PEPSSI - Pluto Energetic Particle Spectrometer Science Investigation
PEPSSI (Pluto Energetic Particles Spectrometer Science Investigation) is a hockey-puck-size (7.6cm diameter by 2.5cm thick), time-of-flight (TOF) spectrometer that measures ions and electrons over a broad range of energies and pitch angles. Particle composition and energy spectra are measured for H to Fe from ~15 keV/nucleon to 1 MeV/nucleon and for electrons from 15 keV to 700 keV. The PEPSSI instrument traces its heritage back to the MESSENGER Energetic Particle Sensor (EPS) instrument. EPS/PEPSSI was developed with the support of a NASA Planetary Instrument Definition and Development (PIDDP) grant aimed at designing a low-mass, low-power sensor that can measure energetic pickup ions produced near planets and comets (Andrews et al., 1998; McNutt et al., 1996). The overall PEPSSI instrument weighs 1.5 kg and uses a maximum of 1.4 W of power. in January 2006 as the inaugural mission in NASA's New Frontiers program.
This PEPSSI description was adapted from the New Horizons website, the SOC Instrument ICD, and McNutt et al. (2007).
The PEPSSI Tabs
The tabs associated with this page describe the PEPSSI data files and how to obtain and use them.