NASA SP.

alignment analysis angstroms aperture applied arc second array astronomical axis beam beryllium calibration Cer-Vit chamber collimator command configuration curve dark current detector developed diameter dynamic electron elements energy environment equipment experiment package facility film filter flux frequency function gimbal heat pipes inches infrared input instrument irradiance Kitt Peak layer lens light load material measurements ment microns mission mode module mounted nanoamperes Observatory obtained operation optical orbit Orbiting Astronomical Observatory p-n junction percent performance photocathode plate Plumbicon primary mirror problem protons pumps radiation ratio reflectance resolution scanning SEC camera tube SEC target secondary mirror sensor shown in figure signal simulation solar spacecraft spectral stability star tracker station stresses structure surface tape techniques temperature thermal thickness tion torque transmission ultraviolet vacuum vehicle vibration vidicon voltage wavelength