Companion to comet Grigg-Skjellerup discovered using Giotto data?
Energetic particle signature recorded by the EPONA instrument on board Giotto in the energy range ~ 60-100 keV. The data are believed to represent the signature of a companion to Comet Grigg-Skjellerup. Particle count rate is shown on the vertical axis. Time and distance from the comet are shown on the bottom scale. (Courtesy Susan McKenna-Lawlor)