The colorful whirlwind on the Rockmelon!

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Landscape (wilderness)

The colorful whirlwind on the Rockmelon! ...

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Astrofoto e cielo View gallery (22 photos)

The colorful whirlwind on the Rockmelon! sent on November 05, 2019 (20:44) by Aleziggio. 4 comments, 984 views.

, Posa B tripod.

Quanti colori hanno le stelle? :) Praticamente tutti quello dello spettro visibile! Di solito le stelle vengono viste come dei puntini bianchi su sfondo nero, ma in effetti lo spettro di emissione nel visibile di una stella è piccato su lunghezze d'onda che dipendono dalla composizione e soprattutto dalla temperatura superficiale della stella. In ossequio alla legge di Planck, le stelle più calde avranno una colorazione tendente al blu, mentre quelle più "fredde" (parliamo di un freddo relativo, ovviamente!) tenderanno al rosso-arancio. Avevo già messo insieme una sequenza di stelle in funzione della loro colorazione, in questo caso ho optato per un cosiddetto startrail, cioè un'esposizione molto lunga, che mette in evidenza il moto rotatorio della volta celeste sopra le nostre teste. In questo caso la cornice è quella della Valsusa vista dal Colle delle Finestre, con la stella Polare praticamente sullo zenith del Rocciamelone, mentre la valle è coperta da una coltre di nuvole! Anche gli startrail normalmente vedono una serie di stricie bianche, ma per questa ripresa ho appositamente avuto cura che fossero ben evidenti i colori delle singole stelle, scegliendo opportunamente i parametri di scatto. Et voilà, la girandola sul Rocciamelone è servita!

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22 persons like it: Albertopantellini, Alessandro M, Campos_85, Carlmon, Cosmosub, Fabrizios53, Hokusai72, Indaco, Lattu96, Lazzaro, Lucashf, Marzio Bambini, Nemesi9191, Pablo ph, Panzix, Paolo P, Papimoto, Quiksilver, Remo.lanzoni, Sloweyes, Steve 77, Thoro

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Remo.lanzoni

sent on November 05, 2019 (22:56) | This comment has been automatically translated (show/hide original)

At a superficial glance it seemed to me a strartrail as you see so many maybe with the Live Composite technique of Olympus (indeed you used that?). The technical explanation I struggled to understand for my lack of knowledge of what moves in the sky above our heads. What does it mean that you calibrated the shooting parameters to highlight the colors? Thank you and congratulations for your photos that are an incentive to study the sky and squeeze the micro 4/3.

Aleziggio

sent on November 06, 2019 (0:20) | This comment has been automatically translated (show/hide original)

hello Remo :-) exactly, I used the live composite but I took care not to burn the stars to avoid having the white startrails :-)

Cosmosub

sent on November 07, 2019 (17:50) | This comment has been automatically translated (show/hide original)

Show Ale, as always! :-)
The dark areas of the sky are spotless; I know that for the Milky Way this result you get it by keeping the iso low and using the tracker: here how did you do it? :-P

Aleziggio

sent on November 07, 2019 (19:51) | This comment has been automatically translated (show/hide original)

Hello Cosmo :-) I did it the same way: iso 200 and long times et voila 8-)

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