[FT] Jump Point

Let's assume that the jump limit for a star is based on the square
root of the mass (with Sol set as 1)--this way gas giants and planets
can also have jump limits. How far out from the sun should the jump limit be?

On Wed, 1 Oct 2003 21:51:13 -0400 Laserlight <laserlight@quixnet.net>
wrote:

> Let's assume that the jump limit for a star is based on the square

This sounds like you're considering the local gravitational field strength to
be the limiting factor. That said, you might do better to
consider what you want the limit to be for, say, an Earth-like planet;
set _that_, and then scale up for a star, gas giants, etc. And remember
that it is possible (haven't crunched the numbers) that one could lie inside
the other...

Phil
----
Could Batman join the Narn Bat Squad, or would he set up the Bat-Narn
Squad? <g> If you have an answer to that, do NOT send it to

From Laserlight:

> Let's assume that the jump limit for a star is based on the square

If we say 1km/

Sun: Mass ~ 2e30 kg, Sqrt = 1.4 e15:

Assume that Hyperlimit = Sqrt(mass)/Factor in km:
Factor = 1e8 =: ~14 AU, which is outside the orbit of Saturn Factor = 2e8: =
~7 AU, which is Between Saturn and Jupiter Factor = 3e8: = ~4.7 AU, which is
"just" inside Jupiter's orbit

Taking either of the last two and 1mu = 1000 km

Jupiter: Mass ~1.9e27 kg, Sqrt = 4.4e13 Factor = 2e8: = ~220 MU Factor = 3e8:
= ~147 MU

Earth: Mass ~6e24 kg, Sqrt = 4.4e13 Factor = 2e8: = ~12 MU Factor = 3e8: = ~8
MU

Mars - About an MU either way.

What's going to govern in-system jumps? Say you have to stop at the
solar hyperlimit. Can you then jump to a planet's hyperlimit?

If you force Earth's limit to be about 10x or more than these calculations,
the solar hyperlimit goes out to beyond pluto, unless you
add further non-linearity to the equation.

Here's a very ugly exponential:
Dist (MU) =73.568*e^(4.8643e-15* (Sqrt(mass)))

WHich gives:

Earth = 74.5 MU Jupiter = 613 MU Sol = 70,164 (Inside Jupiter'sorbit, outside
the main belt.

> What's going to govern in-system jumps? Say you have to stop at the

I've always thought of it as being that you couldn't jump inside a Jump Limit
at all. If so, and if the Sun's jump limit is around the Belt or farther (as
it has been in most suggestions I've seen), then
it doesn't matter what the Earth's limit would be--although Jupiter or
Saturn might still matter.

This would tend to give us higher velocities because you'd have to move from
the jump limit to the habitable planet under normal thrust.

If you think of the Jump Limit as being a change in speed limits, then the
Earth's field may add to the Sun's field. You may see ships with a lower real
velocity because they just make microjumps to get to the target.

> On Thu, Oct 02, 2003 at 06:32:40PM -0400, Laserlight wrote:

> I've always thought of it as being that you couldn't jump inside a

I take the approach that what's marked on charts as the "Jump Limit" is
in fact the _safe_ limit. You can try to jump to or from a point within
that - it just gets vastly more hazardous the deeper into the well you
get; you arrive somewhere else, back where you started, or not at all.

R