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#676 Organic Astrochemist

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Posted 13 August 2022 - 04:10 PM

As an example, I was intrigued this year by the differences I was able to observe between M10 and M12 when I really concentrated on comparing them. This under dark skies with the 114 mm Starblast f/4 at 112X or 188X.
As your data and that of others show the two clusters have similar apparent and absolute magnitudes (M10 is slightly brighter), very similar distances, and M10 has only a slightly larger radius. However, I had the distinct impression of resolving many more stars in M10 (a larger instrument or camera would have resolved more in both). This observation seems consistent with the data that suggests that M10 is twice as massive as M12 and therefore has many more stars on the RGB spread out over a slightly larger area that allowed me to see them fleetingly.
https://people.smp.u...ts/ngc6254.html

https://people.smp.u...ts/ngc6218.html

It’s unfortunate that your observations of these two clusters were done with very different equipment. Perhaps you will revisit them some day.

Edited by Organic Astrochemist, 13 August 2022 - 04:13 PM.

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#677 AllanDystrup

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Posted 15 August 2022 - 01:44 AM

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WOW OA, -- Talking about learning a lot!

 

     I thank you for a very interesting analysis and perspective on the GC classification system!

 

     Personally (and like you), I've never been a fan of the SS concentration-class classification of the GCs, being purely morphological as seen from our local perspective of the solar system; In that way it is like the "Gould's Belt" description of the OB-associations: it is lacking crucial parameters of object mass, chemical composition and 4D kinematics, and thus missing out on the most interesting aspect of origin and evolution of these objects.

 

     Luckily today, with the ESO GAIA data, we DO have approximations for these parameters, and thus a much better foundation for building our understanding of the astrophysics of Globular Clusters.

 

     Also, thank you for the link to the website with "Fundamental parameters of Galactic globular clusters" (by Baumgardt et. al.) -- a comprehensive, very useful aggregation of up-to date GC-data, including kinematics, CMD, mass and rotation graphs. I'll be using that a lot as a central reference in the future! As you suggest, this updated knowledge of mass and CMD-data (RGB members) will allow a more well founded interpretation of what we can observe here from earth with our humble amateur equipment.

 

Thanks again OA, always a pleasure and inspiration reading your analysis and comments on these projects!
   
     -- Allan


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#678 AllanDystrup

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Posted 04 August 2023 - 01:57 AM

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Messier Galaxies

 

     A good 2yr ago I initiated a "DSO reboot" project (see: https://www.cloudyni...eld/?p=11099743) with the aim of "zooming in on the morphology and astrophysics of selected Messier objects in a cosmological evolutionary order, starting with nebulae (molecular clouds with emission or reflection nebulosity), then on to young open clusters and evolved older open clusters, then remnants of dying stars (supernovae and planetary nebulae), all in our own Milky Way, and finally moving on to selected Messier global clusters and other small galaxies surrounding our Milky Way."

     

     After one year, I had covered all the Messier objects in our own Milky Way galaxy (accessible from my 56dg N latitude), after which I took a break to concentrate more on solar system objects.

     

     Now, a year later, I would like to close the DSO reboot project with a run through the remaining class of Messier objects: the other galaxies. Naturally, I'll start with the Local Group of galaxies in the immediate vicinity of our Milky Way, and then move out through the Local Supercluster to the distant galaxies in the Virgo Supercluster.

     

     

CMO GXY 00.png

***click***

     -- Allan


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#679 AllanDystrup

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Posted 05 August 2023 - 02:33 AM

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CMO GXY 01.png

 

     -- Allan


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#680 AllanDystrup

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Posted 05 August 2023 - 02:47 AM

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     Our Local Group of galaxies is prominent on the night sky at this time of year (late summer, early autumn) where it is seen roughly along R.A 0h-1h, stretching from Cassiopeia up north, down through Andromeda-Pegasus and further down through Pisces-Cetus, way down south towards the Sculptor Group:

 

CMO GXY 02s.jpg

 

     -- Allan


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#681 AllanDystrup

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Posted 05 August 2023 - 03:48 AM

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CMO GXY 03s.jpg

***click***

     -- Allan


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#682 AllanDystrup

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Posted 05 August 2023 - 03:49 AM

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CMO GXY 03B.png

***click***

     -- Allan


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#683 AllanDystrup

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Posted 06 August 2023 - 03:22 AM

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M33, - the Triangulum galaxy

     

CMO GXY 04.png

***click***

     -- Allan


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#684 AllanDystrup

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Posted 06 August 2023 - 03:26 AM

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CMO GXY 05s.jpg

***click***

 

     Here's a link to a PDF document with my observations of the Messier galaxies in our local group:

https://qualitycode....local-group.pdf

 

