Observations of Comet Hale-Bopp from La Silla

The image displays Hale-Bopp gas production curves (quantity of released gas as a function of heliocentric distance) from radio observations at the IRAM, JCMT, CSO, SEST and Nan��ay telescopes. Pre-perihelion data are shown on the left, post-perihelion data on the right. Adapted from a figure prepared by Nicolas Biver.