Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  Cigar Galaxy  ·  M 81  ·  M 82  ·  NGC 2959  ·  NGC 2961  ·  NGC 2976  ·  NGC 3031  ·  NGC 3034  ·  NGC 3077  ·  PGC 139216  ·  PGC 166101  ·  PGC 213630  ·  PGC 213665  ·  PGC 2695187  ·  PGC 2695886  ·  PGC 2696068  ·  PGC 2696626  ·  PGC 2696807  ·  PGC 2696913  ·  PGC 2697716  ·  PGC 2697954  ·  PGC 2698001  ·  PGC 2698994  ·  PGC 2699488  ·  PGC 2699523  ·  PGC 2700740  ·  PGC 2701200  ·  PGC 2702200  ·  PGC 2703724  ·  And 148 more.
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Bode's, Cigar, Garland, NGC2976 Galaxies, JDAstroPhoto
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Bode's, Cigar, Garland, NGC2976 Galaxies

Getting plate-solving status, please wait...
Bode's, Cigar, Garland, NGC2976 Galaxies, JDAstroPhoto
Powered byPixInsight

Bode's, Cigar, Garland, NGC2976 Galaxies

Equipment

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Acquisition details

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Description

This is extraordinary, these four galaxies (Bode's, Cigar, Garland, NGC2976 Galaxies) all in Ursa Major (very close to the spoon of the Big Dipper) all doing a never ending dance around the North Star. These galaxies are Circumpolar (never set) and are from 12 degrees to 54 degrees above the horizon, depending on the time of year, and time of night.  What's even more intriguing is that all four of these galaxies are around the same distance from Earth, 12 million light years; therefore the light you are seeing is 12 million years old.  In addition, because of their close proximity to each other gravitational interaction between the galaxies is evident.

Bode's Galaxy (M81) (center in image) is a beautiful Grand Design Spiral Galaxy which contains a super massive Black Hole which is the equivalent of 70 million solar masses, i.e. the equivalent mass of 70 million of our Suns.  Its elegant spiral arms display the Nebula's within the galaxy with the colors revealing the gas types.  The blueish colors are Oxygen, while the reddish are Sulfur and Hydrogen.


To the right of the Bode's Galaxy is the Cigar galaxy (M82).  Because of its proximity to Bode's Galaxy, gravitational interactions between the two galaxies are causing it to have a high rate of star formation.  Estimates that star formation is 10 times faster than inside our own Milky Way.  This formation is self propagating, more stars create more galactic wind, which compresses more gas to make more stars.  It is also self-limiting, eventually all the material to make more stars will be consumed.  The extremely bright core of the Cigar Galaxy will eventually subside in 20 million years or so.  What is also evident is the huge amount of Hydrogen and Sulfur Gas (reddish color) surrounding the core of the Cigar Galaxy.  


The Garland Galaxy (NGC 3077) is to the left of Bode's Galaxy.  It is a smaller elliptical galaxy which is classified as disrupted probably because of the gravitational interaction from Bode's and Cigar Galaxies.  It is speculated that the wispy edges and scattered dust clouds are the result of these interactions.

At the bottom of the image we have NGC 2976 Galaxy.  It is classified as a Peculiar Dwarf Galaxy.  The inner structure reveals dark lanes of dust and reddish (Hydrogen) regions to the left and right.  This galaxy exhibits a steady decline in star formation rate over the last billion years and its population of stars is now dominated by older stars.    

This is why the Bode's Galaxy cluster is so extraordinary.  Its close proximity to earth, and each other, forms the basis of these gravitational interactions which influence the shape and star formation of the galaxies.

Acquisition:
I captured this astronomical data using wide band (visible light) Red, Green, Blue and Luminance filters over 4 nights, 8/28/2022, 8/30/2022, 10/24/2022 and 10/27/2022 at my Astronomy Club's dark sky property, San Diego Astronomy Association (SDAA) at Tierra Del Sol, Bortle 3 location.  I camped there overnight. Broad band images (full spectrum, RGB) of Galaxies are best acquired at a dark sky, otherwise the images will be swamped by light pollution and detail will be lacking.  
61 Exposures 10 minutes each, unguided, Luminance = 10 hours 10 min
28 Exposures 10 minutes each, unguided, Red = 4 hour 40 min
24 Exposures 10 minutes each, unguided, Green = 4 hours 0 min
23 Exposures 10 minutes each, unguided, Blue = 3 hours 50 min
Total Exposure = 22 hours 40 min


The color in this image was calibrated with the Gaia Spacecraft spectrophotometric measurements to ensure the colors you are seeing are representative of the true spectral properties of the galaxies and stars.  Therefore it is accurate to conclude, the blue stars are typically hotter and brighter, the red stars cooler and bigger.  Blue colors in galaxies are Nebulas rich in Oxygen; Reddish, Sulfur and Hydrogen.  
As you probably surmised based on my acquisition timelines versus publishing, this image was very difficult to get "right".  I've had many iterations of this image that were "wrong" and I was not going to publish.  Getting these images correctly color balanced is as important as acquiring the image itself, otherwise you could not make correct conclusions on the gasses and formations.  These galaxies are very special and therefore required my utmost care in representing them correctly.

I've added a plate solving algorithm from PixInsight which overlays the image and identifies the objects in the Star Catalogs.  
The image is 60 million pixels (9576x6388). All the details are in the full resolution image so ensure that you get to see the galaxies at full resolution.    

Click on the image, Top right click on full resolution, After it loads, top right, click on "Fit to Window".  
For the galaxy hunters, all the NGC PGC objects identified in this image are galaxies, NGC 2959 and NGC 2961 in particular.  Hover your cursor over one of the catalog objects and click on the object and the full resolution image will come up, you will be able to identify the galaxies.

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Bode's, Cigar, Garland, NGC2976 Galaxies, JDAstroPhoto

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