2.639 pc to au conversion result above is displayed in three different forms: as a decimal (which could be rounded), in scientific notation (scientific form, standard index form or standard form in the United Kingdom) and as a fraction (exact result). Every display form has its own advantages and in different situations particular form is more convenient than another. For example usage of scientific notation when working with big numbers is recommended due to easier reading and comprehension. Usage of fractions is recommended when more precision is needed.
If we want to calculate how many Astronomical Units are 2.639 Parsecs we have to multiply 2.639 by 2062648062471 and divide the product by 10000000. So for 2.639 we have: (2.639 × 2062648062471) ÷ 10000000 = 5443328236861 ÷ 10000000 = 544332.8236861 Astronomical Units
So finally 2.639 pc = 544332.8236861 au
