Dear DiRAC supporters,

Welcome to 2025 and to a new installment of our newsletter.

And what a year it’s been so far! In October of last year, after almost two decades of research, development, and construction, we welcomed the first engineering light with the test camera at the Rubin Observatory. The first image, unveiled at the January American Astronomical Society’s meeting by Rubin Construction director and UW DiRAC Faculty Prof. Zeljko Ivezic, shows the potential of the observatory and foreshadows the next decade of discovery. We’re now working towards the first light with Rubin’s main camera, and marching towards the end of this year when Rubin will embark on its 10 year mission to map the Universe in both space and time.

Read more about Rubin, events at the Institute, profiles of our excellent DiRAC team members, as well as how our Prof. Nora Shipp won a Scialog Collaborative Innovation Award, in the main part of this newsletter.

But before I let you go, there’s one more thing… Following nearly five years of being at the helm of DiRAC, it’s a privilege to welcome Prof. Jim Davenport as the new incoming Director! Jim is Research Associate Professor in the department of Astronomy, and has been DiRAC’s Associate Director for nearly all of my tenure. His impact on the institute cannot be underestimated: from revitalizing our time-domain program to leading numerous outreach and education initiatives — including the highly successful DiRAC Undergraduate Summer Prize program.

As I prepare to take a Rubin-focused sabbatical next year, I’m incredibly grateful to Jim for agreeing to step up and take on this responsibility. As we finally enter the age of Rubin, there’s no one better I can imagine to lift the Institute to new heights!

Onwards and upwards,

Mario Jurić
DiRAC Director
Professor, Department of Astronomy

Rubin Observatory Construction will be completed in about half a year: LSST will start before the end of 2025!

Many major milestones were accomplished in 2024, with first on-sky images obtained with an engineering camera demonstrating that the Simony Survey Telescope (SST) is operational. In early March, the main LSST camera was attached to the telescope and we anticipate the first on-sky images, the so-called First Photon milestone, in April.

Going back to the accomplishments from 2024, the primary/tertiary mirror (M1M3) for SST was coated with a layer of silver in April 2024 and thus prepared for final integration with the rest of the telescope.  The last major piece of equipment, the LSST Camera, was shipped from SLAC to Chile in May 2024. The successful transport of the camera and supporting equipment and tools, (3 large containers and 47 crates) to Chile, first by Boeing 747 plane from San Francisco to Santiago and then by 9 trucks to the Observatory, was a major step towards the completion of the Rubin Observatory. 

Rubin’s Simony Survey Telescope was fully integrated for the first time in early October 2024, with all three mirrors and an engineering (commissioning) camera installed. After 10 years of intensive construction of the Rubin Observatory, and 20 years since the project began, the first images of the night sky were obtained with engineering camera on October 24, 2024! In parallel with hardware integration and commissioning, software pipelines are being completed and tested using extant and Rubin Auxiliary Telescope data, as well as these commissioning image data. In particular, the Rubin group at DiRAC is leading the Alert Pipeline testing and commissioning. 

After using this telescope configuration to image the sky until mid-December 2024, the Rubin team removed the 144-megapixel engineering camera and installed the final science component: the car-sized 3,200-megapixel LSST camera. We except the very first on-sky images with the LSST Camera in April, the first science quality images by early summer, the completion of the construction project by the end of September, and the start of 10-year Legacy Survey of Space and Time before the end of 2025.

As Rubin Observatory Construction is nearing its completion, the Rubin Operations Team is preparing for the start of LSST and relentless sky surveying, while several thousand members of eight Rubin Science Collaborations are finalizing their preparations and tools for data analysis. DiRAC’s members are playing a major role in these preparations and positioning themselves to partake in the rich harvest of science results to be soon enabled by LSST data!

Prof. Željko Ivezić

Director of Rubin Construction

Professor of Astronomy, University of Washington

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By Suberlak, Crenshaw, Kalmbach, Connolly

The Vera Rubin Observatory recently completed an extensive testing run using its engineering test camera (ComCam), marking a significant milestone toward full operations. Beginning as a dream in 1998, and under construction since 2015, this exciting moment marks the first time Rubin has observed the night sky. This crucial seven-week testing phase, which ran from late October to mid-December 2024, utilized ComCam—a smaller version containing just nine of the 189 CCD sensors that will be present in the final 3.2-gigapixel LSST Camera.

Members of the DiRAC Institute—Andrew Connolly, John Franklin Crenshaw, Bryce Kalmbach, and Chris Suberlak—played a central role in the testing, working on-site in Chile throughout the session. Their work focused primarily on Rubin’s Active Optics System (AOS), which maintains optimal image quality across the telescope’s 9.6 deg² field of view by analyzing wavefront sensor data in real-time, calculating necessary adjustments, and controlling the positioning actuators on the primary and secondary mirrors despite environmental challenges like temperature fluctuations and mechanical stress. Successful operation of this complex system is necessary for Rubin to achieve its lofty science goals.

