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Hemisphere:  Northern  ·  Contains:  NGC 2903  ·  NGC2903  ·  NGC2905
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NGC 2903 – A Barred Spiral Galaxy, 


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NGC 2903 – A Barred Spiral Galaxy

Imaging telescopes or lenses: Planewave CDK24

Imaging cameras: ZWO ASI6200MM Pro

Mounts: Planewave L600

Guiding cameras: Starlight Xpress Ultrastar

Software: Photoshop CS3  ·  PixInsight 1.8  ·  Planewave PWI4  ·  Planewave PWI3  ·  Maxim DL6  ·  Sequence Generator Pro  ·  Adobe Photoshop CC 2014

Filters: Astrodon 50mm B  ·  Astrodon 50mm R  ·  Astrodon 50mm L  ·  Astrodon 50 mm G

Accessory: FLI CFW-5-7  ·  Hedrick Focuser  ·  Planewave Delta-T  ·  Planewave EFA

Dates:Nov. 17, 2020Nov. 18, 2020Nov. 19, 2020

Astrodon 50 mm G: 4x900" (gain: 0.00) -10C bin 1x1
Astrodon 50mm B: 7x900" (gain: 0.00) -10C bin 1x1
Astrodon 50mm L: 12x900" (gain: 0.00) -10C bin 1x1
Astrodon 50mm R: 4x900" (gain: 0.00) -10C bin 1x1

Integration: 6.8 hours

Darks: ~20

Flats: ~80

Flat darks: ~80

Bias: ~20

Avg. Moon age: 3.67 days

Avg. Moon phase: 15.10%

Mean SQM: 21.40

Mean FWHM: 1.80 job: 4030949

RA center: 9h 32' 19"

DEC center: +21° 30' 32"

Pixel scale: 0.195 arcsec/pixel

Orientation: 0.725 degrees

Field radius: 0.246 degrees

Resolution: 6832x5960

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard


A perfect object to start late each evening (2 AM to 5 AM) after capturing Abell 370.

I was able to use the same camera settings with no overexposure. The ASI6200 (Sony IMX455 CMOS) is amazingly configurable with a huge dynamic range when the gain is set to 0.

"NGC 2903 is an isolated barred spiral galaxy in the constellation of Leo. It was discovered by astronomer William Herschel, who cataloged it on November 16, 1784. He mistook it as a double nebula, as did subsequent observers, and it wasn't until the nineteenth century that the Third Earl of Rosse resolved into a spiral form.

NGC 2903 is located about 30 million light-years away, and is a member of the Virgo Supercluster. The morphological classification of this galaxy is SBbc, indicating a barred spiral with moderate to tightly-wound spiral arms.

72% of the stellar mass is located in the outer disk of the galaxy, and 20% is found in the bar. The bulge adds 5% of the stellar mass, and its star population is generally older.

NGC 2903 exhibits an exceptional rate of star formation activity near its center, also bright in radio, infrared, ultraviolet, and x-ray bands. Just a little smaller than our own Milky Way, NGC 2903 is about 80,000 light-years across.

The irregular dwarf galaxy KKH 51 appears to be a companion, as they have an angular separation of 25′ and nearly the same radial velocity."





    NGC 2903 – A Barred Spiral Galaxy, 


  • Final
    NGC 2903 – A Barred Spiral Galaxy, 




Description: Added 1-pixel PS dust removal to smooth some hot pixels.

Sky plot

Sky plot


NGC 2903 – A Barred Spiral Galaxy, 



In these public groups

ASI 6200 MM Pro