Sky River Project

[Spaceman]

Hello

Remember this?

One day maybe i create an add on which fills up Milky Way

Well, i start to create this addon . It's called "Sky River Project" and it's going to fill up the Milky Way with stars, thanks to this patch. If somebody else is also going to put stars in all the galaxy, please let me know. To do this project, i use Rassilon's Cluster Generator and the addon will contain lots of stars, planets, pulsars and black holes. Of course it's a personal project, but i don't know if i could upload it into the Celestia Motherlode . Images are coming soon. Any comment and help is welcomed

[BobHegwood]

Of course it's a personal project, but i don't know if i could upload it into the Celestia Motherlode .

Why not? Every add-on gets tested now, and - as long as it contains no advertising and performs as expected - you should have no problems uploading it to the ML.
Thanks, Brain-Dead

[Spaceman]

The program that i use and the textures-models are not mine. That's what i mean. I just don't want to do something illegal
Oh, don't forget that my addon need lot's of work, so the progress will be a bit slow. But i will finish it as fast as i can

[Hungry4info]

I did something like this once... but it wasn't quite as elegant as I think you're about to do. I simply shrank the galaxy to be a few tens of thousands of light years across, and placed it's distance at 0. Then with the 2 million star database, the galaxy was thereby filled.

Sol found itself once again at the galactic centre.

So with your add-on, how many stars do you intend to make? Are you going to make millions? Thousands?

If you don't make a large amount, when one is far from the galaxy they'll notice. Big blob of stars in one part of the galaxy, a sprinkle of stars for the rest of it. Et cetera.

I certainly wish you the best of luck! I would be interested in downloading this upon it's completion.

[Spaceman]

So with your add-on, how many stars do you intend to make? Are you going to make millions? Thousands?

I am not sure yet, but how about hundreds of thousands stars? This will be great, but there is a notice. Because i use Rassilon's Cluster Generator, the stars will have HIP numbers. So i try all those stars to not affect other addons. For example, i don't want my addon accidentally modificates stars from Star Trek or from Orion's Arm. Would you like an addon which chances the eta Carina addon? Of course no. So i try to prevent it.

If you don't make a large amount, when one is far from the galaxy they'll notice. Big blob of stars in one part of the galaxy, a sprinkle of stars for the rest of it. Et cetera.

Reiko proposed this:

To populate your galaxy with the cluster generator I found it is best to make about three clusters of about 100,000 stars each and place their centers about 200 ly from each other.
It makes a nice dense star field like in our region of the galaxy.
Set the planet generator to about 30% and you will have plenty of worlds to explore in your new galaxy.

My addon will be this: Clusters with 5.000 stars in all the Galaxy and 200 light years radius, placing there centers about 500 light years from each other. As about the planets, i need to find some informations i need to start the progress.
By the way, all the central stars will have names from persons like "Carl Sagan" and "Arthur Clarke"

I certainly wish you the best of luck! I would be interested in downloading this upon it's completion.

Thank you very much
Remember that is my first difficult addon (Nemesis was very easy), but i will do my best

(Sorry for the terrible English)

[Spaceman]

By the way, i need a realistic fraction of stars with planets. 30% is realistic enough? Is better more or less? I can't continue the addon unless i know a good enough fraction of stars with planets. Astronomers believe that maybe the 20% or even the 60% of Sun-like stars have planets, but the Galaxy in not only Sun-like stars.

Can you help me please?

[Spaceman]

? promised something

Images are coming soon.

Well here we are

planets.jpg

pulsar.jpg

yurihole.jpg

Until now, only one cluster is ready. Soon more clusters will be ready to explore. I'm very proud with this addon, it's makes me really happy
By the way, only 10% of the stars have planets-black holes-pulsars. It's better to keep it or make it bigger, like 20%?

[Hungry4info]

Unfortunately, I can't tell you the number of stars and be sure about it. It's an estimate, based off of incomplete knowledge. However, I'll give you some estimates that have been circulating around.



Hot Jupiter statistic:

Since the discovery in 1995 of a planet around the star 51 Pegasi by Mayor and Didier Queloz, more than 270 exoplanets have been found, mostly around solar-like stars. Most of these planets are giants, such as Jupiter or Saturn, and current statistics show that about 1 out of 14 stars harbors this kind of planet.

From here.


General planet statistic:

Using the HARPS (High Accuracy Radial Velocity Planet Searcher) spectrograph at La Scilla Observatory in Chile, the team were able to estimate that around one third of stars in the galaxy were orbited by planets.

From here.


