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Contains:  NGC 7424
Getting plate-solving status, please wait...
NGC 7424 – Grand Spiral Galaxy, 


            Terry Robison

NGC 7424 – Grand Spiral Galaxy

Technical card

Resolution: 1912x1173

Dates:Nov. 2, 2018

Frames: 113x900"

Integration: 28.2 hours

Avg. Moon age: 24.09 days

Avg. Moon phase: 29.97% job: 2539021

Data source: Own remote observatory

Remote source: Non-commercial independent facility


NGC 7424 – Grand Spiral Galaxy

I thought that I would have another go to see if I could tweak a bit more out of the data. A change in orientation, and an attempt to dig out further details. Thanks for looking

In the constellation Grus, a beautiful face on Grand Design Spiral Galaxy can be found. It is approximately 37.5 to 40 million light years away from us, with an apparent size of 9.5 X 8.1 arcmin. It is worth noting that the structure and diameter are very similar to our own galaxy, the Milky Way.

It takes 100,000 years for light to reach across this galaxy, and it is receding at approximately 930 kilometres per second. The very bright prominent bar in the middle has a slightly more reddish colour suggesting an older population of stars are located along the bar. As you move outwards, the galaxy takes on a bright blue colour with clusters of young and massive stars.

NGC 7424 has a low surface brightness, and best viewed in dark skies. Viewing this incredible object through a small instrument will yield an elliptical haze devoid of the many arms present in the image above. Best viewing of this object is from late September, October, and into November.

Field of View / Plate Solving

Resolution ........ 0.804 arcsec/px
Orientation ....... Up is 92 degrees E of N
Focal ............. 2309.35 mm
Pixel size ........ 9.00 um
Field of view ..... 33' 5.5" x 22' 3.9"
Image centre...... RA: 22 57 18.560 Dec: -41 04 08.38

Exposure Details:

Lum 55X900
Red 20X450
Green 16X450
Blue 26X450
Ha 20X1200

Total time 28.17 hours

Instruments Used:

10 Inch RCOS fl 9.1
Astro Physics AP-900 Mount
SBIG STL 11000m
FLI Filter Wheel
Astrodon Lum, Red, Green, Blue Filters
Baader Planetarium H-alpha 7nm Narrowband-Filter

Software Used

CCDStack (calibration, alignment, data rejection, stacking)
Photoshop CS 6 (Image processing)



Terry Robison
License: None (All rights reserved)


  • NGC 7424 – Grand Spiral Galaxy, 


            Terry Robison
  • Final
    NGC 7424 – Grand Spiral Galaxy, 


            Terry Robison


NGC 7424 – Grand Spiral Galaxy, 


            Terry Robison