Physical study of planets and satellites

Review of recent progress made in various aspects of planetary research, followed by some comments on ongoing unpublished research at various centers. The results of planetary atmosphere research are cited for Mercury, Venus, Mars, the Jupiter system, Saturn and Titan (the largest satellite of Saturn), and Uranus and Neptune. Findings regarding planetary surfaces are presented for Mercury, Venus, and Mars. Current unpublished research concerning Venus, the minor planets, Jupiter, and Saturn is reviewed, and work currently being performed at the IAU Planetary Photographic Data Center at Meudon, by the Planetary Research Center at the Lowell Observatory, and within the framework of the International Planetary Patrol Program is evaluated.