Precovery

In astronomy, precovery (short for "pre-discovery recovery") is the process of finding the image of an object in old archived images or photographic plates for the purpose of calculating a more accurate orbit. This happens most often with minor planets, but sometimes a comet, a dwarf planet, a natural satellite, or a star is found in old archived images; even exoplanet precovery observations have been obtained. While the term "precovery" refers to a pre-discovery image, "recovery" refers to imaging of a body which was lost to our view (as behind the Sun), but is now visible again (also see Lost minor planets and Lost comets).

单词	Precovery
释义	Precovery 原声例句少儿百科之歌 In 1951 Precovery pictures saw me before. 1951 年就已经拍到了我的珍藏照片。英语百科 Precovery In astronomy, precovery (short for "pre-discovery recovery") is the process of finding the image of an object in old archived images or photographic plates for the purpose of calculating a more accurate orbit. This happens most often with minor planets, but sometimes a comet, a dwarf planet, a natural satellite, or a star is found in old archived images; even exoplanet precovery observations have been obtained. While the term "precovery" refers to a pre-discovery image, "recovery" refers to imaging of a body which was lost to our view (as behind the Sun), but is now visible again (also see Lost minor planets and Lost comets).
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