In part, the unit was introduced because at first, the ratios between different distances in the Solar System (such as, how far is each planet from the Sun) were known to a pretty good accuracy (thanks to Kepler's Laws), but the absolute distances themselves (say, in kilometers) were not. Therefore, such distances were expressed in multiples of Earth's distance from the Sun, as a convenient "yardstick". It is still very useful, to help visualize distances within the Solar System.
29 astronomical units = 4,338,338,250 kilometers.
You can use a search engine such as Google or Bing to perform these kinds of unit conversions. Enter "5.2 AU in kilometers" and get the answer5.2 Astronomical Units = 777,909,600 kilometers
Not all magnitudes in nature come in integer units.
It is a very large unit for such scales. Also, it's better to use the standard (i.e., the SI) units, for several reasons.
It is elliptical with a period of 75.3 years and a semimajor axis of 17.8 astronomical units, a little smaller than Uranus's orbit. The eccentricity is 0.967 so that is approaches within 0.586 astronomical units of the Sun, and it is due back on July 28, 2061. It goes out to 35.1 astronomical units, beyond the orbit of Neptune. The inclination of the orbit is 162.3 degrees.
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.
1.93 astronomical units is 288,723,890 kilometers.
0.82 astronomical units is 122,670,254 kilometers.
29 astronomical units = 4,338,338,250 kilometers.
4 astronomical units = 371,822,485 miles
38 astronomical units is about 5,684,719,086 kilometers.
39.5 astronomical units equate to about 5,909,115,892 kilometers.
1 light year = 63,240 Astronomical Units
9.5 Astronomical Units = 1.421181 × 1014 centimeters
1 astronomical unit is approximately 149.6 million kilometers. Therefore, 9.54 astronomical units is roughly 1.43 billion kilometers.
Mars' average distance from the sun is about 1.52 astronomical units (AU), which is approximately 227.9 million kilometers.
Sedna's average distance from the sun is about 86 Astronomical Units.