SP-345 Evolution of the Solar
FIGURE 4.3.4.- The (M, a) diagram (mass of
asteroids in g per 0.01 AU as a function of semimajor axis a in AU).
To stress the logarithmic scale, the region of greatest mass density
is shaded. These regions contain practically all the mass in the
asteroid belt. Mass was calculated from magnitude using eq. (4.3.3).
The diagram includes data for all asteroids of a < 5.0 AU listed
in the Ephemerides of Minor Planets for 1968. The resonances are
indicated as the ratio of the orbital period of a body at a specific
value of a to the orbital period of Jupiter. The Kirkwood gaps
correspond to the 1/3, 2/5, 3/7, and 1/2 resonances. (From
Alfvén et al, 1974.)
- Back -