Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/7.0.0/doc/attbin/node5.html
Дата изменения: Thu Jun 29 00:06:00 2006
Дата индексирования: Sat Dec 22 07:52:18 2007
Кодировка:

XMM-Newton Science Analysis System


attbin (attcalc2-1.2.1) [xmmsas_20060628_1801-7.0.0]

Meta Index / Home Page / Description

Limits on attitude wander

The limits on attitude wander are defined via the parameter maxdelta, which is in arcseconds. The RA limit $\Delta \alpha$ is set to

$$\Delta \alpha = maxdelta / \cos(\delta),$$ (1)

where $\delta$ is the average declination value (the exact meaning of `average' in this context is discussed in section 3.3 below). The declination limit is just set to maxdelta, and the position angle (apos) limit $\Delta p$ is set to

$$\Delta p = maxdelta \times 60 \times 180 / \pi / R_{\rm {arcmin}},$$

where $R_{\rm {arcmin}} = 15.0$ is the nominal radius of the field of view of the XMM EPIC cameras.