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Snapshot: News-Sentinel readers rate their vacations Celebrating 40 years with underwater whale sounds, colorful sunsets, reefs

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Posted: Friday, March 8, 2013 7:22 am

Who went: John and Peggy Nunes.

The trip: We celebrated 40 years of marriage in Maui, Hawaii. We went snorkeling in several popular areas on the western coast of Maui with underwater sounds of the whales. The beautiful color of all the fish among the colorful coral reefs while swimming with huge sea turtles was amazing. Then, we finished each day with a Hawaiian sunset and sky filled with rainbows, which sure made a great celebration for our anniversary. We were truly blessed.

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The European Space Agency announced Monday it had selected Site J on Comet 67P/Churyumov-Gerasimenko as the target landing spot for the Rosetta mission’s Philae lander.

The selection of the site brings the Rosetta team one step closer to being the first to land a spacecraft directly on the surface of a speeding comet.

The site is not ideal, according to the team of scientists and engineers on the Landing Site Selection Group. However, after a meeting at CNES (the French space agency) in Toulouse, France, over the weekend, they decided unanimously that Site J is their best option.

“None of the candidate landing sites met all the operational criteria at the 100 percent level, but Site J is clearly the best solution,” said Stephen Ulamec, Philae lander manager, at the DLR German Aerospace Center in a statement.

Comet 67P/Churyumov-Gerasimenko is a rubber-duck shaped body about 2.5 miles across at its longest point. Rosetta spent the last 10 years looping around the solar system before it finally met up with the comet on Aug. 6.

Rosetta will continue to tag along with the comet over the next year as it zips closer to the sun, but to help scientists get a close look at the comet’s icy nucleus, Rosetta will send a small lander down to the comet’s surface.

Since August the spacecraft has zoomed closer and closer to the comet, eventually coming within 19 miles of it. At that distance, it can see that Comet 67P is a topographically dramatic world, with steep slopes and deep crevices. That makes for pretty pictures, but is not great for finding landing sites. Part of the appeal of Site J, therefore, lies in its relatively shallow slopes, that should reduce Philae’s chance of toppling over as it lands on the surface.

There are other benefits to the site as well, scientists say. Site J appears to be mostly boulder-free, and it gets enough daily light to allow the lander to recharge its batteries. It will also provide a relatively straightforward trajectory for landing. The Landing Site Selection Group expects it will take the Philae lander about seven hours to descend to the site.

“ ‘J’ isn’t perfect, but overall it just rates better than the other candidate sites,” said Joel Parker, deputy principal investigator for one of Rosetta’s suite of instruments.

The lander itself is just 30 inches high and 3 feet across, but it is equipped with 10 instruments to help scientists better understand the composition of a comet’s nucleus, and how it changes as it nears the sun.

To help Philae stick to the comet, which has very little gravity, the lander will drill into the surface with ice screws almost as soon as it lands. It also has a harpoon system that will shoot into the ground.

Philae is currently scheduled to land on Comet 67P on Nov. 11. Between now and then, the Landing Site Selection Group will be busy analyzing the site for boulder distribution and to make the final call.

“We cannot predict the activity of the comet between now and landing, and on landing day itself,” ESA Rosetta flight director Andrea Accomazzo said in a statement. “A sudden increase in activity could affect the position of Rosetta in its orbit at the moment of deployment and in the exact location where Philae will land, and that’s what makes this a risky operation.”

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©2014 Los Angeles Times

Visit the Los Angeles Times at www.latimes.com

Distributed by MCT Information Services

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GRAPHIC (from MCT Graphics, 312-222-4194): 20140916 Rosetta lander

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Topics: t000003087,t000026905,t000026911

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