> So, thoughts: The 100 diameter rule was originally intended to apply to
> planets, coming as it does direct from CT (where stars were just pretty
> lights in the sky). This means that the gravity at the jump point is
> 0.0025 % of the surface gravity. Now stars (taking the Sun as a model)
> are less dense than planets, so the diameter for a given mass is far
> greater. This means you have to travel *fewer* stellar diameters to
> reach a safe jump point. I put some figures together to come up with a
> rule of thumd, and I reckon that you can jump at only *20* stellar
> diamters. Gas Giants turn out to have a similar density (near enuogh for
> this sort of rough rule), so I've adjusted the gas giant jump point also.
Don't use the 0.0025% G-threshold. For our Sun it occurs at 500 diameters.
I know that sounds weird, but I worked through the gravity equations
several times just to convinvce myself. The distance (in diameters) to
a given g-threshold winds up being _inversly_ related to density.
ie. if one body has a density one-fifth that of a second body,
a given g-threshold of the first body will be at five times the
diameter-distance as the same threshold from the second body.
But my solution was the same as yours, and I just chucked saying
it was tied to anything other than density.
>
>
John H Bogan