FA-69653 / Orbital propagation / Member archive

Hohmann transfer budget: Arrival burn keeps its sign · case 03

Inward transfers report a negative arrival burn and a reduced total.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Input [r1, r2, mu] circular radii. Transfer a=(r1+r2)/2; burn 1 = |v_peri - v_circ1|, burn 2 = |v_circ2 - v_apo| using vis-viva at each end; time of flight is half the transfer period. Works inward (r2<r1) too. Return [dv1, dv2, total] rounded 6 and tof rounded 3.

Why this case matters

Orbit determination and mission planning chain many small conversions; one wrong branch or unit silently moves a spacecraft by kilometres.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
hohmann transfer budget [8000.0, 7000.0, 398600.4418]	`[0.239347, -0.247477, -0.00813, 3232.011]`	`[0.239347, 0.247477, 0.486825, 3232.011]`	Failed

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