Just a quick update to say that I’ve posted an excel file showing the Stutterwarp Drive limit distances for pretty much every celestial body that anyone is likely to encounter in 2300AD, from the largest star to the smallest moon or ‘dwarf planet’.
I determined the distance of the “Threshold” (where Stutterwarp drops from FTL to sub-FTL) and the “Wall” (where it drops from sub-FTL to orbital velocity) by calculating the distance at which the gravitational field strength was 0.0001G (0.001 m/s²) and 0.1G (1 m/s²) – those distances are shown in AU in the red columns in the spreadsheet and are the most accurate numbers to use. Note that the Wall distance is also the maximum distance within which drives can be discharged around that body.
For comparison purposes, I also calculated the distances according to the formulae provided on pg 265 of the MGT 2300AD corebook – to calculate the limits for planets and sub-stellar objects, I extrapolated the formulae to use mass values measured in Jupiter Masses and Earth Masses. Note that the formula used in 2300AD to determine the stutterwarp threshold of any given planet is wrong (stutterwarp limits are nothing to do with planetary radius, and this formula produced results that are nothing like the real numbers for such worlds) – I’ve ignored it completely, so you should use the results from the table in the spreadsheet instead.
All distances are measured from the centre of the body. Note that the Wall distances for the smallest objects shown in the table may not actually be above the planetary surface, which means that (a) stutterwarp drives can continue to be used at sub-FTL speeds right up down the surface of these objects and (b) the drives cannot be discharged around these bodies.
You can download the excel spreadsheet here: