Stellar distributions for M31, M33, NGC 300, NGC 404, M81...

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Cham M
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Stellar distributions for M31, M33, NGC 300, NGC 404, M81...

Post #1by Cham » 16.09.2011, 22:08

I'm releasing some large stellar distributions for three spiral galaxies : M31, M33 and NGC 300. Of course, the stars are fictious, but they follow a realistic "HR diagram", based on the AbsMagn and Spectral Classes found in Celestia's default database. Only very luminous stars are included (AbsMagn from 0 and up), so we could see them in Celestia if we're standing at some reasonable distance.

The user could easily edit the STC files to is/her taste (for SF scenarios, for example). This way, you could define some main sequence stars by changing the AbsMagn and Spectral Class values. Add you own planetary systems, spacecrafts, etc, in the Andromeda galaxy, or in its neighbor's M33, or even in a "far away galaxy" (NGC 300).

Stop polluting our Milky Way ! :lol:

http://fsgregs.startlogic.com/Public_Fi ... utions.zip (2.8 MB)

You'll no longer see M31, M33 and NGC 300 the same way as before ! :mrgreen:

A few tips : Turn ON star labels, use the "Disk" rendering for stars. Visit the center of M33 (there are two STC files in this case, for alternate distributions. Don't use both at the same time).

Enjoy ! :)

User feedback would be appreciate, for better future stellar distributions...
Last edited by Cham on 25.01.2014, 18:01, edited 3 times in total.
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Cham M
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Re: Stellar distributions for M31, M33 and NGC 300

Post #2by Cham » 17.09.2011, 00:56

Take note that I made a small mistake in the numbering of the stars in M33 :oops: . There are two STC files in this case. I strongly suggest that you erase the first 10 000 stars in the second file, so there isn't any name conflict with the first file, if you want to use both at the same time.

EDIT : There are several other small spiral galaxies in the local group that may be worth populating with stars :

IC 810,
IC 3044,
NGC 404,
NGC 4396,
IC 3094 is an S0 galaxy of radius 554 LY only. Easy to add a very high density of stars ! And the absence of arms makes it ideal for a radial distribution with high density. 8) Hmmm, temptation, temptation ! :lol:
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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #3by Cham » 17.09.2011, 02:50

Couldn't resist. Took 1 min to do ... :mrgreen:

5000 stars on a disk of 554 LY radius. Mean distance between adjacent stars : around 7 LY.

So1.jpg

S02.jpg


IC3094_stars.stc.zip
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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #4by Reiko » 17.09.2011, 05:16

This is exciting! :D

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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #5by Cham » 17.09.2011, 12:26

And here's NGC 404 for breakfast :

NGC404_stars.stc.zip


5600 stars on a 4951 LY radius pizza. Less than 120 LY on average, between adjacent stars.
It's beautifull, with the "Scale disk" option turned ON... Visit the galactic core ! :)

The stars default name ("S0") should be changed to something better. I'm lacking imagination here...
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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #6by W0RLDBUILDER » 17.09.2011, 16:56

Cool. I'm going to download all of them.

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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #7by NoXion » 27.08.2012, 06:04

Hey Cham, these are awesome. Thanks for creating and sharing them!

How did you make them? I'm interested in adding stars to other galaxies such as Sagittarius dSph and the Large Magellanic Cloud.
Currently worldbuilding!

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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #8by Cham » 27.08.2012, 13:49

NoXion wrote:Hey Cham, these are awesome. Thanks for creating and sharing them!

How did you make them? I'm interested in adding stars to other galaxies such as Sagittarius dSph and the Large Magellanic Cloud.

The star distributions were generated using Mathematica, an heavy math software (not for the faint of heart).
Lots of maths are implied here.
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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #9by NoXion » 27.08.2012, 19:20

Cham wrote:The star distributions were generated using Mathematica, an heavy math software (not for the faint of heart).
Lots of maths are implied here.

Ouch, I was hoping it would be something fairly simple so maybe I could use it for my own purposes.

I certainly wouldn't mind seeing more stellar distributions from you! :)
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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #10by Cham » 27.08.2012, 19:32

I may do some more in the future, if I could find some time.

I may also publish my 1 million stars database for M31 (the Andromeda galaxy),
but the file is huge and is slowing down Celestia's startup.

To make some nice screen captures, the M31 Mega stars database is really cool, though.
Last edited by Cham on 28.08.2012, 01:08, edited 2 times in total.
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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #11by John Van Vliet » 28.08.2012, 00:53

--- edit ---
Last edited by John Van Vliet on 19.10.2013, 04:41, edited 1 time in total.

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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #12by Reiko » 28.08.2012, 19:25

Mathmatica gave me a nose bleed trying to learn how to use it. I had to ask Fridger to teach me how to just enter an equation into it. :lol:

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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #13by omega13a » 30.08.2012, 02:25

Cham wrote:Couldn't resist. Took 1 min to do ... :mrgreen:

5000 stars on a disk of 554 LY radius. Mean distance between adjacent stars : around 7 LY.

So1.jpg

S02.jpg


IC3094_stars.stc.zip

Since that one is so small could you generate some main sequence stars for IC 3094? Please?
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Re: Stellar distributions for M31, M33 and NGC 300 (and more

Post #14by Cham » 25.01.2014, 17:48

I'm publishing a distribution of 50 000 luminous stars for the spiral galaxy M81 :

http://fsgregs.startlogic.com/Public_Fi ... _stars.zip (1.8 MB zip file)

There's a small SSC solar system included, without any textures, that you may use as a template. It is associated to the first star in the distribution.

Take note that this addon may not work properly on your system, since M81 is located at 12 millions LY from Sol, so it's a bit outside the theoretical maximum distance of Celestia to draw stars. It's working perfectly on my computers, thought.

Take also note that all the stars in this distribution are very luminous stars, so we could see them in Celestia, at a reasonable distance. Their Absolute Magnitude and Spectral Class are from Celestia's default database, so they are realistic luminous stars.
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Post #15by roninwolf1981 » 05.05.2018, 01:56

I know it's been 4 years since this thread has been in use, but I'm wondering if the stars used for M33 are the same as the filler disk stars found in the Star Wars mega zip file found in the Celestia Motherlode.
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