A year is a unit of time. An astronomical unit is a unit of distance. The two units are therefore incompatible.
1 light year = 63,240 Astronomical Units
Light years and astronomical units are both units of distance.
Mercury--0.387 astronomical units Venus--0.723 astronomical units Earth--1.0 astronomical units Mars--1.524 astronomical units Jupiter--5.203 astronomical units Saturn--9.529 astronomical units Uranus--19.19 astronomical units Neptune--30.06 astronomical units Pluto--39.53 astronomical units Please note that these are all mean distances, and the actual distance will vary as to the location of the specific planet in its specific orbit.
Units such as light years and astronomical units are useful because they can be used to measure very large distances without yielding extremely large numbers.
Astronomical Units, parsecs, light years, take your pick.
You can use Kepler's 3rd law: the period is 19.2^1.5 which is 84 years. I guess you know which planet that is (I saw it with binoculars last year).
1.93 astronomical units is 288,723,890 kilometers.
0.82 astronomical units is 122,670,254 kilometers.
4 astronomical units = 371,822,485 miles
38 astronomical units is about 5,684,719,086 kilometers.
29 astronomical units = 4,338,338,250 kilometers.
1.38