NGC 3521 - The Bubble Galaxy

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Location / Date

Zellerndorf, March 2017

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne-Corrector (focal length 910 mm)
ASA DDM60, no Guiding

Camera / Exposure

FLI ML8300 with Astrodon filters

L 70 x 10min, R 18 x 10min, G 12 x 10min, B 12 x 10min

Total exposure time: 18h 40min


PixInsight, Fitswork, Photoshop


NGC 3521, also known as Bubble Galaxy, is located about 35 Million light-years away in the constellation Leo. The galaxy has patchy, irregular spiral arms with dust, pink star forming regions and clusters of young blue stars.

An interesting aspect of NGC 3521 is the bubble-like apparition that surrounds the core. This shells are likely tidal debris, streams of stars torn from satellite galaxies that have undergone mergers with NGC 3521 in the distant past.

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