The answer depends on what the ordinality is based on:
distance from the sun/orbital period
distance from the earth
brightness in our night sky
size/mass
number of moons
when discovered
when visited (fly past) by a spacecraft
Each one of these will probably generate a different ordinal number.
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"sixteenth" is an ordinal number. There is no ordinal number for an ordinal number!
The ordinal number of 43 is 43rd and the ordinal word is forty-third.
The ordinal number of 22 is 22nd and the ordinal word is twenty-second.
The ordinal number for 100 is hundredth.
fifth is an ordinal number!!!!