Chris L Peterson wrote:

I like your concept. I'd revise it, however.

Formally, a planet is [Mercury, Venus, Earth, Mars, Jupiter, Saturn,
Uranus, Neptune, Pluto]. Informally a planet could also be any generally
spherical, non-fusing body orbiting a star. This term would never be
used in a scientific publication or situation where rigor was required
(unless referring to the nine planets listed above).

A "planetary body" (or invent your own name) is a non-fusing body
orbiting a star . There are many classifications of planetary bodies. I
wouldn't generally classify by mass, as you have, but by composition and
origin. But the classes could be arbitrarily complex and extendible to
deal with new types of bodies, or new understanding of bodies.

Mass tends to be one of the first physical characteristics known about
newly discovered planetary bodies, whether those bodies be in our own
solar system or in orbit around stars other than our sun. IMO any new
classification system ought to be applicable not only to known
planetary bodies within our own solar system, but also to the growing
number of extra-solar discoveries.

Willie R. Meghar