Prospects for detecting other planetary systems

Prospects for the detection of extrasolar planetary systems using ground and space-based techniques are surveyed. The likely observable manifestations of another planetary system are considered, including angular displacements in stellar position, Doppler shifts in stellar radiation and stellar dimming due to the transit of an unseen companion (indirect techniques), and direct evidence of the thermal and reflected components of planetary radiation. The current status and prospects for future improvement of ground-based detection based on astrometric and radial velocity measurements are reviewed, and the limitations of future space-based systems that may be used in astrometric or direct searches for other planetary systems, the IRAS and the Space Telescope, are discussed. It is concluded that a comprehensive search program must involve both ground- and space-based instruments.