First see that of the Prigogene Center,
some work on asteroids,
a related factoid;
An interesting book review,
U.S. Naval Observatory’s Astronomical Applications Department,
JPL’s Planetary Ephemerides and explanation,
Miscellaneous trove,
Planetary satellites,
Interactive Almanacs,
mass,
then my beginnings,
and my note on the precession of Mars.
Miscellaneous Planetary Data from NASA.
This (2016 Feb) gives more digits for the Mass.
Even more:
SJSNUEVMMP = 30:19891 27:18986 26:56846 26:10243 25:86810 24:59736 24:48685 23:64185 23:33022 22:125
24:59736 means 5.9735×1024 kg.