How short can Milankovitch Cycles be on a world with a stable orbit?

Okay so there's a project I've been thinking about for a long time wherein humans colonise a world where the climate appears warm and benign only to discover that the local climate oscillates from something like the height of the last Ice Age to something like the Medieval Warm Period on a decadal timescale (using Earth years for reference dating), that's at least 10 and not more than 99 years not swings every 10 years.

There are two ways I can see to do this, (A) use a bright star and a large, eccentric orbit, this is however very regular and predictable so option (B) is orbital forcing which I'd like to explore.

My question therefore is can I just drop three or four zeros from the period of the Milankovitch Cycle components and call it even or would that mean that the planet was too unstable in its orbit? If such a drastic increase in the "standard" variables isn't viable is there another orbital variation I could use to get the effect I'm looking for?

posted over 6 years ago

Ash‭

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