A New Look for the Dome

A New Look for the Dome

April 12, 2022 - The Rubin Observatory dome has a new look, after the team from EIE and the Chilean contractor SyR applied natural mill-finished aluminum sheeting to the dome’s exterior over the last several months. No longer white, the dome’s snazzy reflective surface appears silver, or sometimes blue as it reflects the sky.

Although it looks great, Rubin’s shiny dome isn’t a cosmetic decision—many studies have shown that a reflective surface is more observing-friendly than a white coating for nighttime astronomical observatories. White surfaces are better at reflecting heat during the day, but at night they can radiate their heat away and "super-cool," causing thermal turbulance just like a surface that is very hot does. If you’ve ever seen the air shimmer above a road on a hot day, you can imagine how this convective turbulence above the observatory would blur images taken by the telescope.

Reflective surfaces, by comparison, are relatively efficient at reflecting heat during the day but they don’t cool off as much when temperatures drop at night. The reflective finish on Rubin’s dome means less thermally turbulent air above the dome when night falls. The more steps we can take to reduce temperature differences between the ambient air and outside surface of the dome, the crisper Rubin Observatory images will be.

Check out the before and after photos above to see how different the dome looks with its new finish!

Financial support for Rubin Observatory comes from the National Science Foundation (NSF) through Cooperative Support Agreement No. 1202910, the Department of Energy (DOE) Office of Science under Contract No. DE-AC02-76SF00515, and private funding raised by the LSST Corporation. The NSF-funded Rubin Observatory Project Office for construction was established as an operating center under management of the Association of Universities for Research in Astronomy (AURA).  The DOE-funded effort to build the the Rubin Observatory LSST Camera (LSSTCam) is managed by the SLAC National Accelerator Laboratory (SLAC).
The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 to promote the progress of science. NSF supports basic research and people to create knowledge that transforms the future.
NSF and DOE will continue to support Rubin Observatory in its Operations phase. They will also provide support for scientific research with LSST data.   

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