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Imaging telescopes or lenses: Takahashi TSA 102
Imaging cameras: Atik ONE 6.0
Mounts: Skywatcher AZ EQ6 GT
Guiding telescopes or lenses: Takahashi TSA 102
Guiding cameras: Atik GP
Focal reducers: Takahashi TOA-RD
Software: Pleiades Astrophoto PixInsight 1.8 Ripley · Photoshop · PHD Guiding 2 · Atik Artemis
Filters: Astronomik B 1.25" · Astronomik G 1.25" · Astronomik R 1.25" · Astronomik L 1.25"
Accessory: Atik OAG
Dates:Aug. 21, 2018
Frames:
Astronomik B 1.25": 20x60" -10C bin 2x2
Astronomik G 1.25": 20x60" -10C bin 2x2
Astronomik L 1.25": 10x120" -10C bin 1x1
Astronomik L 1.25": 20x60" -10C bin 1x1
Astronomik L 1.25": 10x300" -10C bin 2x2
Astronomik R 1.25": 20x60" -10C bin 2x2
Integration: 2.5 hours
Darks: ~64
Flats: ~12
Bias: ~101
Avg. Moon age: 10.29 days
Avg. Moon phase: 78.96%
Bortle Dark-Sky Scale: 5.00
Astrometry.net job: 2235344
RA center: 3h 30' 16"
DEC center: +61° 0' 37"
Pixel scale: 1.528 arcsec/pixel
Orientation: -125.345 degrees
Field radius: 0.777 degrees
Resolution: 2660x2516
Locations: Fouras, Fouras, Charente-Maritime, France
Data source: Backyard
La comète 21P Giacobini-Zinner, photographiée le 21 août 2018 avec une caméra CCD monochrome en LRGB.
Un des traitements les plus compliqués que j'ai eu à faire jusqu'ici ; la comète se déplaçait très rapidement (bougé visible en 120s avec 600mm de focale à 1,5" d'échantillonnage) ce qui a rendu très difficile l'empilage des images.
2 séries de 10 poses par filtres LRGB en 60s, en bin1 pour la Luminance et bin 2 pour la couleur.
1 série de 10 poses de 120s bin 1 en L.
1 série de 10 poses de 300s bin 2 en L.
Empilage pour chaque série de 2 images, l'une sur les étoiles, l'autre sur la comète (avec Pixinsight).
Assemblage final sous Photoshop.
La position de la comète sur l'image correspond au 21 août 2018 à 4h08 (heure de l'image de référence pour l'empilage des images). La comète se situait alors à 0,45 UA (68 millions de km) de la Terre.
J'espère que ce souvenir de cette belle visiteuse vous plaira ! :)
En bonus : : time lapse réalisé avec les images du 21 août .
jb
------------------------------------------------------
Comet 21P Giacobini-Zinner, on 21st august 2018 with monochrome CCD in LRGB.
One of the most challenging image processing for me ; the comet moved very quickly in the sky (move visible with 120s image at 600mm focal and 1'5"/px) that involved a hard work for stacking.
2 series of 10 images x 60s for each filters (LRGB), bin1 for Luminance, bin2 for RGB.
1 serie of 10 images x 120s bin 1 for L.
1 serie of 10 images x 300s bin 2 for L
2 stacks for each serie : one on stars, the other one on the comet (with Pixinsight)
Final mix with Photoshop
The position of the comet on this image is the one at 21st august 2018, 4h08am (the one of the reference image for stacking). The comet was then distant of 0,45 AU (0,68 million km) from Earth
Hope you will like this little souvenir of this beautiful visitor ! :)
Bonus : a time-lapse of the comet .
jb
Description: Noyau de la comète (traitement par gradient rotationnel) Core of the comet (rotational gradient processing)
Description: Image finale avec en incrustation le noyau de la comète.
AAA : Astronomes et Astrographes Amateurs |
Comets Imaging |
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