Editing Openai/691a2d9f-c044-8012-bccf-942bfce6334d (section)

===== Then realistically the path is: =====
* Don’t hope nature gives you the perfect one.
* Pick a long-period comet that: - passes near Earth or within reachable Δv window - has an orbital plane and outbound direction close-ish to the Alpha Centauri line
* And then: - apply propulsive nudges over many orbits - gradually precess/tweak its orbit so its outbound asymptote more closely aligns with your desired interstellar trajectory

Even then:
* You still won’t get a comet that goes to Alpha Centauri
* You only get one that is slightly better aligned for the first few thousand AU
* After that, your ship’s trajectory is its own; the comet is long gone.

So the role of such a comet is launch-corridor helper, not genuine “oasis halfway to Alpha”.