Nebulosa Cuore IC 1805 (Filippo Bonfante)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 1795 · IC 1805 · NGC 896

Nebulosa Cuore IC 1805, Filippo Bonfante

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Nebulosa Cuore IC 1805

Link to TIFF/FITS: https://www.dropbox.com/s/eyltopdu6qoq2ui/cuore%20finale%20astrobin.tif?dl=0

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Nebulosa Cuore IC 1805

Link to TIFF/FITS: https://www.dropbox.com/s/eyltopdu6qoq2ui/cuore%20finale%20astrobin.tif?dl=0

IC 1805 (nota anche come Nebulosa Cuore o con la sigla W4) è una nebulosa diffusa in associazione ad un ammasso aperto, visibile nella costellazione di Cassiopea, verso il confine con la Giraffa.

È individuabile circa 6 gradi a sud-est della stella ε Cassiopeiae, ma si può individuare anche partendo dall'Ammasso Doppio di Perseo e spostandosi di circa 4-5 gradi in direzione nord-nord-est; fa coppia con un'altra vasta nebulosa, nota come IC 1848. Per poterla individuare occorre un telescopio con un grande diametro, non tanto per le dimensioni, dato che la nebulosa è abbastanza estesa, quanto per la sua debolezza. Una foto a lunga posa o una camera CCD rivelano invece l'oggetto con una certa facilità. L'intero complesso di nebulose visibili in quest'area si presenta circumpolare dalla gran parte delle regioni dell'emisfero boreale; i mesi migliori per la sua osservazione vanno da ottobre ad aprile.

Caratteristiche

Si tratta di una regione HII molto estesa, la cui distanza è stimata sui 7500 anni luce da noi; la sua caratteristica principale è la presenza di due grosse aree apparentemente vuote, di diverse dimensioni, che rendono la nebulosa simile ad un "cuore". Al suo interno si trova un sistema di piccoli ammassi aperti poco concentrati, responsabili della ionizzazione della nebulosa. Il più notevole di questi è Melotte 15, che contiene alcune stelle circa 50 volte più massicce del Sole, più altre più piccole ed un microquasar espulso milioni di anni fa.

Questa e la vicina IC 1848 formano un grande complesso nebuloso noto come complesso W3/W4/W5[1] o "Cuore e Anima"; il "cuore" è IC 1808, mentre l'"anima" è rappresentata da IC 1848.

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C

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