ジャーニーモード

import { circularSpeed, flipAndBurn, G0, GM_KM3_S2, hohmann, synodicPeriod } from "@johnmorrisdotca/uchusen-rockets/journey";

const AU = 149_597_870.7;
const mars = hohmann(GM_KM3_S2.sun!, AU, 1.52371034 * AU);
console.log((mars.seconds / 86_400).toFixed(1), "days,", mars.dv1.toFixed(2), "and", mars.dv2.toFixed(2), "km/s");
console.log(synodicPeriod(365.256, 686.98).toFixed(1), "days between windows");
console.log(circularSpeed(GM_KM3_S2.earth!, 6378.137 + 185).toFixed(2), "km/s in a 185 km orbit");

const ship = flipAndBurn(0.5 * AU * 1000, 0.015 * G0, 600);
console.log((ship.frameSeconds / 86_400).toFixed(1), "days at 0.015 g, half an AU");

258.9 days, 2.94 and 2.65 km/s
779.9 days between windows
7.79 km/s in a 185 km orbit
16.5 days at 0.015 g, half an AU

import { craftOf, planTrip, type BodySource } from "@johnmorrisdotca/uchusen-rockets/journey";

const AU = 149_597_870.7;
const day = 86_400_000;
const circle = (au: number, days: number) => (ms: number) => [au * Math.cos((2 * Math.PI * ms) / day / days), au * Math.sin((2 * Math.PI * ms) / day / days), 0] as const;
const source: BodySource = {
  stops: [
    { id: "earth", name: { en: "Earth", ja: "地球" }, kind: "planet", radiusKm: 6378.137, colour: "#4c88c4" },
    { id: "mars", name: { en: "Mars", ja: "火星" }, kind: "planet", radiusKm: 3396.19, colour: "#c76a3f" },
  ],
  positionAu: (id, ms) => (id === "earth" ? circle(1, 365.256)(ms) : circle(1.52371034, 686.98)(ms)),
  offsetKm: () => [0, 0, 0],
};

const trip = planTrip(source, craftOf("kaminari")!, "earth", "mars", Date.UTC(2026, 10, 4));
console.log(trip.verdict.line);
console.log(Math.round(trip.frameS / 86_400), "days,", Math.round(AU), "km to an AU");

Can do it: 0.52 per cent of the propellant, at 0.015 g.
37 days, 149597871 km to an AU

import { CRAFTS, duration } from "@johnmorrisdotca/uchusen-rockets/journey";

for (const craft of CRAFTS) console.log(craft.name, craft.drive);
console.log(duration(258.8 * 86_400));

Saturn V ballistic
Space Launch System ballistic
Falcon Heavy ballistic
ISV Kaminari, SPX-207 continuous
258 d 19 h