what type of mirror do the two Keck twin telescopes have?
- StephenLv 59 years agoFavorite Answer
Each of these telescopes uses a segmented parabolic mirror and a convex hyperbolic secondary in a Cassegrain configuration. The individual segments are aligned continuously (four times per second) to counteract distortions due to gravity and, to a lesser extent, due to atmospheric conditions.
The Keck I mirror was the first to use this segmented, adaptive optics approach, but since then, this has been used in all large visible and near-infrared telescopes. The adjustments are still not fine enough to handle requirements for ultraviolet observations.
- SLv 69 years ago
The Keck mirrors are parabolic surfaces made from 36 thin mirror segments in a honeycomb pattern. Each mirror segment is 1.8 meters wide, 7.5 centimeters thick, and weighs about 400 kg. Each segment is aligned by a computer twice a second.
The mirrors themselves are made from a special glass-ceramic called Zerodur, coated with 120 nanometers of pure aluminum.Source(s): http://www.lbl.gov/Science-Articles/Archive/keck-t... http://en.wikipedia.org/wiki/Zerodur
- llorensLv 44 years ago
Invented? that may not the main excellent be conscious, by using fact the Keck telescopes are rather Newtonian reflectors, invented by utilising Isaac Newton in 1678. in addition they incorporate various different innovations, somewhat utilising 2 telescopes as an interferometer and utilising segmented primaries. the two telescopes have been performed in 1993 and 1996.