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In My Traveller Universe Detail what parts of Traveller you do (or don't) use in your campaign.

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Old April 3rd, 2018, 01:54 PM
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Default Real-universe jump distances

I built a spreadsheet of the 54 closest stars (including known brown dwarves) off Wikipedia's page and then added 14 additional near systems with known exoplanets within 31 LY.

I did some Excel magic to convert the right ascension, declination, and distance to X, Y, Z coordinates with Sol at 0,0,0.

I turned that into a matrix that shows the distance from each of those stars to each other, in parsecs.

I applied highlighting rules to call out the stars that were within 1 parsec of another star. With some COUNTIF rules, I was able to make a column for each star to show how many stars it could reach within 1.0, 1.5, 1.7, 1.9, 2.0, and 3.0 parsecs.

Of the 66 stars on my chart (including Sol), there are 2145 pairs of stars.

I can calculate how many (what %) of stars have a pair within a given distance. Furthermore, I can count how many stars are entirely unreachable.

12 pairs (0.56%) are within 1 parsec of one another. 55 (83%) are unreachable.

32 (1.5%) are within 1.5 pc. 40 (61%) are unreachable.

46 (2.1%) are within 1.7 pc. 35 (53%) are unreachable.

52 (2.4%) are within 1.8 pc. 33 (50%) are unreachable.

141 (6.6%) are within 2.0 pc. 0 (0%) are unreachable.

It's like our galactic neighborhood was built for jump-2.
Grand Duke Rhylanor, SPIN 2717 Rhylanor/Rhylanor A434934-F
Count Junidy, SPIN 3202 Junidy/Aramis B434ABD-B
Marquis Tuwayk/Deneb 0339
Marquis Smoug/Lunion 1729
Marquis Rech/Lanth 2112
Baron/ess Rech/Lanth 2112
Knight of Deneb Junidy/Aramis 3202
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