WATCH THIS SPACE: We are assembling a large collection of reference documents for Goodman, and will make them available here as they are ready.
The Goodman Spectrograph is an all-transmitting-element, multi-object, imaging spectrograph. It was built for high throughput, especially in the UV, but performs extremely well out to the R band. The maximum resolving power is currently about 10,000. Improvements to the spectrograph are ongoing, so please check these pages for updates.
Efficiency
After the February 2011 servicing run the throughput of Goodman in imaging mode was measured and compared to the Soar Optical Imager. The results are at right and show Goodman has higher imaging throughput in all bands. Spectroscopic throughput is here.
Radial Velocities (stability)
The Goodman Spectrograph is mounted mounted directly at Nasmyth focus, where it rotates through through more than 360 degrees. A 1 ton instrument turning upside down will never have the stability of a bench mounted spectrograph, but with active compensation the measured total flexure is about 1 pixel (15 microns). This is equivalent to hitting a target 1 km distant to within 7 mm. The spectrograph has been used to obtain radial velocities of hot subdwarfs with a precision of ~5 km/sec.
