Tout près de Phad… (Corine Yahia (RIGEL33))

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 109 · NGC 3953 · NGC 3992 · Phecda (γUMa) · The star Phad

Tout près de Phad…, Corine Yahia (RIGEL33)

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Tout près de Phad…

Link to TIFF/FITS: https://flic.kr/p/Hf8vLC

Le 5 mai 2016, les Nuits astronomiques de Touraine étaient commencées et nous pouvions toujours profiter du ciel noir de Tauxigny (37). Pour cette seconde cible au foyer de mon 150/750, j'avais choisi M109, une galaxie spirale barrée. L'objet semblait bien petit pour mon champ… il me fallait lui trouver des compagnons. Ce fut le cas avec une autre galaxie spirale, NGC 3953 et l'étoile de la Grande Ourse : Phad, située dans la cuisse du plantigrade céleste.

Dans l'image, M109 (NGC 3992) est en haut à droite et NGC 3953 en bas à gauche. On peut voir en haut à gauche du centre une autre spirale cataloguée PGC 37735, et une autre encore en bas à gauche de M109 : PGC 37553. Si on est attentif, on en voit d'autres sous forme de tachouilles floues.

Je suis satisfaite de mon cadrage mais j'ai eu un mal fou à traiter l'image afin que Phad n'envahisse pas tout le champ de son halo teintée de bleue… il faut dire que j'ai dû sacrifier la moitié de mes poses car ce vilain halo, sûrement dû à la buée sur mon secondaire, est apparue au cours de la prise de vue et je ne m'en suis rendue compte qu'au moment du tri. Je pense avoir trouvé un bon compromis même si Phad reste omniprésente.

Photo prise le 5 mai 2016 à Tauxigny (37) – Canon 350D non-défiltré (avec correcteur de coma) au foyer d'un Newton 150/750 sur monture Orion Sirius EQ-G motorisé (sans autoguidage ni goto).

55 poses de 2 mn – 15 DOF – ISO 800 – IRIS et Toshop.

AAA : Astronomes et Astrographes Amateurs

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