Discovery Channel Telescope » Instruments » LMI

DCT Status, 29 Feb 2012

Construction complete

On January 20, 2012, the DCT's secondary mirror was successfully mounted in its support cell at the top of the telescope truss and on February 7, our engineers installed the instrument cube on the back of the primary mirror cell. These were the final major components of the telescope to be installed. This essentially marked the completion of construction.

We are therefore now fully into the commissioning phase of the DCT project. On February 24, we began observations using one of the guider probe cameras, formerly used at the DCT's prime focus in a test camera to examine the performance of the primary mirror and active optics but now mounted in their proper home in the instrument cube. Early results suggest the full Ritchey-Chretien system is working extremely well. The team is satisfied with the alignment of the telescope and has reached image quality of 1 arc second. We soon will be employing the active optics system to fine-tune the image quality.

Large Monolithic Imager

With the instrument cube (which includes the guider and wavefront sensor) now complete, our shop has turned its full attention to completing the Large Monolithic Imager (LMI). The LMI, funded by a grant from the National Science Foundation, will be the DCT's workhorse instrument, featuring a 36 megapixel CCD with a field of view of nearly 13 arc minutes. When complete, the LMI will be mounted on the back of the instrument cube, at the straight-through position, with other instruments eventually arrayed around the side ports.

First Light

At this time, we remain on schedule for first light in May 2012. The Discovery Channel plans to air its first major feature on the DCT in June 2012.

For Astronomers: Technical information

Spectrum of Arcturus

Spectrographs like the DeVeny disperse light into its component wavelengths, allowing detailed analysis of celestial objects. Shown is the spectrum of Arcturus (Nigel A. Sharp, NOAO/AURA/NSF).

The DeVeny Spectrograph

Currently in use at the 1.8-meter Perkins Telescope at Anderson Mesa, the DeVeny allows spectroscopic observations in visible light. It covers the spectrum from near-ultraviolet to near-infrared light at a variety of resolutions. Formerly in service at Kitt Peak National Observatory, it is now on indefinite loan to Lowell and enjoys regular usage.