Where do ships exit Jump Space?

[Ranger]

Is there a canon answer to where a ship exits jump space in a system? I recall reading a JTAS article that said that ships exit at 100 diameters of the largest bodies in system, with choice of targets growing with the drive number. i.e. A jump 1 ship comes out at 100 diameters of the main star. Jump 2 ships get to choose between the main star and the largest planet in the system, etc. It seems logical, but looking at the MD ratings of the ships and how long it takes to move in system, this could add days, or even weeks in some cases to travel time in movement from exit point to destination system.

Thanks in Advance,

Rob

 

[Ellros]

Pages 343-344 of the T20 rulebook have a pretty good description of it.

A perfect jump is hitting the 100 diameter mark. A typical Astrogator gets within 110 diameters about 30% of the time, and within 125 diameters about 90% of the time.

 

[Ben W Bell]

Of course if you are a scout for an invasion or something you'll probably come out well away from anything in the void between planets so the flash doesn't give you away and coast in while scanning. So you can pretty much come out roughly where you want as long as it isn't within 100 diamaters of a body.

 

[s-feige]

Ranger : Is there a canon answer to where a ship exits jump space in a system? [...]

The only thing I remember is from MT. The GM's companion published some travelling flow-charts, where the navigator could decide, where he wanted to come out in the targeted system, i.e. Gas Giant, Mainworld,... Of course one would arrive at least 100 diameters out.

IMHO, planning to arrive at, for example, a planets moon you'd additionally have to calculate a. at least 100 diameters the central star, b. at least 100 diameters the planet c. at least 100 diameters from the moon.

Have a nice day,
Aldan Romar

 

[shield]

Aldan is right, the navigator gets to choose which body they appear 100 diameters from i.e. gas giant / star / mainworld. Apparently the gravity gradient causes the ship to automatically precipitate out of jump when it crosses the 100 diameter line.

I think being forced out of jump space must strain the engines, otherwise why do the navigation, just aim for the main planet.

Cheers
Richard

 

[s-feige]

Richard : [...] Apparently the gravity gradient causes the ship to automatically precipitate out of jump when it crosses the 100 diameter line. [...]

Yep. At least IMTU. I always like to use this as a 'minor misjump failure', or as a plotdevice to get my PCs where I want them...

Have a nice day,
Aldan Romar

 

[Vargas]

At the off ramp?

 

[Mysterion]

Originally posted by Vargas:
At the off ramp?

Yes. But they hardly ever clean the rest-rooms at those gas stations...

 

[Mysterion]

Originally posted by RichardP:
Aldan is right, the navigator gets to choose which body they appear 100 diameters from i.e. gas giant / star / mainworld. Cheers
Richard

Okay, here's a question. The ship's computer will probably know where the planet in question wqill be in terms of usual distance from the system's sun, but how does it know where in the plant's 360-degree orbital path to find the planet?

 

[GBoyett]

Originally posted by Mysterion:
Okay, here's a question. The ship's computer will probably know where the planet in question wqill be in terms of usual distance from the system's sun, but how does it know where in the plant's 360-degree orbital path to find the planet?

Same way it would know the distance. The navcomp would have the orbit formulas for the mainworld, secondary worlds, gasgiants, important asteroids, and moons of each system that is stored. Even today the formulas are relatively easy to compute.

 

[Nurd_boy]

way, way to technobabblish......
ships reappear where the GM wants them to be (ex: if the GM wants the pc's to explore an abandoned survey ship in a gas giant, the pc's ship appears where they can get a sensor read on the survey ship..) and where in an orbit a particular planet is really isn't that relavent, just have them appear above the solar plane, that way, a planet is the same distance no matter where it is in orbit (think cone shape with the pc's ship at the apex and the planet orbiting at the base).

this imtu, gets 'incoming traffic above/bellow outbound and thus out of the way...