Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  Barnard's Galaxy  ·  Barnard's galaxy  ·  NGC 6822  ·  NGC6822
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Barnard's Galaxy (NGC 6822), 



    
        

            KuriousGeorge
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Barnard's Galaxy (NGC 6822)

Getting plate-solving status, please wait...
Barnard's Galaxy (NGC 6822), 



    
        

            KuriousGeorge
Powered byPixInsight

Barnard's Galaxy (NGC 6822)

Imaging telescopes or lenses: Planewave CDK24

Imaging cameras: FLI Proline 16803

Mounts: Planewave L600

Guiding cameras: Starlight Xpress Ultrastar

Focal reducers: None

Software: Planewave PWI4  ·  Planewave PWI3  ·  PixInsight 1.8  ·  Sequence Generator Pro  ·  Photoshop CS3  ·  PHD Guiding 2  ·  CCDWare CCD Inspector  ·  Maxim DL6

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

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


Dates:July 21, 2020July 22, 2020July 23, 2020July 24, 2020

Frames:
Astrodon 50 mm G: 4x900" -30C bin 1x1
Astrodon 50mm B: 4x900" -30C bin 1x1
Astrodon 50mm L: 23x900" -30C bin 1x1
Astrodon 50mm R: 4x900" -30C bin 1x1

Integration: 8.8 hours

Darks: ~20

Flats: ~80

Flat darks: ~80

Bias: ~20

Avg. Moon age: 2.45 days

Avg. Moon phase: 8.09%

Mean SQM: 21.50

Mean FWHM: 2.40


Astrometry.net job: 3696424

RA center: 19h 44' 56"

DEC center: -14° 48' 37"

Pixel scale: 0.234 arcsec/pixel

Orientation: 1.288 degrees

Field radius: 0.351 degrees


Resolution: 7696x7560

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard

Description

Barnard's Galaxy is a barred irregular galaxy approximately 1.6 million light-years away in the constellation Sagittarius. Part of the Local Group of galaxies, it was discovered by E. E. Barnard in 1884 with a six-inch refractor telescope. It's one of the closer galaxies to the Milky Way. It's similar in structure and composition to the Small Magellanic Cloud. It's about 7,000 light-years in diameter.

Edwin Hubble identified 15 variable stars in this galaxy. He also surveyed the galaxy's stars distribution down to magnitude 19.4. He provided spectral characteristics, luminosities and dimensions for the five brightest "diffuse nebulae" (giant H II regions). This included the Bubble and Ring Nebula. He also computed the absolute magnitude of the entire galaxy.

Hubble's detection of eleven Cepheid variable stars was a milestone in astronomy. Utilizing the Cepheid Period-Luminosity relationship, Hubble determined a distance of 698,000 light-years. This was the first system beyond the Magellanic Clouds to have its distance determined.

Hubble's distance to this galaxy was way beyond Harlow Shapley's value of 300,000 light-years for the size of universe. In the paper, Hubble concluded the "Great Debate" of 1920 between Heber Curtis and Shapley over the scale of the universe and the nature of the "spiral nebula". It soon became evident that all spiral nebulae were in fact spiral galaxies far outside our own Milky Way.

In 1977, Paul W. Hodge extended the list of known H II regions in Barnard to 16. Today, there are over 150 of these regions catalogued in Barnard's Galaxy.

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