NGC 6888 Crescent nebula C 27 (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · NGC 6888

NGC 6888 Crescent nebula C 27, Alberto Tomatis

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NGC 6888 Crescent nebula C 27

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NGC 6888 Crescent nebula C 27

NGC 6888 (nota anche come Crescent Nebula o con la sigla C 27) è una nebulosa diffusa visibile nella parte meridionale della costellazione del Cigno.

Si individua 2,5 gradi a sud-ovest della stella γ Cygni, subito ad ovest di un ricchissimo campo stellare, in cui sono inclusi oggetti come M29 e IC 4996.

La parte più intensa della nebulosa si trova ad occidente, e forma un arco esteso più in declinazione che in ascensione retta; questa caratteristica

ha fatto sì che la nebulosa fosse chiamata crescente, poiché presenta la "gobba" a ponente, come la Luna in fase crescente.

Per individuarla occorre un telescopio, anche se di piccola apertura; un binocolo consente di intravederla appena in condizioni di cielo nitido.

La nube risplende per riflessione, a seguito dell'energia ricevuta durante l'esplosione della stessa supernova.

Nel giro di pochi millenni si prevede che l'oggetto svanirà del tutto, disperdendosi nel mezzo interstellare. I gas della nebulosa appaiono centrati su una stella di Wolf-Rayet (HD 192163),

che si trova ora al suo interno; questa stella sarebbe anche la responsabile della nebulosa, che costituirebbe il materiale degli strati più esterni della stella espulsi, che avrebbero

poi colliso con altre nebulose creando così la forma che si osserva. Secondo altri studi si tratterebbe invece di un resto di supernova la cui stella progenitrice faceva parte del sistema

di HD 192163. La nebulosa si estende nello spazio per una dimensione di circa 16 anni luce.

E' distante da noi di circa 5000 anni luce

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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	Basic success
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Astrometry.net job	6935370
PixInsight job	n/a
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NGC 6888 Crescent nebula C 27

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