Space 4e System Generation

[GilliganIII]

Originally Posted by dataweaver

(orbital radius / snow line radius) = (126 Kelvins / blackbody temperature) squared.

(Why 126 Kelvins? Because that's the temperature that I get when I plug the Snow Line radius into the formula in step 25. I'm seriously considering using 125 Kelvins instead, since it's a nicer number and I doubt that one Kelvin out of 126 will trash the system.)

Step 21, placing a predesigned world: R = (126/B)^2 * Rs
Step 25, blackbody temperature: B = 126 / square root of (R / Rs)
(In both cases, Rs = snow line radius.)

World Type Assignment Table: I pencilled in a column giving appropriate orbital radii as percentages of the snow line radius.

I've replaced the luminosity-based Inner Limit with 0.2% of the Snow Line radius. It requires computing the Snow Line before computing the Inner Limit; but that's not a major problem IMHO.

I find this is going to be extremely helpful with the white dwarf system I'm currently working on. I mean I know they have a stated luminosity of .001, but there have got to be exceptions, and I like to do the math to see what happens.

[MrId]

Originally Posted by Pomphis

I believe the Brown Dwarfs have a mass that is too large by a factor of 10, the given values would put them in the same range as K- and M-stars.

I had noticed that didn't seem right either, but I wasn't sure if it was a consistantly misplaced decimal point or something else. Hopefully errata will be forthcoming.

[Mgellis]

I noticed that, too. I checked some sources and they all seem to agree that a brown dwarf should mass about 10 to 80 Jupiter masses (i.e., about .01 to .08 solar masses). I'm going to treat it as a typo (i.e., treat the range in the book as .0015 to .07 solar masses, not .15 to .7 solar masses). Hopefully, there will be an official errata notice eventually.

Mark

Originally Posted by Pomphis

I believe the Brown Dwarfs have a mass that is too large by a factor of 10, the given values would put them in the same range as K- and M-stars.