P stands for periodic, which means the comet takes less than 200 years to complete its orbit. The comet was given the number 13 because it was the 13th periodic comet to be identified.

According to NASA: "Scientists calculate that an average periodic comet lives to complete about 1,000 trips around the Sun. Halley has been in its present orbit for at least 16,000 years ...

Asteroids and comets move in paths which are more oval ... The planet Uranus takes about 84 Earth years (or 30,688 Earth days) to complete one orbit around the Sun. A day on Uranus is 17.25 ...

There are countless numbers of asteroids and an unknown number of comets throughout our solar ... enabled astronomers to better calculate its orbit. In January, the probability of this asteroid ...