Aurora 4x
New Players => The Academy => Topic started by: Caesar on July 28, 2011, 09:10:33 AM
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For ease of both myself and others I have calculated the terraforming costs and perfect atmospheric balance for all four colonizable bodies in Sol. All calculations made are based on the standard human colony costs. I took care to calculate in the maximum oxygen percentage, temperature values (taking 10 degrees Celsius as a goal temperature) and minimize effort.
General Notes:
Calculating the necessary amount of (anti-)greenhouse gases is always my first step, given that N2 and O2 will not have a significant impact on the temperature.
I use CO2 as greenhouse gas. You can replace it with Safe Greenhouse Gases.
I use N2 to ensure that the percentage of O2 is below 30%.
I aim for 28% in my calculations when the percentage of O2 would become too high.
I always use 0.105 atm of oxygen.
CO2 - 0.227 atm (~61%)
O2 - 0.105 atm (~28%)
N2 - 0.043 atm (11%)
Total: 0.375 atm
Total changes in atmosphere: 0.365 atm
Effort: Minor
Notes: None
AGHG - 0.670 atm (~86%)
O2 - 0.105 atm (~14%)
Total: 0.775 atm
Total changes in atmosphere: 0.775 atm
Effort: Moderate
Notes: AGHG stands for Anti-Greenhouse Gasses
CO2 - 3.000 atm (~97%)
O2 - 0.105 atm (~03%)
Total: 3.105 atm
Total changes in atmosphere: 4.705 atm
Effort: Significant
Notes:
- Terraforming will be incomplete.
- End Temperature will be ~229.8 K or -43,2 C.
- For colony cost 0 a modified species will be needed.
CO2 - 0.146 atm (~39%)
O2 - 0.105 atm (~28%)
N2 - 0.124 atm (~33%)
Total: 0.375 atm
Total Changes in atmosphere: 99.835 atm
Effort: Practically Impossible
Notes: A fully terraformed Venus might be the pride of the empire.
Please note that I am not trying to insult anybody by explaining the mathematics behind my calculations. I am trying to make it as clear as possible, even for those who would otherwise not understand algebra.
You can use my methods yourself if you wish to calculate the colony costs of any other planet (for example: In another solar system).
We will use these formulas:
Base Temperature in Kelvin x Greenhouse Factor x Albedo = Surface Temperature in Kelvin
Greenhouse Pressure = [Greenhouse Factor - 1] / 1.1 OR Greenhouse Pressure = [Greenhouse Factor - 1] / 0.9
The first formula is for when the body is colder than you want. The second formula is for when the planet is warmer than you want.
This formula substitutes the default. Basically every 1 atm of greenhouse pressure counts as a Greenhouse Factor of 1.1 because of the fact that it is ALSO Atmospheric Pressure.
Greenhouse Factor = 1 + (Atmospheric Pressure /10) + Greenhouse Pressure (Maximum = 3.0)
Note that the maximum Greenhouse FACTOR is 3.0.
We will substitute Greenhouse Factor with Z, and Greenhouse Pressure with Y.
Let's say we take Mercury for an example.
Our goal surface temperature is 283 degrees kelvin (10 °C).
The Base Temperature and Albedo are found on the environment tab.
We will want to know the necessary Greenhouse Factor.
700 x Z x 1 = 283
700Z = 283
Z = 283/700 = 0.404
We have calculated our necessary Greenhouse Factor. We can now add this data to the other formula.
The planet is HOTTER than we want, so we will take the / 0.9 variation of the formula.
Z = [0.404 - 1] / 0.9
Z = [0.596] / 0.9
Z = 0.67 atm of anti-greenhouse gases.
Note: We can not have a negative amount of gases. Thus we took an absolute value and removed the minus.
We will also need 0.105 atm of O2.
Our final step is to see if we exceed the 30% oxygen mark.
Basically, if the total atmospheric pressure is above 0.375 we do not exceed the 30% maximum.
We can also calculate the percentage of oxygen:
O2 (atm) / Total Pressure (atm) x 100 = Percentage of oxygen in the atmosphere.
It is the same for all other gases.
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Whoa, this is awesome! I've been having a bit of trouble figuring out exactly what to do with my terraformers, and this helps out a lot (especially your explanations). Thanks!
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You're welcome!
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Eventually, I'll construct an enormous orbital-hab terraformer to do venutian worlds-- I have several of them near the core of my empire, so clearing them out would give me several more population farms.
