Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  NGC 189  ·  NGC189
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NGC 189, 



    
        

            Gary Imm
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NGC 189

Getting plate-solving status, please wait...
NGC 189, 



    
        

            Gary Imm
Powered byPixInsight

NGC 189

Imaging telescopes or lenses: Takahashi TOA-130NFB

Imaging cameras: ZWO ASI 183MM Pro Cool

Mounts: Astro-Physics Mach1GTO

Guiding telescopes or lenses: Orion 60mm Guidescope

Guiding cameras: Orion StarShoot AutoGuider Pro Mono

Software: Main Sequence Software Sequence Generator Pro  ·  PixInsight  ·  Stark Labs PHD2 2.6.3

Filters: Astrodon Green 31mm Gen2 I-Series  ·  Astrodon Blue 31mm Gen2 I-Series  ·  Astrodon Red 31mm Gen2 I-Series

Accessory: ZWO EFW  ·  Takahashi Flattener TOA-67  ·  Feathertouch Focuser Boss II Electronic Focusing Control


Dates:Oct. 25, 2019

Frames:
Astrodon Blue 31mm Gen2 I-Series: 20x120" (40') (gain: 111.00) -15C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 20x120" (40') (gain: 111.00) -15C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 20x120" (40') (gain: 111.00) -15C bin 1x1

Integration: 2h

Avg. Moon age: 26.50 days

Avg. Moon phase: 10.04%


Astrometry.net job: 3024693

RA center: 0h 39' 21"

DEC center: +61° 5' 34"

Pixel scale: 0.494 arcsec/pixel

Orientation: 89.345 degrees

Field radius: 0.283 degrees


Resolution: 3241x2551

Locations: Backyard (Mag 20.8 - Bortle 4.5), Onalaska, Texas, United States

Data source: Backyard

Description

This object is a small open star cluster located 2400 light years away in the constellation of Cassiopeia at a declination of +61 degrees. The 8.8 magnitude cluster of 40 stars spans only 5 arc-minutes in our apparent view, which corresponds to a diameter of 4 light years. That diameter is the smallest I can recall for an open cluster.

This is a pleasant little cluster with a variety of colors and sizes, making it easy to come up with different shapes which fit its interesting pattern. The cluster does not stand out well from the background at first, but with time the eye adjusts and it is fairly easy to pick out the cluster stars.

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