Discovery Channel Telescope » Instruments » RIMAS

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

S106

An infrared image of the star forming region S106 taken with the Subaru telescope. RIMAS will explore the infrared universe with the DCT. (Subaru 8.3-m Telescope, National Astronomical Observatory of Japan)

The Rapid infrared IMAger Spectrometer (RIMAS)

This infrared instrument combines imaging and spectroscopic capabilities in one compact setup that will be mounted on one of the ports of the DCT instrument cube.

RIMAS will be able to image objects in the infrared part of the spectrum, just as LMI does in the optical, though with a smaller field of view. The spectroscopic capabilities will include both a very low resolution mode as well as a higher resolution mode, complementing the capabilities of NIHTS and allowing researchers to conduct a diverse set of projects using it.

The instrument is being built by the Goddard Space Flight Center in partnership with the Astronomy Department of the University of Maryland at College Park. UMD and GSFC have joined Lowell as partners in the DCT, and RIMAS is expected to be commissioned later in 2012.

Full technical details for RIMAS are available here.