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Old March 6th, 2007, 09:59 PM
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I had thought that jump masking with respect to a system's star was controversial and didn't make it into Traveller canon until GURPS Trav.

But, tonight, while perusing Book 6, what do I see?

Pg. 42, Book 6: "[Stellar] Radius can also be used to determine minimum jump distance from a star (misjumps are more probable inside 20 radii and 200 radii from the star)."

Here again, I see a concept first imagined in CT (when popular belief is that it was grown into Traveller canon through later rules sets).

But, my question is...

There really isn't an easy way to figure stellar jump masking on the fly during a Traveller game, is there?

In this day and age, where I am able to use a program like Heaven & Earth, I usually print out the details about a world that I know my players will visit and maybe a few worlds around it. Heck, in just a few moments, I can have H&E detail the entire subsector and print that stuff out to have on hand in case my player stray from where I intend them to go during the game.

But, I was looking for a quick fix. I wanted to see if there was a quick way to determine stellar jump masking on the fly. And, right now, I'm at a loss.

It looks like you'd have to detail the star (at least some details), and then figure orbits and place planets and the main world before you could find this's really something that needs to be done pre-game.

I look at the Orbital Distances and Habital Zone Distance tables on pg. 46 of Book 6, and Stellar Radii chart on pg. 47 of Book 6. What I see is that (according to the chart on pg. 46) stellar masking can reach far into the star system.

According to the chart on pg. 46, Terra is jump masked in our star system. Well, it look to be right on the edge.

But, if a ship were to travel to Venus or Mercury, it'd surely falling within the jump masked area of Sol.

If you were leaving Terra, you'd have to plan your flight outsystem, away from Sol, before you were able to safely engage the jump drive.

Am I missing something? Is there an easy way to look at Traveller data and know if the main world in the system is masked by the system's star?

If there is, enlighten me. Because I don't see it. It looks like one would have to detail much of the system--at least the early orbits--before jump masking can be accuratly guessed at.

Anybody got a better system?
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