Two images of 2010 ST3 (circled in green) taken by PS1 on the night of September 16 show the asteroid moving against the background field of stars and galaxies. Credit: PS1SC

The University of Hawaii’s Pan-STARRS PS1 telescope on Haleakala has discovered an asteroid that will come within 4 million miles of Earth in mid-October. The object is about 150 feet in diameter and was discovered in images acquired on September 16, when it was about 20 million miles away.

It is the first “potentially hazardous object” (PHO) to be discovered by the Pan-STARRS survey and has been given the designation “2010 ST3.”

“Although this particular object won’t hit Earth in the immediate future, its discovery shows that Pan-STARRS is now the most sensitive system dedicated to discovering potentially dangerous asteroids,” said Dr. Robert Jedicke, a University of Hawaii member of the PS1 Science Consortium (PS1SC), who is working on the asteroid data from the telescope. “This object was discovered when it was too far away to be detected by other asteroid surveys,” Jedicke noted.

Most of the largest PHOs have already been catalogued, but scientists suspect that there are many more under a mile across that have not yet been discovered. These could cause devastation on a regional scale if they ever hit our planet. Such impacts are estimated to occur once every few thousand years.

Objects the size of 2010 ST3 usually break up in Earth’s atmosphere, but the resulting blast wave on the surface can still devastate an area covering hundreds of square miles. “There is a very slight possibility that ST3 will hit Earth in 2098, so it is definitely worth watching,” Jedicke said.

Dr. Timothy Spahr, director of the Minor Planet Center (MPC), said, “I congratulate the Pan-STARRS project on this discovery. It is proof that the PS1 telescope, with its Gigapixel Camera and its sophisticated computerized system for detecting moving objects, is capable of finding potentially dangerous objects that no one else has found.” The MPC, located in Cambridge, Mass., was established by the International Astronomical Union in 1947 to collect and disseminate positional measurements for asteroids and comets, to confirm their discoveries, and to give them preliminary designations.

Pan-STARRS expects to discover tens of thousands of new asteroids every year with sufficient precision to accurately calculate their orbits around the sun. Any sizable object that looks like it may come close to Earth within the next 50 years or so will be labeled “potentially hazardous” and carefully monitored. NASA experts believe that, given several years warning, it should be possible to organize a space mission to deflect any asteroid that is discovered to be on a collision course with Earth.

Pan-STARRS has broader goals as well. PS1 and its bigger brother, PS4, which will be operational later in this decade, are expected to discover a million or more asteroids in total, as well as more distant targets such as variable stars, supernovas, and mysterious bursts from galaxies across more than half the universe.

The PS1 surveys have been made possible through contributions of the PS1 Science Consortium (www.ps1sc.org): the University of Hawaii Institute for Astronomy; the Pan-STARRS Project Office; the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and the Max Planck Institute for Extraterrestrial Physics, Garching; the Johns Hopkins University; Durham University; the University of Edinburgh; the Queen’s University Belfast; the Harvard-Smithsonian Center for Astrophysics; the Las Cumbres Observatory Global Telescope Network, Inc.; and the National Central University of Taiwan. Construction funding for Pan-STARRS (short for Panoramic Survey Telescope & Rapid Response System) has been provided by the U.S. Air Force Research Laboratory.

FIGURE CAPTIONS

Figure 1: Two images of 2010 ST3 (circled in green) taken by PS1 about 15 minutes apart on the night of September 16 show the asteroid moving against the background field of stars and galaxies. Each image is about 100 arc seconds across. Credit: PS1SC.

Figure 2: The PS1 Observatory on Haleakala, Maui just before sunrise. Photo credit: Rob Ratkowski.

Asteroid 2010 ST3 (circled in green) taken by PS1 on the night of September 16 moving against the background field of stars and galaxies. Each image is about 100 arc seconds across. Credit: PS1SC

Founded in 1967, the Institute for Astronomy at the University of Hawaii at Manoa conducts research into galaxies, cosmology, stars, planets, and the sun. Its faculty and staff are also involved in astronomy education, deep space missions, and in the development and management of the observatories on Haleakala and Mauna Kea.

Established in 1907 and fully accredited by the Western Association of Schools and Colleges, the University of Hawaii is the state's sole public system of higher education. The UH System provides an array of undergraduate, graduate, and professional degrees and community programs on 10 campuses and through educational, training, and research centers across the state. UH enrolls more than 50,000 students from Hawaii, the U.S. mainland, and around the world.