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: http://www.stsci.edu/documents/dhb/web/c14_fgsdataanal.fm.html
Дата изменения: Tue Nov 18 00:20:20 1997 Дата индексирования: Sat Dec 22 16:12:44 2007 Кодировка: |
Observers can analyze FGS astrometry data at various levels. Individual observations can be of interest when a particular star shows large, unexpected residuals. More frequently observers will be constructing plate overlays from sets of POSITION mode observations to determine parallaxes, proper motions, and reflex motions. Alternatively, analysis of TRANSFER mode observations can reveal an object's spatial structure at milliarcsecond scales. This chapter discusses the tools that will soon become publicly available to support these diverse astrometric investigations with the FGS.