  By utilising the inbuilt citation counts from NASA's astrophysics data system
(ADS) I derive how many citations refereed articles receive as a function of
time since publication. After five years, one paper in a hundred has
accumulated 91 or more citations, a figure which rises to 145 citations after
ten years. By adding up the number of citations active researchers have
received over the past five years I have estimated their relative impact upon
the field both for raw citations and citations weighted by the number of
authors per paper.
