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Contains:  NGC7431, NGC7433, NGC7435, NGC7436
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NGC 7436 Galaxy Group, 


            Gary Imm
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NGC 7436 Galaxy Group

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

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

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

Dates:June 23, 2019June 24, 2019

Astrodon Blue 31mm Gen2 I-Series: 30x120" (gain: 111.00) -12C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 30x120" (gain: 111.00) -12C bin 1x1
Astrodon Lum 31mm Gen2 I-Series: 60x120" (gain: 111.00) -12C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 30x120" (gain: 111.00) -12C bin 1x1

Integration: 5.0 hours

Avg. Moon age: 20.89 days

Avg. Moon phase: 63.15% job: 2993260

RA center: 22h 57' 54"

DEC center: +26° 8' 3"

Pixel scale: 0.494 arcsec/pixel

Orientation: -117.275 degrees

Field radius: 0.194 degrees

Resolution: 2227x1744

Locations: Backyard (Mag 20.8 - New Moon), Onalaska, Texas, United States

Data source: Backyard


This object is a galaxy group located over 300 million light years away in the constellation of Pegasus at a declination of +26 degrees. The image spans 20 arc-minutes in our apparent view, which corresponds to an actual width of almost 2 million light years.

This group is catalogued as Holmberg 800, although a search brings up very little information on the Holmberg catalog. This group is part of the Abell 2513 galaxy cluster.

At the center is the brightest galaxy in the image, the elliptical galaxy NGC 7436. Immediately behind this galaxy is the small spiral galaxy MCG+04-54-005, whose structure is intact and which does not appear to be interacting with 7436. Just above are 3 more NGC galaxies - 7431, 7433, and 7435. Based on the extended star streams, it looks to me as if 7436 and 7435 are interacting. The absence of blue color from these galaxies suggests that star formation is not significant and that any interaction is relatively minor.

The larger galaxy on the right side of the image is UGC 12274. Many other galaxies are also seen in the background. In my opinion, based on their colors and structure, most of these galaxies are just optically aligned and not as close together as they may seem.

This is the first image of this object on Astrobin.



Gary Imm
License: None (All rights reserved)

Sky plot

Sky plot


NGC 7436 Galaxy Group, 


            Gary Imm