Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/8.0.0/doc/eslewchain/node16.html
Дата изменения: Wed Oct 22 17:11:04 2008
Дата индексирования: Fri Oct 16 23:15:30 2009
Кодировка:
Поисковые слова: jupiter

XMM-Newton Science Analysis System


eslewchain (eslewchain-1.0.1) [???]

Meta Index / Home Page

Comments

• Slews which are very curved can produce exhorbitantly large images which do not maintain the flat projection and hence contain points with increasingly inaccurate astrometry. This happens in about 1% of slews.
• AT points of inflection the interpolation of the curve fails a bit. This produces errors of $<1$ arcmin at the worst.
• NB: The slew images have very few photons (typically about 100 in half a square degree). For reasons which are not fully understood the more recent versions of the source detection chain produce a large number of spurious sources from these images. At the moment it is recommended to use SAS 6.1 to source search slew images.