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FROM THE OBSERVATORY · 10-Aug-2021

The Bubble Galaxy

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The Bubble Galaxy
NGC 3521 is a flocculent spiral galaxy located 26 million light-years away from Earth
BEHIND THE IMAGE

Notes from the session

Image:
72x 300s Luminance
16x 300s Red
15x 300s Green
17x 300s Blue


Total integration 10 hours. Focal length: 1960mm

Hardware:
Celestron 11" EdgeHD
Celestron 0.7x EdgeHD focal reducer
Skywatcher EQ8-Rh Pro mount
QSI 683-ws8 Camera @ -15°C
Astrodon LRGB Gen2 E-Series Tru-Balance filters
Starlight Xpress Lodestar X2 Autoguider
Innovations Foresight ONAG
Starlight Instruments Feather Touch Focuser



Location:
Exposed over 4 nights between 24th March to 10th April 2021
Orange zone in Brisbane, Australia. (Bortle 7)



Software:
Planning & camera alignment with Aladin 10
Captured with TheSkyX Professional
Guiding with PHD2
PixInsight: Calibrate, align, integrate, dynamic background extraction, LRGB combination, noise reduction, photometric color calibration, HDR multiscale transform, histogram, curves, crop.