Where does one come out of Jump?

[Putraack]

I'm curious, and/or obsessive about details.

When a ship performs an inaccurate Jump, how far away from their target do you think they should pop out? That is, how much more in-system travel time should I give them?

Related to that, I suppose, is there an easy way to guesstimate how far out a system's gas giant should be from the main world?

I'm using Mongoose rules, but I have Classic available to me, FWIW. Short of using the Scout rules to thoroughly generate each system, I am just rolling some dice. I'd rather have some kind of formula.

 

[Whipsnade]

I'm curious, and/or obsessive about details.

But you don't want details. In your post you state you want a guesstimate and a formula you follow regardless of the actual situation.

When a ship performs an inaccurate Jump, how far away from their target do you think they should pop out? That is, how much more in-system travel time should I give them?

You should give them what extra travel time you as the GM feel the game requires at that moment.

How do you determine they made an inaccurate jump? Does the navigator "fail" in some way? If so, use the amount he failed the roll by to determine how far off they are; i.e. failed by 3 so they're 0.3, 3, 30 hours, mega-km, AUs, or whatever off. You just want a WAG, right?

Related to that, I suppose, is there an easy way to guesstimate how far out a system's gas giant should be from the main world? I'm using Mongoose rules, but I have Classic available to me, FWIW. Short of using the Scout rules to thoroughly generate each system, I am just rolling some dice. I'd rather have some kind of formula.

The explosion of extrasolar planet discoveries in the last decade mean we've no freaking idea where gas giants "should" be. While all Traveller sysgen methods placed them at or beyond a system's "snow line" and beyond the life zone orbit, we've detected gas giants in orbits more like Mercury's than Jupiter's.

Again if you want a WAG and using Traveller's now-very-broken assumptions, any gas giant should be at least two orbits out from the mainworld in it's life zone. The gravitational effect of gas giants "seem to" and "should" disrupt the formation of smaller worlds near them, so Jupiter prevented the formation of a planet between it and Mars resulting in Sol's Asteroid Belt. Maybe...

 

[aramis]

I'm curious, and/or obsessive about details.

When a ship performs an inaccurate Jump, how far away from their target do you think they should pop out? That is, how much more in-system travel time should I give them?

Related to that, I suppose, is there an easy way to guesstimate how far out a system's gas giant should be from the main world?

I'm using Mongoose rules, but I have Classic available to me, FWIW. Short of using the Scout rules to thoroughly generate each system, I am just rolling some dice. I'd rather have some kind of formula.

The official CT answer for an Accurate one is 3000km per parsec jumped. (Miller, Marc W, Jumpspace, JTAS #24, p. 35)

CT's maximum innacuracy is the misjump, which can be up to 36 parsecs in any direction from start ((1d6)d6 parsecs).

MT says...
superficial mishap: 1d6+4 days, otherwise unharmed.
Minor: 1d6*8 hours travel from destination point (also 1d6+4 days in jump)
Major: misjump
Destroyed: destroyed.

TNE provides a another, similar set of answers...
A failure is 1d6+4 days in jump, but on target.
a catastrophic failure is 2d6x100 diameters, rather than the TNE standard 100 diameters, as well as 1d6+4 days spent in jump.
Aggrivated catastrophic failure is 1d6+4 days, and (1d6)d6 for distance, in random direction, ending in orbit number (1d20-1).

 

[Putraack]

But you don't want details. In your post you state you want a guesstimate and a formula you follow regardless of the actual situation.
... You just want a WAG, right?

Well, I want a *consistent* WAG. One that I can remember, or write down, between this month's game and next month's.

The (amount of miss) * some number of hours sounds good.

 

[77topaz]

I'm curious, and/or obsessive about details.

When a ship performs an inaccurate Jump, how far away from their target do you think they should pop out? That is, how much more in-system travel time should I give them?

Related to that, I suppose, is there an easy way to guesstimate how far out a system's gas giant should be from the main world?

I'm using Mongoose rules, but I have Classic available to me, FWIW. Short of using the Scout rules to thoroughly generate each system, I am just rolling some dice. I'd rather have some kind of formula.

They'd have to be outside the 100D line of the star (I think).

 

[Fritz_Brown]

While all Traveller sysgen methods placed them at or beyond a system's "snow line" and beyond the life zone orbit, we've detected gas giants in orbits more like Mercury's than Jupiter's.

Actually, when using the full system generation rules in LBB6, they can be in the habitable zone, Whipsnade. It's not common, but it can happen.