Josh Butterworth PhD candidate Name Mr. J.J. Butterworth Telephone +31 71 527 5737 E-mail butterworth@strw.leidenuniv.nl PhD candidate Science Sterrewacht Sterrewacht Work address Oort Niels Bohrweg 2 2333 CA Leiden Room number 464 Contact +31 71 527 5737 butterworth@strw.leidenuniv.nl Publications No relevant ancillary activities