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OUTER PLANETS
New Horizons Team Digs into New Data on Next Flyby Target
by Staff Writers
Washington DC (SPX) Jun 16, 2017


New Horizons has two more chances to observe stellar occultations of MU69 this summer, on July 10 and July 17.

It was the most technically-challenging and complex stellar occultation observation campaign ever attempted: At least 54 observing teams with dozens of telescopes dispatched across two continents, positioned to catch a rare, two-second glimpse of a small, distant Kuiper Belt object passing in front of a star. And it wasn't just any KBO - it was the next flyby target of NASA's New Horizons mission.

Overnight on June 2-3, about two-dozen members of the New Horizons team and other observers in Argentina and South Africa were hoping to capture the fleeting starlit shadow of 2014 MU69, which the New Horizons spacecraft will explore in a flyby on New Year's Day 2019.

"The stars aligned for this observing campaign, which was implemented expertly by the team," said New Horizons Program Executive Adriana Ocampo at NASA Headquarters in Washington, D.C.

"It's amazing how classical astronomy - from small telescopes to some of the most advanced observatories on Earth - is helping New Horizons plan its next flyby, and it shows how truly global space exploration is."

All 54 telescope teams collected data, reported mission Principal Investigator Alan Stern, adding that team scientists started digging into that data when they returned home last week.

"A tremendous amount had to go right to correctly execute such a massive observation campaign, but it did," said Stern, of the Southwest Research Institute (SwRI) in Boulder, Colorado.

"The main goal of these observations was to search for hazards; the secondary objective was to try to glimpse the occultation of MU69 itself, in order to learn its precise size. Scouring all the dozens of datasets for these two objectives is going to take us a few weeks."

Near-Perfect Positioning
Marc Buie, the New Horizons SwRI co-investigator who led the campaign, stressed that data from the European Space Agency's Gaia mission and the Hubble Space Telescope were critical to planning the observations. "Without Gaia and Hubble, I doubt we could have succeeded so well at this," Stern agreed, "Gaia and Hubble were crucial to this success and we thank them both."

Combining Gaia star positions with Hubble images provided the information needed to predict the narrow path of MU69's shadow across Earth. "The Gaia star data has been critical this entire operation," Buie said. "Without it, there was no way we could have predicted such an accurate path."

Observing by Air and Land
New Horizons has two more chances to observe stellar occultations of MU69 this summer, on July 10 and July 17. On July 10 the team will employ the powerful 100-inch (2.5-meter) telescope on NASA's airborne Stratospheric Observatory for Infrared Astronomy (SOFIA); the plane's vantage point from above the clouds will remove bad weather as an observation obstacle, and SOFIA should be able to provide better data than the smaller telescopes used in the occultation just completed.

Airborne, SOFIA will provide the best vantage point to observe the July 10 occultation since the shadow falls in the middle of the Pacific Ocean.

On July 17, New Horizons team members will redeploy with two-dozen small mobile telescopes (40 centimeters in diameter) to far southern lands in Patagonia, Argentina to observe the third and final event, which offers a much brighter star to probe even more deeply for debris around MU69.

OUTER PLANETS
New Horizons Deploys Global Team for Rare Look at Next Flyby Target
Laurel MD (SPX) May 26, 2017
On New Year's Day 2019, more than 4 billion miles from home, NASA's New Horizons spacecraft will race past a small Kuiper Belt object known as 2014 MU69 - making this rocky remnant of planetary formation the farthest object ever encountered by any spacecraft. But over the next six weeks, the New Horizons mission team gets an "MU69" preview of sorts - and a chance to gather some critical en ... read more

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