As JWST reaches its destination at the end of January, UCF Planetary Scientist Noemi Pinilla-Alonso prepares to complete more than 100 hours of research once it arrives. More info here.
An international team of astronomers (that includes an AO researcher) has announced the results of a comprehensive search for ripples in the fabric of space-time: gravitational waves. More info here.
Dr. Phil Metzger at FSI is profiled in an installment of UCF’s “Knights Do That” series. More info here.
NASA’s Double Asteroid Redirect Test mission — DART — launched last week, and Arecibo Observatory and UCF Planetary Sciences Group are part of the story. More info here.
Prof. Humberto Campins has won a fellowship to spend the next year advising the U.S. Dept. of State. More info here.
Planetary scientists at the Florida Space Institute are featured in the UCF Office of Research annual report. More info here.
There’s so much space-related activity at UCF, we can’t fit it into just one UN-designated week! More info at UCF Today.
Several planetary science researchers in Physics and in FSI have ongoing projects that will help us keep exploring the Moon. More info at UCF Today.
Planetary Science graduate student Autumn Shackelford talks about her research studying airless bodies in the Solar System. More info at UCF Today.
Professor Dan Britt is part of NASA mission that just launched this month that will explore Trojan Asteroids in the outer Solar System. More info at UCF Today.
“UCF planetary physicist Philip Metzger has been crowned one of space engineering’s rock stars by the American Society of Civil Engineers.” Read the whole story at UCF Today. Congrats to Dr. Metzger!
Our own Dan Britt has been named a Pegasus Professor! Congratulations! Story: https://today.ucf.edu/founders-day-honors-professors-commitment-to-students/ .
In the early morning hours of January 21, 2017, many professional and amateur astronomers were pointing their telescopes to a star in the constellation Boötes (The Herdsman) with the unwieldy name of URAT1 533-182543, a typical star that had not inspired any special interest up until that very moment. So what happened on that day to place the star in the spotlight? For about 2 minutes, that star was occulted by Haumea, one of the largest icy bodies in the Solar System orbiting beyond Neptune, and a so-called “dwarf planet,” like Pluto.
Occultations have been used for decades to study details of many small bodies in the Solar System. Conceptually, they are just like total solar eclipses, when lucky witnesses on Earth see the Moon temporarily blot out the entire Sun. In that case, the observers are in the deepest part of the Moon’s shadow. In an occultation, instead of the Moon, there is an asteroid or other object, and instead of the Sun, there is a distant star. These occultations usually last just a few seconds or minutes, and so require careful planning to actually see. Most often, occultations are used to independently find the sizes and shapes of asteroids, properties that can be very difficult to determine otherwise. This is especially true with the very distant objects beyond Neptune, known as “trans-Neptunian objects,” or TNOs. Haumea, in addition to being a dwarf planet, is one of these TNOs.
Twelve telescopes at 10 different observatories around Europe managed to witness Haumea’s blockage of the star. But in addition to measuring Haumea’s properties, the observers saw something unexpected: Haumea has a ring! The discovery of the first ring system around a dwarf planet is a reminder that there are many fascinating worlds to explore in the outskirts of the Solar System.
Estela Fernández-Valenzuela, soon to be a post-doctoral researcher at the Florida Space Institute at UCF, participated in the Haumea occultation project and is a coauthor of this discovery.
“I worked in the planning of the observational campaign. A few days in advance of the phenomenon, we predicted that the shadow of this occultation was going to cross Europe, so we sent out an announcement and coordinated the observations. After the successful detection, I worked on modeling the effects that the ring has on the variation of Haumea’s brightness. This information is needed to determine the orientation of the rotation axis of the body.”
The group of researchers, led by José Luis Ortiz from the Instituto de Astrofísica de Andalucía, Spain, found that Haumea’s ring lies in the same plane as its equator and as the orbit of its outer moon, Hi’iaka. The ring has a radius of about 2,287 kilometers and a width of 70 km, lying at about 1,000 km from Haumea’s surface. They also found that Haumea is larger than previously estimated – its largest axis is about 2300 km long – and this implies that it is not as reflective or as dense as originally thought.
More details can be found in the Nature publication: “The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation,” Nature 550, 219–223 (URL: http://www.nature.com/nature/journal/v550/n7675/full/nature24051.html?foxtrotcallback=true). A video with an artist’s conception of the Haumea system is also available (URL: https://youtu.be/TeUegAEbGxo).
This past summer, for the first time since 1918, people in the United States were able to experience a total solar eclipse that crossed the mainland from coast to coast. No total solar eclipse had even touched the continental United States since 1979, and we will have to wait until April 2024 for the next one. On August 21, 2017, the path of totality extended from Oregon to South Carolina. As you might expect of planetary scientists and astronomers, many UCF researchers from the Florida Space Institute and the Physics Department traveled around the USA to enjoy this rare spectacle. Read about some of their experiences at FSI’s website (URL https://fsi.ucf.edu/solar-eclipse-map/).