Official Definition of Satellite? So I had an argument with a friend, which was about whether the Moon is a planet or a satellite.

IAU 2006 Resolution B5 gives definitions on what it is to be a planet, but there is a vagueness, as I perceived, is that it does not define satellites, while using it to define dwarf planets.

There is a supplementary Q&amp;A sheet, and it uses the barycenter to define a satellite, but it is implied, not explicitly defined.

My questions follow:


Should the supplementary Q&amp;A sheet considered as legitimate official definitions, or should it be considered as a one way of interpreting the Resolution B5?
If Q&amp;A is legitimate, then why is the definition of the satellite is not included in the Resolution B5? If not, is the official definition of the satellite nonexistent currently?
Are there any source or archive of the official or widely accepted definitions of glossaries in the fields of astronomy?
In fact there is no official definition of a satellite.

Issac Asimov makes a good argument that the Moon is a planet since its orbit is convex around the Sun for its entire orbit, unlike the other moons of the solar system which are concave when in opposition and convex (to the Sun) when in conjunction.

Additionally, the idea that a body is a satellite of another body based on the barycenter being inside one body is flawed. Consider moving the Moon further or closer from/to the Earth. In which direction would you move it to make the two a "binary system" as opposed to a primary/moon system. In fact, though naively one would consider two closer bodies to be a binary system, moving the Moon closer puts the barycenter closer to the center of the Earth. Yet moving the moon further away moves the barycenter outside the Earth. Would you consider the Earth/Moon system as a binary system if the Moon were 30% further from the Earth?

Thus, we see that all proposed definitions for a satellite are flawed and have corner cases which make a precise definition contentious. This is the same problem as we had when trying to define a planet. No definition will nicely fit all the corner cases that Nature will give us.

Note that this answer was translated into English by my father, who is the one typing it. I'm eight years old and don't use SE unsupervised. A good portion of this information I learned just now because of this question, so thank you to the OP.