Hemisphere:  Northern  ·  Contains:  IC1907  ·  NGC 1267  ·  NGC 1268  ·  NGC 1270  ·  NGC 1271  ·  NGC 1272  ·  NGC 1273  ·  NGC 1274  ·  NGC 1275  ·  NGC 1277  ·  NGC 1278  ·  NGC 1281  ·  NGC 1282  ·  NGC 1283  ·  NGC1267  ·  NGC1268  ·  NGC1270  ·  NGC1271  ·  NGC1272  ·  NGC1273  ·  NGC1274  ·  NGC1275  ·  NGC1276  ·  NGC1277  ·  NGC1278  ·  NGC1279  ·  NGC1281  ·  NGC1282  ·  NGC1283  ·  Perseus A
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The Perseus Cluster of Galaxies, 


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The Perseus Cluster of Galaxies

Imaging telescopes or lenses: Planewave CDK24

Imaging cameras: FLI Proline 16803

Mounts: Planewave L600

Guiding cameras: Starlight Xpress Ultrastar

Focal reducers: None

Software: PixInsight 1.8  ·  Sequence Generator Pro  ·  Photoshop CS3  ·  PHD Guiding 2  ·  CCDWare CCD Inspector  ·  Planewave PWI4  ·  Planewave PWI3  ·  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:Nov. 11, 2020Nov. 12, 2020Nov. 13, 2020

Astrodon 50 mm G: 12x900" -30C bin 1x1
Astrodon 50mm B: 12x900" -30C bin 1x1
Astrodon 50mm L: 24x900" -30C bin 1x1
Astrodon 50mm R: 12x900" -30C bin 1x1

Integration: 15.0 hours

Darks: ~20

Flats: ~80

Flat darks: ~80

Bias: ~20

Avg. Moon age: 26.38 days

Avg. Moon phase: 11.55%

Mean SQM: 21.40

Mean FWHM: 1.60

Astrometry.net job: 4015560

RA center: 3h 19' 32"

DEC center: +41° 28' 0"

Pixel scale: 0.234 arcsec/pixel

Orientation: -179.502 degrees

Field radius: 0.363 degrees

Resolution: 7912x7896

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard


We had a very heavy rain on November 8th with 60 mph winds. This finally cleared into an unusually transparent and steady sky. FWHM on the 15-minute Luminance subs was between 1.4" and 2.1". Perfect conditions for shooting tiny distant galaxies. (-:

"The Perseus cluster (Abell 426) is a cluster of galaxies in the constellation Perseus. It is one of the most massive objects in the known universe, containing thousands of galaxies immersed in a vast cloud of multimillion-degree gas.

In 2003 a team of astronomers led by Dr. Andrew Fabian at Cambridge University discovered one of the deepest notes ever detected. No human will actually hear the note, because its time period between oscillations is 9.6 million years, which is 57 octaves below the keys in the middle of a piano. The sound waves appear to be generated by the inflation of bubbles of relativistic plasma by the central active galactic nucleus in NGC 1275.

NGC 1275 has also been forming thousands of new globular clusters over the last billion years out of a cool gas.

This network of cool gas precipitates from the hot gas that infuses the entire Perseus galaxy cluster. In fact, the gas concentrates in the center allowing it to cool faster and that leads to the creation of globular clusters.

Once formed, these infant globular clusters do not remain in the network of cool gas but rain inwards onto the giant galaxy like raindrops falling from the clouds."





    The Perseus Cluster of Galaxies, 


  • Final
    The Perseus Cluster of Galaxies, 




Description: Slight less HDR for smoother gradients on elliptical galaxies.

Sky plot

Sky plot


The Perseus Cluster of Galaxies, 



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Unique or Unusal Deep Sky Targets