What Fraction of Sun-like Stars have Planets?
http://arxiv.org/abs/astro-ph/0306524

The radial velocities of ~1800 nearby Sun-like stars are currently being monitored by eight high-sensitivity Doppler exoplanet surveys. Approximately 90 of these stars have been found to host exoplanets massive enough to be detectable. Thus at least ~5% of target stars possess planets. If we limit our analysis to target stars that have been monitored the longest (~15 years), ~11% possess planets. If we limit our analysis to stars monitored the longest and whose low surface activity allow the most precise velocity measurements, ~25% possess planets. By identifying trends of the exoplanet mass and period distributions in a sub-sample of exoplanets less-biased by selection effects, and linearly extrapolating these trends into regions of parameter space that have not yet been completely sampled, we find at least ~9% of Sun-like stars have planets in the mass and orbital period ranges Msin(i) > 0.3 M_Jupiter and P < 13 years, and at least ~22% have planets in the larger range Msin(i) > 0.1 M_Jupiter and P < 60 years. Even this larger area of the mass-period plane is less than 20% of the area occupied by our planetary system, suggesting that this estimate is still a lower limit to the true fraction of Sun-like stars with planets, which may be as large as ~100%.

[Spaceman]

Thank you very much Hungry4info

Now i have a problem. Watch carefully the next photos.

yuri.jpg

alexei.jpg

albert.jpg

Can somebody tell me why Ainstain has not stars around it? The nearest star of this cluster is 30 light years away and the next stars are in the other 2 clusters i create . No, i didn't chance the R, D, d and Core numbers. What i did wrong?

[Spaceman]

Hello

I make an experiment and i want your options. At first my addon was this: Clusters with 5.000 stars and 200 light years radius, placing there centers about 500 light years from each other. Now i change it: Clusters with 2.500 stars and 400 light years radius, placing there centers about 500 light years from each other. Watch the next images...

old.jpg

new.jpg

Less stars, larger clusters, better and more realistic look . Less is more
I'm going to reset all the addon and start it again, this time with the new way. What's your options?

[BobHegwood]

I make an experiment and i want your options.

You want options? Or opinions?
If the first, I have no idea.
If the second, you would do well to show the exact same area of space for a comparison so that opinions
could be based on the same data displayed in different ways.

[Spaceman]

You want options? Or opinions?

Oops!... I did it again . I mean "opinions"

If the second, you would do well to show the exact same area of space for a comparison so that opinions
could be based on the same data displayed in different ways.

I will make soon a better image for the new way

[Spaceman]

Hello

I deleted all the Sky River Project files and restarted the addon. Why? Because i have an idea
If you have the Cluster Generator, you will notice that you can create companion stars. Also you will notice that the companion stars are large .SSC planets with emission-true order. But what if the companion stars are .STC stars?

sky1.jpg

sky2.jpg

sky3.jpg

Do you like my idea?
Well, this will make the progress very slow and i need lot's of time to make even a single cluster . But I'm proud with this
Help, ideas and comments are welcomed

[Hungry4info]

Maybe you should write a star generator that might accommodate that.
If you're unsure how, bring up Microsoft Excel, write a binary-star .STC in there, and set the values to some random number, using literally MATH.Rand(). Every time you perform a new action in Excel, it'll change the numbers to a new random number.

It could be rather complicated to set up.

[Spaceman]

Well, i don't know how to create programs in Excel. Also i prefer to make some work by myself (no matter how time will take) because i want to make my project as nice as i want and be sure about this. Thanks for the suggest Hungry4info , but i prefer to make it by myself

A new update: Because only 1% of the stars have Earth-like planets, i rename them with names like "Simco System" or "Empear System", to find them easier

[Spaceman]

Hello

New feature for my addon

comet.jpg

Any star with planets orbiting around it (only) will also have some comets . Stars with companion stars and substellar objects, well... will not have comets

[BobHegwood]

Any star with planets orbiting around it (only) will also have some comets . Stars with companion stars and substellar objects, well... will not have comets

Can one ask why not?

[Spaceman]

Because how realistic is a comet orbiting around a central star, having and other stars orbiting around the central star? For me, it's unrealistic. A comet will change it's orbit continuously, because of the gravity from the other stars. Also it's a matter of balance. A star with companion stars and planets it's more interesting than a lonely star with only planets around it. So let's make the lonely stars more interesting with some extra comets

[BobHegwood]

Because how realistic is a comet orbiting around a central star, having and other stars orbiting around the central star? For me, it's unrealistic. A comet will change it's orbit continuously, because of the gravity from the other stars. Also it's a matter of balance. A star with companion stars and planets it's more interesting than a lonely star with only planets around it. So let's make the lonely stars more interesting with some extra comets:wink:

Sorry, but I simply do not understand this reasoning. If comets can exist around single stars, then they should also be in existence around multiple star systems.
Their orbits might be a bit more chaotic, but I really do not understand why they would not exist at all. This simply makes no sense to me. Sorry, but I am
Brain-Dead Bob too. Is there any scientific justification for what you are saying here?

Thanks, Bob

[Spaceman]

Their orbits might be a bit more chaotic...

See? Also in this topic Paolo said that "Comets with stable closed orbits in multiple star systems should be extremely improbable due to reciprocal gravitational effects"
But if you still like the idea of comets in multiple star systems, no problem I also like this idea, but i don't know how realistic is