Date: 2013-08-01

Kaydon bearing helps astronomers study the stars (pic)

Muskegon, Michigan, USA...How do you collect data from stars thousands of light years away while positioning a 300-ton telescope to within a fraction of a human hair? You use a high-tech spectrometer called MOSFIRE (Multi-Object Spectrometer For Infra-Red Exploration), rotating on a Kaydon bearing.

With MOSFIRE, astronomers can gather spectra at near-infrared wavelengths (invisible to the human eye) and even penetrate cosmic dust clouds to investigate the formation of stars and galaxies. The instrument can survey 46 objects at once and switch targets in minutes, instead of the usual one or two days.

"I reckon that MOSFIRE will observe very faint targets more than a hundred times faster than has ever been possible," said Caltech astronomer Chuck Steidel, its co-principal investigator. "All the observations my group and I have done in near-infrared spectroscopy with Keck over the last 10 years could be done in just one night with MOSFIRE."

MOSFIRE is 25 times more light-sensitive than other instruments of its kind and can observe vastly more cosmic objects on any given night. It arrived in February at the W. M. Keck Observatory in Hawaii and will be fully commissioned in September. The observatory, near the 14,000-foot summit of Mauna Kea, on the island of Hawaii, is a scientific partnership of the California Institute of Technology, the University of California and NASA.

"Our orientation changes constantly as we track the stars, so the bearing must handle many load combinations, both axial and radial," said Mike Pollard, a Keck engineer. "Astronomers with 20-30 years' experience say the Kaydon bearing is the best they've ever seen."

Pollard said the Kaydon bearing was the only one to meet all the requirements, which include:

*smooth performance (very little torque variation)
*mounting to a structure that is slightly compliant (i.e., not stiff)
*very little wobble

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