2.3.1 spase://SMWG/Observatory/MESSENGER MESSENGER Mercury Surface, Space Environment, Geochemistry and Ranging 2020-04-05T12:34:56.789Z The Mercury Surface, Space Environment, Geochemistry and Ranging, MESSENGER, mission, launched on 2004-08-03, was mainly designed to study the characteristics and environment of Mercury from orbit. After an Earth flyby July-August of 2005, Venus flybys October-November of 2006, and May-June of 2007, and Mercury flybys December 2007-January 2008, September-October of 2008, and September-October of 2009, MESSENGER entered Mercury orbit on March 4, 2011. Much data of interest to the heliospheric community was obtained during the cruise phases between planetary encounters from a magnetometer and an energetic particle and plasma spectrometer. Please acknowledge the National Aeronautics and Space Administration, NASA spase://SMWG/Person/Ralph.L.McNutt.Jr ProjectScientist spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact NSSDC Master Catalog https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2004-030A Information about the MESSENGER spacecraft and the overall mission en Mercury Earth.Magnetosphere Heliosphere.Inner Heliosphere.NearEarth Heliosphere.Remote1AU Venus 2004-08-03T06:15:56Z 2015-04-30T19:26:00Z The listed start date corresponds to the launch time of MESSENGER