I read about this tennis court sized asteroid https://www.theguardian.com/science/2021/nov/11/near-earth-asteroid-is-a-fragment-from-the-moon-say-scientists

It appears to be between the Moon & Earth but in a weird orbit. Are there any asteroids which are easier to reach than the Moon? We could then maybe use it as a staging point for the Moon or Mars.

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    $\begingroup$ No asteroid could be between Earth and Moon for more than a very short time. Such a trajectory is impossible. The asteroid mentioned in the article is not between the Moon & Earth. Please read the article again very carefully. $\endgroup$
    – Uwe
    Dec 9, 2022 at 9:56
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    $\begingroup$ @Uwe - Why is this impossible? This video talks about orbital resonances. The Planets Are Weirdly In Sync. Can't such a resonance stabalize an asteroid between the Earth and Moon? $\endgroup$
    – mmesser314
    Dec 10, 2022 at 23:30
  • $\begingroup$ An asteroid in resonance between Earth and Moon is still between them only for a very short time. With resonance we get only a periodic repetition. $\endgroup$
    – Uwe
    Dec 11, 2022 at 8:45
  • $\begingroup$ If there was anything 'between' the earth and the moon it would have to be orbiting us so by definition would be a moon not an asteroid 🤗 you could at least try and get your terminology right 🙄 $\endgroup$
    – Pelinore
    Dec 12, 2022 at 6:54

1 Answer 1


This is actually one reason why we are considering landings on the Martian moons Phobos and Deimos. Using the chart below (source), we find the $\Delta v$ budget for Deimos is 5.6 km/s, for Deimos 5.7, versus the Moon at 5.7 (all from low Earth orbit). The Martian moons would thus require nearly identical $\Delta v$ as our own.

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