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Forum » SpaceEngine » Mods and Addons » Firefly System (Planet systems from the TV show)
Firefly System
TalynDate: Saturday, 21.04.2012, 11:05 | Message # 1
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Ok I'm not even sure if this is possible but I was trying to create a fictional Solar System from a famous TV Show, and I found online this specs for the central Star.

Class: A0
Radius: 2.5 Sol
Mass: 3.2 Sol
Luminosity: 80 Sol
Temperature: 10,800˚K
Temp Color (RGB):(124,165,255)

There are some problems with this specs as you can see. To begin, the Class is not complete as it's missing the Luminosity Class and if I change it to any number form I to V, the mass and raduis get all messed up because SE calculates them and the script does not allow us to use ALL the parameters at the same time. If I leave the class as A0, SE will force the star to AOV

Is this a nood problem or is it really impossible to get that mass and radius/diameter with that kind of Luminosity in SE?





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Edited by Talyn - Saturday, 28.04.2012, 14:18
 
HarbingerDawnDate: Saturday, 21.04.2012, 12:13 | Message # 2
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You can specify Luminosity Mass and Radius in the catalog file.

Lum=Luminosity
Mass=Mass
Radius=Radius

That kind of star would be A0 V so don't worry about that.

So in the file you would put:
Lum 80
Mass 3.2
Radius 163560000

Temperature and color are described by the star's spectral class and are automatically interpreted by SpaceEngine.





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TalynDate: Saturday, 21.04.2012, 12:24 | Message # 3
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So there is no way to FORCE the temperature to be 10.800º K and the color as the light blue described in RGB, and still keep all the other parameters?




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HarbingerDawnDate: Saturday, 21.04.2012, 12:53 | Message # 4
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A0 V stars are light blue and will look as such in SpaceEngine, but it won't be super colorful as that would not be realistic. The temperature of A0 stars are also already very near the temperature you specified. As far as I know it is not currently possible to specify exact temperatures.

BTW, (198,216,255) is a more realistic color for a star of temperature 10,800 K.





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SpaceEngineerDate: Saturday, 21.04.2012, 19:58 | Message # 5
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To specify custom Mass and Radius, you should create a planets catalog (in data/catalog/planets folder) and create a star{} script there, as described in the star tutorial. You can also specify rotation, orbital movement (in case of a binary star) and other parameters. Temperature can be specified there too, but SE ignores it. You can however leave it, maybe in future versions I will have support for custom temperature.

*





 
TalynDate: Sunday, 22.04.2012, 11:00 | Message # 6
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Ok thank you very much SpaceEngineer.
I'll try that

Now back to my barycenter calculations of a quintuple star system with 7!! brown dwarfs "helioformed" to become mini-stars smile





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TalynDate: Monday, 23.04.2012, 21:47 | Message # 7
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I'm afraid I still don't fully understand the way barycenters work on multiple star systems and for that reason I'm having trouble with my "little" project sad

The problem is that in the Firefly Universe, the "verse" is composed by a central Star that has 4 smaller stars orbiting it like planets, and to make matters worse, there are also another 7 small class L stars orbiting the 5 main stars like moons and all of these stars have planets and moons arround them.

I am trully at a loss as to how to even begin to tackle this kind of problem

Obviously this is an impossible system in real life because 2 stars are orbiting the main star on each other L3 with different masses. With some cheating we can make it work but I still can't understand how many barycenters are really needed to force this kind of behaviour on all the 5 main stars + 7 "moon" stars sad

Here is a picture to ilustrate my problem:



If anyone knows how to setup this madness please let me know, because so far I can only make the main 5 stars with the "Core" planets but every time I try to add a planet to a star SE crashes and the Event Log is no help in finding the problem.





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DoctorDukeDate: Tuesday, 24.04.2012, 18:22 | Message # 8
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Quote (Talyn)
Ok thank you very much SpaceEngineer.
I'll try that

Now back to my barycenter calculations of a quintuple star system with 7!! brown dwarfs "helioformed" to become mini-stars


You're creating the 'Verse, aren't you? biggrin


Edited by DoctorDuke - Tuesday, 24.04.2012, 18:23
 
TalynDate: Tuesday, 24.04.2012, 18:52 | Message # 9
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Yes I am smile
But as you can see if you press the spoiler button on my last post, the 'Verse' is a nightmare to create and I ran into a few problems with the barycenters.

I gave up trying to calculate all the possible interactions and for my first version, I took the easy way out and decided to CHEAT dry .
Realism is overrated in the Verse anyway lol





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Edited by Talyn - Tuesday, 24.04.2012, 18:52
 
TalynDate: Tuesday, 24.04.2012, 19:49 | Message # 10
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On an unrelated note, I would like to leave an advice to all the "modders" out there so you don't have to through hours of head scratching like I did.

When using alternate names for Stars, make sure that you use ALL the alternate names when you reference it as the Parent Body or SE may crash, especially if you are using barycenters for double or multiple star systems like I am.





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SpaceEngineerDate: Tuesday, 24.04.2012, 20:38 | Message # 11
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Talyn
You should not use baryceneters at all. Just make these 4 stars orbiting the main star, like the planets. OIf main star is much more massive than its satellites, such a system may be stable. But these red and orange suns should be in Lagrange points of each other, and have very different masses, otherwhise they will collide after a few milions years.

Why do modern sci-fi autors hate physics? smile

*





 
TalynDate: Tuesday, 24.04.2012, 21:03 | Message # 12
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Well, if you can, take some time to read the TVIN.PDF V2.0
Here is the link

A very interesting reading on hou to turn "a bunch of hooey into science" or how far a lot of dedicated fans go to make sense of something that has none biggrin

Aparentlly the human race as found a way to terraform planets by adjusting the orbital parameters with a "Gravity Tool" that is present in every aspect of the verse, from terraforming to spaceships.

So it is not unreasonable to extrapolate that in the futures they will be able to avoid that catastrofic colision by moving a star to a more convenient location biggrin





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TalynDate: Wednesday, 25.04.2012, 00:43 | Message # 13
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Quote (SpaceEngineer)
Why modern sci-fi autors hate physics?


A picture is worth a thousand words.
I don't see how this thing can be stable at all biggrin



Here you can see the stars and the brown dwarfs that were "helioformed" to become small suns and one planet arround the central star

Still a lot of work to do because all of these stars have they're own solar systems with planets moons and asteroids, hundreds of objects in total, so if anyone is willing to help me is very much welcome smile

Attachments: 8195145.jpg(58Kb)





PC: Intel Core2Duo E6850 @ 3.00 GHz & 4GB DDR3 @ 1333 - NVIDIA GeForce 8800 GTS with 640 MB VRAM
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SpaceEngineerDate: Wednesday, 25.04.2012, 01:48 | Message # 14
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Lighting may glitch in this system. SE supports up to 4 light sources per celestial body and up to 4 solar eclipses per each sun (a "planet" eclipse, then some moon occludes light from other planet or moon, is disabled in code because of performance). SE automatically chooses 4 brightest light sources, in multiple star system this is usually the suns. But a huge gas giant may suddenly become the brightest source for some moon as it moves around it and the giant's phase becomes full. Also, a well-known bug with solar eclipses may appear in this system - when one satellite star occludes the central star, the eclipse shadow on the distant planet surface may appear as randomly blinking black squares.

*





 
DoctorDukeDate: Wednesday, 25.04.2012, 09:14 | Message # 15
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Talyn
I might be able to help you with coding and/or testing (my RAM + processor can have a punch, plus I'm a big fan or Firefly biggrin ).
 
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