changed apparent magnitude 5.02 to 5.024

http://en.wikipedia.org/wiki/11_UMi_b
Merge pull request #27 from planetaryscience/patch-1

changed apparent magnitude 5.02 to 5.024. Source: http://www.aanda.org/articles/aa/full_html/2009/39/aa11702-09/aa11702-09.html