“35 out of the 52 nights of the engineering run featured at least one of the DiRAC team members on the summit. During one of the observing nights, Suberlak gave a quick online tour of the summit control room, answering questions via livestream for DiRAC guests gathered at the UW Planetarium. Much of the night’s work focused on implementing and testing new control software settings and evaluating how pipeline improvements affected image quality. These tests required close collaboration between AOS test scientists, observing specialists, and other team members, who provided rapid feedback to debug software and hardware issues.

No two nights felt dull or repetitive. One evening, a series of images revealed an unusual light pattern—something the team had never seen before. After two trips to the telescope dome, they discovered the culprit: a light source beneath the main 8.2 m mirror (M1/M3) had been left on due to a low-level software bug. On another occasion, thick clouds covered nearly the entire sky, and the weather forecast predicted slim chances of capturing useful images. Yet, as the night progressed, the sky unexpectedly cleared. Not only did the team manage
to take images, but the quality exceeded expectations—better than on many other nights—thanks in part to the AOS feedback loop.

We eagerly anticipate what the commissioning of the LSST Camera (LsstCam) will bring!

Nora Shipp, UW assistant professor of astronomy, was part of one of eight interdisciplinary teams awarded the Collaborative Innovation Award in the first year of Scialog: Early Science with the LSST.

This initiative, launched by the Research Corporation for Science Advancement, is a three-year program designed to support early-career scientists as they prepare to utilize data from the upcoming Legacy Survey of Space and Time, or LSST, at the Vera C. Rubin Observatory in Chile.

“Scialog has been a great opportunity to make connections with scientists across the field of astronomy to brainstorm new ideas for taking advantage of the unprecedented data that will soon be provided by the LLST ,” said Shipp.

Shipp’s proposal brings together researchers to study stars and dark matter — not just in the Milky Way, but also in smaller galaxies. By using the LSST to reveal the faint outer regions of these galaxies, the research will help us to better understand the universe’s creation and the limits of how galaxies form.

Scialog, which is short for “science + dialog, “is a collaborative program launched by RCSA in 2010. It’s designed to accelerate breakthroughs by fostering a network of creative scientists across disciplines and encouraging intensive discussions on scientific themes of global importance.

As part of this initiative, the conference brought together an expert group of scientists and facilitators, including Eric Bellm, research assocaite professor of astronomy and   DiRAC Institute Fellow, to guide the discussions.

By Victoria T. Tyron, University of Washington

On March 9th, a group of astronomers from the University of Washington’s DiRAC Institute met in downtown Seattle to share their knowledge and excitement for the future of discovery at Emerald City Comic Con (ECCC). For the last two years, James Davenport (Astronomy professor and DiRAC Director) has convened these “Interstellar Insights” discussion panels of astronomers at ECCC. These outreach events help scientists connect directly with enthusiastic members of the public, reaching folks of all ages!

This year our panel focused on the Vera C. Rubin Observatory, a remarkable facility that will go online in a few months, and that members of UW Astronomy and DiRAC have been helping build for the last 2 decades. Rubin will “bring the night sky to life” with a powerful 10-year survey of the sky, tracking everything from asteroids in our solar system to supernova at the edge of the cosmos. Our panel shared the challenge and opportunity for bringing this amazing machine online and making discoveries across the cosmos in real time.

These expert panels draw crowds of over 100 people, and we receive thoughtful questions from adults and children alike. One fun item we shared this year was a new full-scale build of the Rubin Observatory in Minecraft, allowing anyone to take a virtual tour of this amazing event from the comfort of their living room! (You can download this build and tour it yourself!)

We hope to continue these events around Seattle and the Pacific Northwest for many years, sharing the wonder of the Universe with everyone, as Rubin Observatory goes online and beyond!

At DiRAC Institute, we are fortunate to have a talented group of astronomers whose work is expanding our understanding of the universe. From exploring the outer solar system and developing algorithms for asteroid impact prevention to advocating for cleaner skies and advancing the search for asteroids, their research is making significant contributions to the field of astronomy. We’re excited to share a glimpse into their work and the unique projects they’re leading, brought to you by the dedicated team of journalists from the UW News Lab: Amelia Kim, Dany Villarreal, Cassie Diamond, Pei Xu and Cameron Delfin.

Here are a few profiles of our researchers, showcasing their areas of expertise and contributions to the field.

Click on the links to read their stories.

Sarah Greenstreet’s Journey in Making New Discoveries with the Rubin Observatory

Joachim Moeyens: UW Researcher’s Algorithm Enables Asteroid Impact Prevention

Astronomer Ari Heinze and the Search for Asteroids

Meredith L. Rawls: Research Scientist for Vera C. Rubin Observatory Fighting for Cleaner Skies

Pedro Bernardinelli Explores the Outer Solar System at the Rubin Observatory in Search of New Discoveries

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