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Asteroids

Ceres, Pallas, Juno and Vesta: the four largest, fetched separately.

The four large asteroids

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Why they stand apart

These four are not in the DE421 ephemeris. They are fetched from JPL Horizons, a network call that costs time -- measured at about 0.6 seconds per body. So they sit beside the thirteen rather than among them: your chart need not wait for them.

What happens when JPL does not answer

Then that body shows 'not fetched'. A layer without Vesta is better than an error where three positions could have stood -- but which one is missing should be visible.

Where they are

Between Mars and Jupiter. Ceres is the largest and has counted as a dwarf planet since 2006 -- the same category as Pluto.