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In My Traveller Universe Detail what parts of Traveller you do (or don't) use in your campaign.

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Old September 29th, 2013, 08:06 AM
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Default Voyager Alpha - Worldbuilding IMTU

More than a week ago I posted this in my T5 Web Apps thread:

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Originally Posted by thalassogen View Post
In the last week I worked primarily on another project...

For my own Traveller campaign I desired a more organic and more detailed star generation process and so I began to devise one of my own. The result is based on current astrophysics as far as I could get access to.

Stellar mass is generated using the Canonical Initial Mass Function. Stellar remnant mass is based on an observed initial-mass-final-mass relation for masses above 0.5 solar masses. Generated stars are aged through the main sequence and approximated/simplified evolutionary tracks based on initial mass. Radius, luminosity, and surface temperature (and thereby spectral and luminosity class) are calculated based on these internal models "for every day of a star's life". After a star's death its remnant's basic properties are also determined.

Stellar mass allows for orbital period calculations (aka year length). Radius provides needed details for Jump Drive operation. Change of luminosity is of interest to me because of changes in systems due to a heating up sun.

Would this alternate system (and that level of detail) be of interest to you?
To discuss this system, its "scientific" foundation, its game-related usage, and upcoming implementations, I decided to start this thread to separate it from my T5 Web Apps that should firmly be based on Traveller 5 rules as written and not on personal preferences. Some of the results of this project may flow back into T5 one day (especially stellar radius and mass for obvious reasons).
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Old September 29th, 2013, 12:17 PM
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I am currently looking for a way to calculate the snow/frost and rock lines of a system. Blackbody calculations based on early star's luminosity do not account for the temperature of the accreting disk itself and give really stupid results. Any hint towards a good treatment of the topic? My search fu is failing me and the next step would be a visit to the astrophysics library of the local university...
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Old September 30th, 2013, 06:14 PM
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OK, this one got solved. I had my blackbody calculations wrong - that accounts for the stupid results - and I had to investigate pre-main sequence protostars (T Tauri and family). Their luminosity is much higher than the newly created main sequence star. I account for this by increasing the luminosity accordingly and am getting nice results now.
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Old October 1st, 2013, 01:34 PM
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I just updated my online documentation of the project for you all to review: http://heldenhaufen.de/Va/Worldbuilding/Documentation

My next broad steps are:
- creation of planetary systems
- creation of worlds
- creation of life
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Old October 2nd, 2013, 08:31 AM
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Quote:
Originally Posted by thalassogen View Post
My next broad steps are:
- creation of planetary systems
- creation of worlds
- creation of life
This is really interesting, thanks for this.

There is a program called Accrete, based upon Rand Study which generates worlds from the protoplanetary disk to the final rocky (or gas giant) bodies. It may be a really interesting point to start for the next phase.
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Old October 2nd, 2013, 08:50 AM
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Thanks for the hint and links!
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Old October 3rd, 2013, 10:33 AM
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Quote:
Originally Posted by thalassogen View Post
OK, this one got solved. I had my blackbody calculations wrong - that accounts for the stupid results - and I had to investigate pre-main sequence protostars (T Tauri and family). Their luminosity is much higher than the newly created main sequence star. I account for this by increasing the luminosity accordingly and am getting nice results now.
Here's what I have:

Ice line: the orbital radius at which water molecules will condense into
ice. Inside this radius H2O ice will sublimate into vapor @ 152 K.
AU = sqrt(L)×2.7, solar constant ~ 188 W/m², albedo = 0.36. Terrestrial
planets and planetoids form inside the ice line, gas giants form outside it
(later they may migrate inward). During system formation, the ice line moves
outward as the protostar ignites and heats up.

Dust sublimation boundary / photoevaporation radius: the distance where
rocks (pyroxenes & olivines) and dust grains volatilize @ 800 - 1500 K,
sort of a "ice line" for silicates. AU = sqrt(L)×0.051, solar constant
~ 531 kW/m², albedo = 0.115. Planets cannot accrete inside this zone, but
large ones may migrate into it after accretion and survive intact. AKA 'Rock line',
the untenable orbits in the 2300 ref's manual
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Old October 5th, 2013, 09:30 AM
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Thanks for the input! I will gladly incorporate this.
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Old October 6th, 2013, 01:59 PM
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I am still collecting information and there is no complete planetary generation system as of yet, but I decided to adopt a planetary classification scheme roughly comparable to that of stars and settled on the following (inspired by several sources and tweaked to my personal taste): http://heldenhaufen.de/Va/Worldbuild...ationOfPlanets

Using this scheme, Earth would be classed MV, Mercury xhTVI and Pluto probably xhCVII.
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Old October 6th, 2013, 06:25 PM
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I don't know if it's of any use, but Tyge Sjöstrand was working on a set of system generation rules back in 2000. He eventually abandoned it but there are links to an HTML version and a PDF version here.
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