MESSENGER Magnetometer and Ephemeris data are taken from the PDS (Planetary Data System),
site.
Datasets available :
Venus_Flyby : 2007-06-04T00:01:37.122 to 2007-06-07T00:01:29.269
Flyby_1 : Mercury flyby : 2008-01-12T00:00:23.906 to 2008-01-17T00:01:42.891
Flyby_2 : Mercury flyby : 2008-10-04T00:00:04.409 to 2008-10-09T00:00:33.468
Flyby_3 : Mercury flyby : 2009-09-27T00:00:58.328 to 2009-10-02T00:01:19.789.
Missing data from 2009-09-29T21:48:36.728 to 2009-10-01T17:14:29.616.
Orbit : Mercury orbit : 2011-03-31T00:00:08.889 to 2011-05-18T00:00:09.777
Coordinates :
VSO : Venus solar orbital coordinates - X directed from the center of the planet toward the Sun, Z is normal to the Venus orbital plane and positive toward the north celestial pole, Y is positive in the direction opposite to orbital motion.
MSO : Mercury solar orbital coordinates - In this coordinate system, the +X-axis points toward the Sun, +Z points northward perpendicular to Mercury's orbit plane, and Y completes the right hand system nominally directed opposite Mercury's orbital velocity around the Sun.
MBF : Mercury body fixed coordinates - The MBF coordinate system is defined by the planetocentric position, Cartesian X, Y, Z coordinates related to the planetocentric distance, latitude measured positive northward from the equator, and longitude measured positive eastward from the prime meridian.
RTN : Radial-Tangential-Normal coordinates - R point from Sun center to the spacecraft, T is formed by the cross product of the solar rotatio axis and R and lies in the solar equatorial plane, N is formed by the cross product of R and T and is the projection of the solar rotational axis on the plane of the sky.