Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/precise/Midas_doc/doc/95NOV/vol2/node552.html
Дата изменения: Fri Feb 23 12:58:57 1996
Дата индексирования: Tue Oct 2 18:12:42 2012
Кодировка:
Telescope obstruction data



next up previous contents
Next: Instrumental data Up: Introduction Previous: Observatory data

Telescope obstruction data

Nearly every telescope seems to have some parts of the sky that are inaccessible. Trees, mountains, and even other telescopes obscure some areas above the horizon. Furthermore, many telescopes have peculiar mountings or other mechanical limitations on where they may look. In a surprising number of cases, the inaccessible regions extend into the parts of the sky one would normally use to measure extinction stars. Such restrictions should be placed in a separate ``obstruction'' table for each telescope.



Rein Warmels
Mon Jan 22 15:08:15 MET 1996