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Contains:  NGC 3521
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NGC 3521, The Bubble Galaxy

Technical card

Imaging telescopes or lenses:AG Optical 12.5" iHW

Imaging cameras:QHYCCD QHY600

Mounts:iOptron CEM120 EC2

Guiding telescopes or lenses:AG Optical 12.5" iHW

Guiding cameras:ZWO ASI290MC

Filters:Astrodon Ha 50mm 5nmAstronomik LRGB IIc lrgb

Dates:April 21, 2020April 25, 2020May 12, 2020May 21, 2020May 22, 2020May 23, 2020

Astrodon Ha 50mm 5nm: 26x600" (gain: 26.00) -10C bin 1x1
Astronomik LRGB IIc lrgb: 120x300" (gain: 26.00) -10C bin 1x1
Astronomik LRGB IIc lrgb: 91x300" (gain: 26.00) -15C bin 1x1

Integration: 21.9 hours

Avg. Moon age: 18.14 days

Avg. Moon phase: 13.37%

Bortle Dark-Sky Scale: 2.00

Mean FWHM: 2.25

Temperature: 14.17

Basic astrometry details job: 3570792

RA center: 11h 5' 47"

DEC center: -0° 1' 48"

Pixel scale: 1.264 arcsec/pixel

Orientation: 271.928 degrees

Field radius: 0.509 degrees

Resolution: 2330x1722

Locations: Cielmonchili, Monte Patria, Coquimbo, Chile

Data source: Own remote observatory

Remote source: Non-commercial independent facility


NGC 3521 - The so-called "Bubble galaxy" is a spiral galaxy about 50,000 light years in diameter, located just 26.2 million light years from Earth in the constellation Leo (Leo), while that it moves away from us at about 801 kilometers per second. .

The galaxy has a morphological classification of SAB (rs) bc, which indicates that it is a spiral galaxy with a trace of bar structure (SAB), a weak internal ring (rs) and an arm structure. . moderately to weakly wound (bc).

The multiple spiral arms of the NGC 3521 are somewhat uneven and irregular, making it a so-called flocculent spiral galaxy. These galaxies have discontinuous "fluffy" spiral arms that differ from the well-defined arms of large-design spiral galaxies. About 30 percent of all spiral galaxies discovered to date are flocculent.

The image reveals evidence of one or more previous fusions with dwarf galaxies that left discernible substructures, like an almost spherical cloud of debris visible almost all around. This represents shells of debris belonging to an umbrella-like structure.



Patrick Dufour
License: None (All rights reserved)



Description: framing on the Galaxy

Sky plot

Sky plot


NGC 3521, The Bubble Galaxy, 


            Patrick Dufour

In these public groups

Astroimaging from Chile