     -- Allan

 



#685 AllanDystrup

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Posted 08 August 2023 - 01:40 AM

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Step 2:   6 Mpc ~ 20 Mly
The Local Supercluster

     

     

CMO GXY LSC Near 00.png

CMO GXY LSC Near 01.png

***click***

     -- Allan


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#686 AllanDystrup

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Posted 08 August 2023 - 01:44 AM

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Local Supercluster, Near : M81 Group

     

     CMO GXY LSC Near 02.png

***click***

     -- Allan


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#687 AllanDystrup

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Posted 09 August 2023 - 08:52 AM

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CMO GXY LSC Near 03.png

***click***

     -- Allan


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#688 AllanDystrup

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Posted 09 August 2023 - 08:53 AM

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CMO GXY LSC Near 04.png

***click***

     -- Allan

 


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#689 AllanDystrup

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Posted 09 August 2023 - 08:54 AM

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CMO GXY LSC Near 05.png

***click***     

     -- Allan


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#690 AllanDystrup

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Posted 10 August 2023 - 02:17 AM

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Local Supercluster, Near : CVn-I Galaxy Group

     

     

CMO GXY LSC Near 06.png

CMO GXY LSC Near 07.png

***click***

 

     -- Allan


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#691 AllanDystrup

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Posted 11 August 2023 - 01:20 AM

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Local Supercluster, Near : M83 / Centaurus-A galaxy assembly

     

      M83 is the southernmost (-30dg dec.) of the close-by M-objects in the "Spring Milky Way of Galaxies"; It is a bright barred spiral galaxy easily visible from southern latitudes, already naked eye and in binos, and it should be a splendid showpiece for small telescopes; 

     

     Messier himself, however, stated  that from Paris (~49dg lat.) he could only glimpse it "with the greatest concentration", through his largest telescopes, and from Copenhagen (Denmark) at 56N latitude, M83 is indeed a hard object to spot, as it culminates at only around 4dg altitude.

 

 

CMO GXY LSC Near 08.jpg

***click***

     -- Allan


Edited by AllanDystrup, 11 August 2023 - 01:22 AM.

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#692 AllanDystrup

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Posted 11 August 2023 - 01:35 AM

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CMO GXY LSC Near 09.png

***click***

 

 

Here's a link to a PDF with my observations of the M-galaxies

in the "near" foreground of the Spring Milky Way of Galaxies:

 

https://qualitycode....luster-near.pdf

     -- Allan


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#693 AllanDystrup

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Posted 12 August 2023 - 03:07 AM

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Local Supercluster, Far: M101 Galaxy Group

 

     Moving on now, to the more distant (~30 Mly) M-galaxies of the Local Supercluster, starting with the M101 Galaxy Group:

     

     

CMO GXY LSC Far 00.png

***click***

     -- Allan


Edited by AllanDystrup, 12 August 2023 - 03:12 AM.


#694 AllanDystrup

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Posted 12 August 2023 - 03:11 AM

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M101: The Pinwheel Galaxy

     

     

CMO GXY LSC Far 01.png

***click***

     -- Allan


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#695 AllanDystrup

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Posted 12 August 2023 - 03:12 AM

.

 

CMO GXY LSC Far 02.png

***click***

     -- Allan



#696 AllanDystrup

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Posted 13 August 2023 - 12:38 AM

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The M101 Galaxy Group -- M51 Subgroup

M51: The Whirlpool Galaxy

     

     

CMO GXY LSC Far 03.png

***click***

     -- Allan


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#697 AllanDystrup

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Posted 14 August 2023 - 02:19 AM

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The M101 Galaxy Group -- M51 Subgroup

M63: The Sunflower Galaxy

 

     

CMO GXY LSC Far 04.png

***click***

     -- Allan


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#698 AllanDystrup

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Posted 16 August 2023 - 01:31 AM

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Local Supercluster, Far: The Leo Triplets

The Eastern Leo Triplet

 

          

      I'm moving on now, to the two Leo triplets of galaxies, which are both located in a small galaxy spur (the 'Leo Cloud') below the Supergalactic plane (i.e. the Local Sheet of galaxies at 10 Mpc ~33 Mly). I start with the Eastern Leo Triplet:

          

          

CMO GXY LSC Far 05.png

***click***

 

     -- Allan

 


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#699 AllanDystrup

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Posted 16 August 2023 - 01:32 AM

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CMO GXY LSC Far 06.png

***click***

     -- Allan



#700 AllanDystrup

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Posted 17 August 2023 - 02:46 AM

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Local Supercluster, Far: The Leo Triplets

The Western Leo Triplet

     

     

CMO GXY LSC Far 07.png

CMO GXY LSC Far 08 crop.png

***click***

     -- Allan


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