Caption: The largest rocky bodies (including the rocky planets) naturally) and rocky-icy bodies in Solar System ranked in order of decreasing diameter.

The rocky-icy bodies do NOT include the Sun and the gas giant planets (i.e., Jupiter ♃, Saturn ♄, Uranus ⛢ or ♅, and Neptune ♆).

Features:

1. The diagram is a bit out of date since it predated the discovery of some of the large trans-Neptunian objects (TNOs) (which include large Kuiper belt objects (KBOs)). So some new large rocky-icy bodies need to be inserted among the smaller displayed rocky-icy bodies.

   Circa 2022, there are ∼ 3900 known TNOs (see Wikipedia: List of trans-Neptunian objects). The count is growing rapidly with automated searches.

2. Currently, the most massive known TNO is Eris which has a diameter of ∼ 2300 km. It is definitely more massive than Pluto, but its diameter is about the same. Thus, Eris and Pluto are nearly tied in ranking by diameter.

3. The Moon's diameter is ∼ 3500 km, and so no known TNO yet changes its place in the ordering at number 9. But the day may come when we find a larger TNO and push the Moon further down the list.

4. The Galilean moons of Jupiter rank high as one can see.

5. Selected rocky bodies and rocky-icy bodies from the diagram with their astronomical symbol if they have one:
   Earth ⊕, Venus ♀, Mars ♂, Ganymede, Titan, Mercury ☿, Callisto, Io, Moon ☽, Europa, Triton, Pluto ♇, Charon 🝑, Ceres .

6. For an up-to-date ranking by diameter of all Solar System astro-bodies, see Wikipedia: List of Solar System objects by size.

Credit/Permission: © David Jeffery, 2004 / Own work.
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