Minor and major planets in the innermost solar system

Minor and major planets in the innermost solar system

Fig. 13.6 . The orbits of the inner major planets are shown as large, light blue circles, for Mercury, Venus, Earth and Mars from the center out. Small red circles indicate the locations of the minor planets coming within 1.3 AU of the Sun at perihelion, where 1.0 AU is the mean distance between the Earth and the Sun. Small filled circles indicate objects observed at more than one opposition. Outline circles indicate objects seen at only one opposition. Numbered periodic comets are shown as filled light-blue squares. Other comets are shown as unfilled light-blue squares. The plot is for the date 20 January 2010. (Courtesy of Gareth Williams, Minor Planet Center.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University