Hecho general: 99343 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 99343 is an uninteresting number.
Trivia: 99343 is an unremarkable number.
Fecha histórica: December 28th is the day in 1612 that Galileo Galilei becomes the first astronomer to observe the planet Neptune, although he mistakenly catalogued it as a fixed star.