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  1. Galleries
  2. »
  3. Astrophotography
  4. » M17- Omega Nebula

 
M17- Omega Nebula...

Nebulose

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M17- Omega Nebula sent on January 20, 2025 (8:39) by Giancarlo Melis. 20 comments, 878 views.  [editors pick] [retina]

Visibile anche al binocolo, la nebulosa "Omega", catalogata da Charles Messier come M17, è una delle nebulose ad emissione più luminose osservabili. Situata nella costellazione del Sagittario, verso est-sud-est, alle mie latitudini raggiunge la sua massima elevazione di 34° circa alla fine di giugno, per poi ricalare nelle settimane successive, fino a diventare nuovamente inosservabile. La sua luminosità l'ha resa uno dei soggetti più fotografati in passato, tanto da avere spesso un posto nei classici libri di astronomia. Da bambino è sempre stato uno di quei soggetti nei quali mi perdevo, osservando le immagini stampate sui vecchi libri; M17 dista da noi circa 6.000 anni luce. L'immagine che vedete ora, è in realtà ciò che fu nel periodo in cui aveva inizio l'età del bronzo, fiorivano le prime civiltà urbane in Mesopotamia e in Egitto, e iniziava a diffondersi la scrittura con i primi geroglifici e le rappresentazioni cuneiformi. La nebulosa Omega, chiamata anche nebulosa Cigno, nebulosa Aragosta e nebulosa Ferro di cavallo, è una zona HII, ovvero una zona ricca di nubi interstellari di gas ionizzato, in questo caso parliamo di idrogeno i cui atomi, a causa delle radiazioni ultraviolette delle vicine stelle massicce, perdono l'unico elettrone, diventando protoni con elettrone libero (vengono appunto ionizzati). La lunghezza d'onda emessa in HII è tipicamente rossastra. Contrariamente a quanto si possa pensare, l'elevata luminosità di questa nebulosa non la rende facilmente fotografabile, poiché la differenza di intensità fra il nucleo e le flebili nebulosità esterne mette alla prova la gamma dinamica del sensore di ripresa, pertanto è molto facile bruciare il nucleo o perdere i dettagli dei filamenti esterni. L'immagine che ho caricato è stata ripresa con l'ormai collaudata strumentazione: astrografo Celestron RASA 8 (400mm f/2), la camera di ripresa ASI 183 MC-Pro e il filtro a doppia banda stretta IDAS NBZ. Questa immagine è il risultato dell'integrazione di 160 scatti da 2 minuti ciascuno in banda stretta (a f/2). Elaborazione in banda stretta.


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avatarsenior
sent on January 20, 2025 (8:57) | This comment has been automatically translated (show/hide original)

Remarkable!.... The quality of the sky helps a lot but everything else is done by the photographer.

Congratulations Gp

avatarsupporter
sent on January 20, 2025 (16:37) | This comment has been automatically translated (show/hide original)

Spectacular Giancarlo! Great job, as usual

avatarsupporter
sent on January 21, 2025 (0:41) | This comment has been automatically translated (show/hide original)

Another work, like the others, of great depth and charm.

avatarsupporter
sent on January 21, 2025 (9:41) | This comment has been translated

Marvelous, congratulations!

avatarjunior
sent on January 21, 2025 (12:35) | This comment has been automatically translated (show/hide original)


avatarsupporter
sent on January 21, 2025 (21:11) | This comment has been automatically translated (show/hide original)

sidereal amazement

avatarsenior
sent on January 21, 2025 (23:12) | This comment has been automatically translated (show/hide original)

Thank you all.
I'm glad you like the image:)

avatarsenior
sent on January 23, 2025 (12:23) | This comment has been automatically translated (show/hide original)

Very beautiful, a good detail in every part of the nebula. Congratulations Giancarlo

avataradmin
sent on February 05, 2025 (6:45) | This comment has been automatically translated (show/hide original)

Charming! Great detail even in the full resolution version!

avatarsenior
sent on February 05, 2025 (8:22) | This comment has been translated

Marvelous photo, congratulations!

avatarsupporter
sent on February 05, 2025 (8:26) | This comment has been automatically translated (show/hide original)

A great job behind this shot repaid by a remarkable result
Massimo

avatarsupporter
sent on February 05, 2025 (8:52) | This comment has been translated

Excellent!

avatarjunior
sent on February 05, 2025 (11:16) | This comment has been automatically translated (show/hide original)

What am I seeing?!? It's gorgeous... Incredible to think that this abstract painting is up there in our skies

avatarjunior
sent on February 05, 2025 (11:22) | This comment has been translated

Great shot!

avatarsenior
sent on February 05, 2025 (13:51) | This comment has been automatically translated (show/hide original)

Excellent, it is also depicted on the cover of the album Islands by King Crimson !!

avatarsupporter
sent on February 05, 2025 (17:04)

Gorgeous capture!
Excellent close up, good details and good color rendition!
Wonderful work!
Hello: Delphinus

avatarsenior
sent on February 05, 2025 (17:14) | This comment has been automatically translated (show/hide original)

Yet another masterpiece Giancarlo, many congratulations

avatarjunior
sent on February 05, 2025 (20:56) | This comment has been automatically translated (show/hide original)

The study, commitment and patience behind this image are incredible, congratulations!

avatarsenior
sent on February 06, 2025 (9:26) | This comment has been automatically translated (show/hide original)

Thank you for your very welcome comments, and I thank Juza for the recognition! :)

avatarsupporter
sent on February 06, 2025 (11:45) | This comment has been translated

Fantastic!


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