If gravity is required, what are the planets in the SolarSystem?

"Rodney Kelp" wrote in message
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I thought it had to do with orbit. If it orbits a sun, it's a
planet. If it
orbits a planet it's a moon. Large elliptical orbits by tiny
objects don't
count as planets. Comets and asteroids can't have moons because of
insufficient mass, therefore can't be planets.

What about 243 Ida's moon, Dactyl?
http://www.solarviews.com/eng/ida.htm

Is 243 Ida therefore a planet?

Another line of reasoning might be that what we call it is what it
is.

Sure. The bodies in question don't care.

You could have a planet floating around in deep space that has
escaped it's
sun or the sun burnt out. A lost planet? A rogue moon?

Or an asteroid or a comet?

-- Best regards,
Matt Funke