Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  IC 2725, NGC 3628
Getting plate-solving status, please wait...
NGC3628 The Hamburger Galaxy, 


NGC3628 The Hamburger Galaxy
Powered byPixInsight

NGC3628 The Hamburger Galaxy

Technical card

Dates:March 25, 2020March 28, 2020April 1, 2020April 10, 2020April 12, 2020April 14, 2020

Astronomik B 1.25" Type IIc: 20x600" -10C bin 1x1
Astronomik G 1.25" Type IIc: 17x600" -10C bin 1x1
Astronomik L 1.25" Type IIc: 57x600" -10C bin 1x1
Astronomik R 1.25" Type IIc: 20x600" -10C bin 1x1

Integration: 19.0 hours

Darks: ~30

Flats: ~30

Bias: ~100

Avg. Moon age: 11.84 days

Avg. Moon phase: 48.00%

Basic astrometry details job: 3413106

RA center: 11h 20' 16"

DEC center: +13° 34' 58"

Pixel scale: 0.508 arcsec/pixel

Orientation: 178.920 degrees

Field radius: 0.286 degrees

Resolution: 3244x2429

Locations: Lighthouse Observatory, Burleson, Texas, United States

Data source: Backyard


NGC 3628, also known as the Hamburger Galaxy or Sarah's Galaxy, is an unbarred spiral galaxy about 35 million light-years away in the constellation Leo. It was discovered by William Herschel in 1784. It has an approximately 300,000 light-years long tidal tail. Along with M65 and M66, NGC 3628 forms the Leo Triplet, a small group of galaxies. Its most conspicuous feature is the broad and obscuring band of dust located along the outer edge of its spiral arms, effectively transecting the galaxy to the view from Earth.
Due to the presence of an x-shaped bulge, visible in multiple wavelengths, it has been argued that NGC 3628 is instead a barred spiral galaxy with the bar seen end-on. Simulations have shown that bars often form in disk galaxies during interactions and mergers, and NGC 3628 is known to be interacting with its two large neighbors. [Source: Wikipedia]

CAPTURE Information:
The image was captured with the iOptron CEM120 mount , the venerable Meade 12"LX200 SCT, and my Atik 383L+ mono CCD at F7.16 (2182mm FL). Image subs were taken through Astronomik's filter Lum, along with R, G and B. All subs were done at 1x1 bin, -10C, at 10 minutes each.
IMAGE information -- 2020
Lum: 57 subs (9.5hr) on Apr 1st, 10th, 12th and 13th.
Red: 20 subs (3.33hr) on Mar 25th.
Green: 17 subs (2.83hr) on Mar 25th and 28th.
Blue: 20 subs (3.33hr) on Mar 25th.

Processing was done with PixInsight, following (for the most part) kayronjm's tutorial of Feb. 24th from several years back. Only L was used to develop the Luminance image. R, G and B were collected for the color mix.
As with the previous M109 image, I put the “Game” mask to good use. This tool allows you to create an image mask featuring an elliptical mask of any size and orientation. In the case of M109, I used multiple ellipsies in one image to cover its various galaxies. Nothing has been said by the creator of PixInsight, but I suspect this approach violates his coda of never “painting”. However, it’s one hell of a handy tool.
North is to the right (pretty sure), and this is a slight crop due to the various movement of different subs.
This is my second run at NGC3628. The first time was in 2011 using my Canon Xsi (modded) DSLR. This image is much better.
a) There had been a problematic remnant of an airplane streak just under the galaxy in a mostly horizontal orientation. 9.5hr of luminance subs finally removed this feature.
b) There is a very bright star just a bit outside of the upper left corner. Unfortunately, it cast substantial reflection into the field of view. A keen eye can see where I used the PixInsight Clone Stamp tool to eliminate this feature.

Fairly satisfied with the results, although there was little noticeable difference between the 3.33hr luminance and 9.50hr luminance.



License: None (All rights reserved)

Sky plot

Sky plot


NGC3628 The Hamburger Galaxy,