siderostat

(sid -ĕ-rŏ-stat) A flat mirror that is driven in such a way as to reflect light or infrared radiation from a celestial body to a fixed point, such as a spectrograph slit at the coudé focus of a telescope, over the duration of an observation. A siderostat is often installed outside the main dome of an observatory and can be used with a coudé spectrograph, say, at the same time as the main telescope is being used to study a different field of view. Siderostats often have computer-driven altazimuth mountings.

Siderostat

an auxiliary astronomical instrument whose principal component is a plane mirror. The mirror moves in such a way that it reflects the light rays from a heavenly body in a fixed direction, in spite of the apparent diurnal rotation of the celestial sphere. A siderostat is used to direct the rays of a heavenly body into a fixed telescope. The mirror of the siderostat rotates around two mutually perpendicular axes. A siderostat used to observe the sun is called a heliostat. A primitive form of siderostat was used as early as the 17th century. In the 18th century the use of a clockwork mechanism was introduced for the rotation of the mirror.

siderostat

[′sid·ə·rə‚stat] (optics) A more precise model of a heliostat; the siderostat uses a modified mirror mounting so that the image of a star is kept steady while the rest of the field is in rotation about the center.

单词	siderostat
释义	siderostat siderostat (ˈsaɪdərəʊˌstæt) n (Astronomy) an astronomical instrument consisting essentially of a plane mirror driven about two axes so that light from a celestial body, esp the sun, is reflected along a constant direction for a long period of time. See also heliostat Compare coelostat[C19: from sidero-, from Latin sidus a star + -stat, on the model of heliostat] ˌsideroˈstatic adj Translations sidérostat siderostat siderostat (sid -ĕ-rŏ-stat) A flat mirror that is driven in such a way as to reflect light or infrared radiation from a celestial body to a fixed point, such as a spectrograph slit at the coudé focus of a telescope, over the duration of an observation. A siderostat is often installed outside the main dome of an observatory and can be used with a coudé spectrograph, say, at the same time as the main telescope is being used to study a different field of view. Siderostats often have computer-driven altazimuth mountings. Siderostat an auxiliary astronomical instrument whose principal component is a plane mirror. The mirror moves in such a way that it reflects the light rays from a heavenly body in a fixed direction, in spite of the apparent diurnal rotation of the celestial sphere. A siderostat is used to direct the rays of a heavenly body into a fixed telescope. The mirror of the siderostat rotates around two mutually perpendicular axes. A siderostat used to observe the sun is called a heliostat. A primitive form of siderostat was used as early as the 17th century. In the 18th century the use of a clockwork mechanism was introduced for the rotation of the mirror. siderostat [′sid·ə·rə‚stat] (optics) A more precise model of a heliostat; the siderostat uses a modified mirror mounting so that the image of a star is kept steady while the rest of the field is in rotation about the center.
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