M81 LRVB + Halpha (Mathieu Guinot)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: Bode's Galaxy · M 81 · NGC 3031

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M81 LRVB + Halpha

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M81 LRVB + Halpha

La célèbre galaxie de Bode M81 (NGC 3031) est une galaxie spirale située dans la constellation de la Grande Ourse à environ 12 millions d'années-lumière de la Voie lactée et elle est souvent présentée en couple avec sa non moins célèbre voisine M82, lorsque la focale est suffisamment courte.

L'instrument utilisé ici (focale 1600mm) et la taille du capteur de la camera ont en l'occurence permit un plan rapproché sur cette superbe galaxie, à défaut de la présenter avec sa "voisine".

42h d'expositions ont été réalisées en fevrier et mars 2021 pour lui tirer le portrait!

Ce temps de pose conséquent limite le "bruit" dans l'image, et a permis notamment de révéler une multitude de détails (21h filtre de Luminance) et les couleurs de cette galaxie (3h filtres RVB), mais également les nébuleuses (couleur rouge de l'hydrogène ionisé) présentes en son sein (18h d'expositions au travers d'un filtre à Hydrogène), ainsi que de détecter et mettre en valeur le très ténu signal d'IFN ( grands nuages de gaz et de poussière à l'extérieur de notre galaxie et illuminés faiblement par les étoiles de celle-ci, qu'on appelle également cirrus galactiques) dans lequel elle baigne, visible sur l'image sous forme de variations de luminosité du fond de ciel autour de la galaxie.

Acquisitions en plein centre ville d'Amiens (ciel Bortle 7) avec telescope RC8 @f/8 sur monture Avalon Linear et camera ZWO ASI 294mm + filtres LRVB + H Antlia.

L : 248x300s bin2

RVB : 12x300s bin2 chacun

Halpha : 219x300s bin2

Traitement avec Pixinsight et Photoshop.

Backyard

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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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Status	Advanced success
Started	...
Astrometry.net job	4308139
PixInsight job	H3BDNAT216LUUTT17W9S4MEVJ0B587EP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	09h55m43s.866
RA (top/left)	09h58m19s.436
RA (top/right)	09h52m41s.893
RA (bottom/right)	09h53m11s.305
RA (bottom/left)	09h58m43s.540

Dec (center)	+69°04′10″.51
Dec (top/left)	+69°17′11″.40
Dec (top/right)	+69°14′06″.25
Dec (bottom/right)	+68°51′00″.26
Dec (bottom/left)	+68°54′03″.30

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M81 LRVB + Halpha

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M81 LRVB + Halpha

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