## Errors and Exospheres

First off, sorry about the delay. Looking back over part IV of my Yaccatrice workflow, I realized I screwed up almost every calculation I made. Trouble is, every time I try to recalculate things seem to come up different, so I’m setting my computer up plug and chug the calcs automagically. All of my formula look right and proper, so it’s just the numbers that are, “suspect.” It still looks like Sky Moon and Yaccatrice survive the revised numbers. To save myself from my own ineptitude and possibly make future efforts in this vein a little easier, I decided to automate some of the process in Mathematica. This slowed things down further.

While tracking down formulae I became curious about the minimum molecular weight retained(MMWR) calculation. Sometimes I like to actually know what I am doing and understand the rationale behind it.  One of the things I was curious about was how exosphere temperature was determined in GURPS Space.

I knew the basis of the MMWR calculation(in real world terms) was

Vesc > f Vrms,

where:

Vesc is the escape velocity of the body and Vrms is the root mean square thermal velocity and f is the ratio between escape velocity and RMS velocity.

While I was researching this, I discovered a recent thread on the sjgames board on this very subject. Following is the text of my reply.

Hopefully, this will be of use to my readers. That last formula, though with real world units is what I will use to determine the MMWR for Yaccatrice.

As a further note, due to the trouble I have had of late in keeping up with this blog, which is an important thing to me, I have decided to limit myself to weekly posts until I have a queue of at least six weeks of posts. I’d like for my blog to be a more reliable source of interesting information.

My next post will be my fixed information for Cintilla, Sky Moon and Yaccatrice. After that I will get back to my workflow.

Thank you for your understanding,

The Astrographer