Uranus and Ariel - 2006 - Annotated
The semi-major axis of Uranus's orbit about the sun is 19.18 Astronomical Units (A.U.) or roughly 2.9 billion km.
Uranus (without rings) has a diameter of roughly 32,000 miles (51,000 km) at the equator.
This image was created from HST data from the following proposal 10805: PI: L. Sromovsky (University of Wisconsin, Madison), H. Hammel (Space Science Institute), and K. Rages (SETI Institute).
FR782N at 750nm, 770 nm, and 790 nm
This image is a composite of many separate exposures made by the ACS instrument on the Hubble Space Telescope. A single ramp filter was used to sample several wavelength ranges. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:
Blue: FR782N (750 nm )
Green: FR782N (770 nm)
Red: FR782N (790 nm)