<p>It occurred to me that one of the ringed asteroids or minor planets may answer <a href="https://astronomy.stackexchange.com/questions/40820/are-there-any-planetary-ring-system-other-than-phoebe-ring-not-aligned-to-the">this question about the alignment of planetary rings</a>. However, it appears that the rings of <a href="https://en.wikipedia.org/wiki/10199_Chariklo" rel="nofollow noreferrer">Chariklo</a>, <a href="https://en.wikipedia.org/wiki/Haumea#Ring" rel="nofollow noreferrer">Haumea</a> and <a href="https://en.wikipedia.org/wiki/2060_Chiron#Rings" rel="nofollow noreferrer">Chiron</a> (possible rings) are within a few degrees of the plane of rotation of the asteroid.</p>
<p>My thinking was that minor planets with low gravity may be able to capture/maintain moons at a higher orbital inclination than larger planets, and those moons will not be in distant orbits as described <a href="https://en.wikipedia.org/wiki/Orbital_inclination#Natural_and_artificial_satellites" rel="nofollow noreferrer">here</a>.  Satellites could also be formed by collisions and their spin evolution is described <a href="http://wise-obs.tau.ac.il/%7Edavid/OnSpinEvolution.htm" rel="nofollow noreferrer">in this article</a>.  I think there may be an argument that the <a href="https://en.wikipedia.org/wiki/4179_Toutatis#Properties" rel="nofollow noreferrer">YORP effect</a> and other tumbling or precession effects could lead to unusual orbital attitudes for natural satellites perhaps?</p>
<p>There are four hundred and sixteen minor planets that have moons, are any of those moons known to orbit at high inclinations to the plane of rotation of the parent body?</p>

CC BY-SA 4.0
2021-01-13T15:47:42.863Z
This is going to be quite hard to answer as the Axial Tilt is unknown for most of the minor planets.
Connor Garcia
CC BY-SA 4.0
2021-01-14T13:16:58.493Z
@ConnorGarcia  You're right!  I started trawling through the data here: http://www.johnstonsarchive.net/astro/asteroidmoons.html but the orbital inclination is not shown/known for most satellites of minor planets.  I did find a paper at https://www.sciencedirect.com/science/article/abs/pii/S0019103511004532  that is paywalled but the abstract suggests (if I read it correctly) that for the 18 asteroids surveyed, the pole of the binary orbit is within 30 degrees of the pole of the ecliptic.  I'll keep looking.
Dave Gremlin
CC BY-SA 4.0
2021-01-14T16:05:27.397Z
The full text is also publicly available here: https://www.researchgate.net/publication/230558707_Binary_asteroid_population_2_Anisotropic_distribution_of_orbit_poles_of_small_inner_main-belt_binaries
Maybe someone knows of an example offhand.  My intuition is that 1.) non-equatorial orbits are probably not as stable as equatorial orbits due to the equatorial bulge and tidal locking and 2.) Most moon capture and formation models will result in near equatorial moon orbits.
Connor Garcia
CC BY-SA 4.0
2021-01-14T19:46:17.023Z
@ConnorGarcia  That's fantasitc, thanks very much!
Dave Gremlin
<asteroids><orbital-mechanics><natural-satellites>
Are there any moons of minor planets that orbit at high inclination to the plane of rotation of the parent body?
Dave Gremlin
# Are there any moons of minor planets that orbit at high inclination to the plane of rotation of the parent body?

(Asked by: username_0 on 2021-01-13)

It occurred to me that one of the ringed asteroids or minor planets may answer [this question about the alignment of planetary rings](https://astronomy.stackexchange.com/questions/40820/are-there-any-planetary-ring-system-other-than-phoebe-ring-not-aligned-to-the). However, it appears that the rings of [Chariklo](https://en.wikipedia.org/wiki/10199_Chariklo), [Haumea](https://en.wikipedia.org/wiki/Haumea#Ring) and [Chiron](https://en.wikipedia.org/wiki/2060_Chiron#Rings) (possible rings) are within a few degrees of the plane of rotation of the asteroid.

My thinking was that minor planets with low gravity may be able to capture/maintain moons at a higher orbital inclination than larger planets, and those moons will not be in distant orbits as described [here](https://en.wikipedia.org/wiki/Orbital_inclination#Natural_and_artificial_satellites). Satellites could also be formed by collisions and their spin evolution is described [in this article](http://wise-obs.tau.ac.il/%7Edavid/OnSpinEvolution.htm). I think there may be an argument that the [YORP effect](https://en.wikipedia.org/wiki/4179_Toutatis#Properties) and other tumbling or precession effects could lead to unusual orbital attitudes for natural satellites perhaps?

There are four hundred and sixteen minor planets that have moons, are any of those moons known to orbit at high inclinations to the plane of rotation of the parent body?

**Tags:** asteroids, orbital-mechanics, natural-satellites
> **Comments:**
> **username_1**: This is going to be quite hard to answer as the Axial Tilt is unknown for most of the minor planets.  
> **username_0**: @ConnorGarcia  You're right!  I started trawling through the data here: http://www.johnstonsarchive.net/astro/asteroidmoons.html but the orbital inclination is not shown/known for most satellites of minor planets.  I did find a paper at https://www.sciencedirect.com/science/article/abs/pii/S0019103511004532  that is paywalled but the abstract suggests (if I read it correctly) that for the 18 asteroids surveyed, the pole of the binary orbit is within 30 degrees of the pole of the ecliptic.  I'll keep looking.  
> **username_1**: The full text is also publicly available here: https://www.researchgate.net/publication/230558707_Binary_asteroid_population_2_Anisotropic_distribution_of_orbit_poles_of_small_inner_main-belt_binaries Maybe someone knows of an example offhand.  My intuition is that 1.) non-equatorial orbits are probably not as stable as equatorial orbits due to the equatorial bulge and tidal locking and 2.) Most moon capture and formation models will result in near equatorial moon orbits.  
> **username_0**: @ConnorGarcia  That's fantasitc, thanks very much!  

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## 0 answers

