Hobby-Eberly Telescopeとは 意味・読み方・使い方

The Hobby-Eberly Telescope is a 9.2-meter (30-foot) aperture telescope located at the McDonald Observatory. It combines a number of features that differentiate it from most telescope designs, resulting in greatly lowered construction costs. For instance, the telescope mirror itself does not move to track the night sky; instead, the instruments at the focus are moved across the face of the unmoving mirror, allowing a single target to be tracked for up to two hours. The primary mirror consists of 91 hexagonal elements, which is less expensive than a single large primary. The telescope is named for former Texas Lieutenant-Governor Bill Hobby and for Robert E. Eberly, a Penn State benefactor. Although the main mirror itself is fixed at 55 degrees angle, the telescope can rotate around its base, and the secondary can move;this allows access to about 70-81% of the sky at its location.