicinanza e somiglianza. Possiedono pure una lettera di riferimento (h e χ), nonché numeri di catalogo indipendenti (NGC 869 e NGC 884).

Sono ben visibili ad occhio nudo come una macchia chiara allungata con una strozzatura centrale, che le conferisce la forma di un "8" rovesciato. χ Per è dominato da due stelle di settima magnitudine a nord, h Per presenta due stelle di settima ad ovest. Entrambi gli ammassi mostrano al loro interno una ventina di supergiganti rosse, che contrastano con il colore azzurro delle altre componenti.

Si tratta di due degli oggetti più fotografati del cielo. Entrambi sono ammassi giovani, dell'età compresa fra 3 e 6 milioni di anni, e distano fra loro circa 800 anni luce; il fatto che siano visibili così chiaramente anche da grande distanza (il nostro sistema solare si trova ad oltre 7000 anni-luce da loro) è indice di una grande luminosità reale, come pure le loro dimensioni, stimate intorno ai 70 anni-luce di diametro per entrambi gli oggetti.

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Description: Immagine con annotazione astrometrica dal software PixInsight dove ha inclusi anche il catalogo PGC rendendo visibile cosi anche le galassie presenti in questo campo inquadrato

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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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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	4029586
PixInsight job	P0PW4ZTYHT88NIU87IPDQQ4HB8JJ2RWH
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	02h21m00s.87
RA (top/left)	02h12m36s.96
RA (top/right)	02h30m07s.49
RA (bottom/right)	02h29m50s.49
RA (bottom/left)	02h11m31s.95

Dec (center)	+57°09′33″.3
Dec (top/left)	+56°15′01″.8
Dec (top/right)	+56°23′00″.10
Dec (bottom/right)	+58°01′53″.3
Dec (bottom/left)	+57°53′30″.4

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C14 - Doppio Ammasso di Perseo - NGC 869 ( η Per ) /NGC 884 ( χ Per )

C14 - Doppio Ammasso di Perseo - NGC 869 ( η Per ) /NGC 884 ( χ Per )

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C14 - Doppio Ammasso di Perseo - NGC 869 ( η Per ) /NGC 884 ( χ Per )

C14 - Doppio Ammasso di Perseo - NGC 869 ( η Per ) /NGC 884 ( χ Per )

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