Cain's model shows that when Jupiter was closer to the sun about a billion years ago, Venus likely had an eccentricity of 0.3. There would've been a much higher probability that was habitable at ...

An Earth-like planet orbiting a star one-quarter of the mass of our Sun with an eccentricity e > 0.2 in its habitable zone could experience what's called a “tidal Venus” catastrophe.

However, they may have to expand their search since astronomers are now finding asteroids co-orbiting Venus that could pose a threat. ... "There is a range of orbits with eccentricity < 0.38, ...