Hemisphere:  Southern  ·  Constellation: Cetus (Cet)  ·  Contains:  NGC 309
Getting plate-solving status, please wait...
NGC 309, 



    
        

            Gary Imm
NGC 309, 



    
        

            Gary Imm

NGC 309

Getting plate-solving status, please wait...
NGC 309, 



    
        

            Gary Imm
NGC 309, 



    
        

            Gary Imm

NGC 309

Imaging Telescopes Or Lenses
Celestron EdgeHD 11
Imaging Cameras
ZWO ASI 294 MM Pro
Mounts
Astro-Physics Mach1GTO
Filters
Astrodon Green 31mm Gen2 I-Series · Astrodon Blue 31mm Gen2 I-Series · Astrodon Lum 31mm Gen2 I-Series · Astrodon Red 31mm Gen2 I-Series
Accessories
Celestron OAG · ZWO EFW 2″X7 · MoonLite Focuser for EdgeHD 11
Software
Adobe Inc Lightroom Classic · Pleaides Astrophoto PinInsight 1.8 · Main Sequence Software Sequence Generator Pro · Adobe Inc Adobe Photoshop CC 2021 · Stark Labs PHD2 2.6.3
Guiding Cameras
ZWO ASI 174 MM Mini

Acquisition details

Dates:
Nov. 1, 2021 ·  Nov. 2, 2021
Frames:
Astrodon Blue 31mm Gen2 I-Series: 30x120" (1h) (gain: 120.00) -10C bin 2x2
Astrodon Green 31mm Gen2 I-Series: 30x120" (1h) (gain: 120.00) -10C bin 2x2
Astrodon Lum 31mm Gen2 I-Series: 60x120" (2h) (gain: 120.00) -10C bin 2x2
Astrodon Red 31mm Gen2 I-Series: 30x120" (1h) (gain: 120.00) -10C bin 2x2
Integration:
5h
Avg. Moon age:
26.30 days
Avg. Moon phase:
11.63%

RA center: 00h56m42s.620

DEC center: -09°5451.10

Pixel scale: 0.343 arcsec/pixel

Orientation: -0.073 degrees

Field radius: 0.163 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 2686x2126

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

Data source: Backyard

Description

This Astrobin Debut Object is one of the largest and most luminous grand spiral galaxies in the known universe.  It is a near face-on barred spiral galaxy located 260 million light years away in the constellation of Cetus at a declination of -10 degrees.  This magnitude 12 galaxy spans 2.6 arc-minutes in our apparent view, which corresponds to a huge diameter of over 200,000 light years.  I calculate our viewing angle to be about 30 degrees from face-on.

I find the disk of this galaxy to be fascinating.  This is one of those puzzling, crazy multi-arm chaotic disk structures which I have seen with several galaxies.  The most intriguing aspect of this structure, aside from trying to count the number of arms, is that no close companions have been identified as the cause of the disturbance.  The small spiral galaxy seen at the bottom of NGC 309 is much further away, at 0.75 billion light years.

Blue star clouds are visible in the arms, which are well defined but hard to trace in a definitive pattern.  Several straight VV rows are seen in the arms.  A pseudo-ring has formed around the yellow barred core.

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