I think this would be more readable if instead of specifying `sr` you directly pass ``radius=0.5 \\* u.degree as keyword argument. So:  ``` >>> async_search = conesearch.AsyncConeSearch(c, radius=0.5 * u.degree,                          catalog_db='The PMM USNO-A1.0 Catalogue (Monet 1997) 1') ``` 