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I have just sent a few terraformers to a planet with a rating of 28+
I am incredidibly short of Gallicite and it has 56mT at 1 - I am going to start with auto mines but gradually build up the terraformers and start adding inf and people with ordinary mines in a few years..
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Good luck with that. It sounds like a huge project.
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A question about terraforming. What to do to have the colony cost falls under 2.000. There is a barrier of a kind on colony cost here... it is reduced progressively until 2, and then stop at this limit. I suspect you can go below 2 only if all criteria are in the living zone of your specie, right?
And I never saw a number >0 and < 2, so either this is 0, 2 or higher, right?
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There are a couple factors that prevents a colony from going below 2.0 cost. Firstly you need to have a acceptable temperature for the selected species. Secondly no harmful gasses can be present having more than 2-5% of a harmful gas will force the colony to remain 2.0 or even 3.0 for the more deadly types, until its gone. Thirdly a propper pressure is needed. If its beyond the racial tolerance for pressure it will have a cost. So getting everything balanced and nasty gasses removed can sometimes be painstakingly slow.
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And I never saw a number >0 and < 2, so either this is 0, 2 or higher, right?
No. Once you've got the right gas mixture, the cost will be controlled by temperature. This will smoothly decrease to 0 as the temperature approaches your race's range.
John
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No. Once you've got the right gas mixture, the cost will be controlled by temperature. This will smoothly decrease to 0 as the temperature approaches your race's range.
John
Keep in mind that there is one factor that you can't affect, gravity. If it is outside your racial tolerance you can't get too zero, at least not without using gene modification.
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I don't suppose there is an anti-greenhouse gas that exists in reality, as such?
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One could consider a gas that increased albedo-- like some oxides of sulfur and nitrogen-- anti-greenhouse as they can reflect light from the planet. The negative effects of these gasses are rather bad, so using them on a global scale isn't such a great idea (on earth).
I consider it to be little orbital reflectors for my own RP purposes.
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This should be in the wiki.
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This should be in the wiki.
The wiki is painfully lacking on many topics, and outdated on some. The entire thing needs to be overhauled/nuked and redone.
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Folks is busy. I finally defended my thesis, so once I get a little kinks out of the way i'm going to get permissions and work on some of it. The rest of the newb community should think about it as well ;)
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The wiki is painfully lacking on many topics, and outdated on some. The entire thing needs to be overhauled/nuked and redone.
Everyone is welcome to add to the wiki. Some pages are protected and require 5 edits and 4 days account age. If you add/change a link on the main page, include the version you are writing to.
One idea would be to maintain the current wiki, and segment off the pre-5.0 pages and the post-5.0 pages.
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This should be in the wiki.
The entire purpose of a wiki is so that people who think something should be in it can add it themselves.
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This should be in the wiki.
I would gladly allow anybody to put it into the wiki. I have neither rights nor time to do it myself currently, but I think that if it'd help new (older?) players, it should be in there.
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well, I've been busy making a program to calculate this for me, I have it working, not complete yet but if you want me to release it when it is I can, C# and I'd release the source code along with it
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Your calculations worked well for me as Mercury is now the prime luxury destination for our extreme sunbathers. Venus is underway but will take a much longer time.
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Your calculations worked well for me as Mercury is now the prime luxury destination for our extreme sunbathers. Venus is underway but will take a much longer time.
Happy to be of service.
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well, I've been busy making a program to calculate this for me, I have it working, not complete yet but if you want me to release it when it is I can, C# and I'd release the source code along with it
Sounds Spiffy 8)
Much better than me setting up a spreadsheet (or writing one using VS2008), or just doing it 'manually' :)
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Looks nice.
Maybe we can now get a calculation about at what point Orbital Habs or Infrastructure are a cheaper way of placing a 100m Population on a Planet?^^
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Actually a programm would be neat if you could extract the System-data out of aurora on the fly, for every system you know. Also non-standard-Human races could be considered at this point if the calculations are known.
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Actually a programm would be neat if you could extract the System-data out of aurora on the fly, for every system you know.
Like the Clipboard button? Or are you looking for something else?
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Well i would prefer something that wouldnt need any active interaction other then starting the tool and maybe selecting the right species.
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Is there some kind of reference about all the gases? Like which ones have an effect on temperature (and how much) beyond the generic safe greenhouse/anti-greenhouse, and any way to know which ones are toxic/posonous to your race?
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The system survey window (F9) tells you if a planet has toxic gasses.
Other than that:
http://en.wikipedia.org/wiki/Greenhouse_gasses
explains which gasses have an greenhouse effect and which are neutral.