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OUTER PLANETS
Capstone: 2015
by Alan Stern, PI New Horizons
Boulder CO (SPX) Apr 21, 2015


Fifty years to the day before we explore Pluto, humankind's first exploration of Mars by a spacecraft took place, with the historic flyby of 14 July 1965 by NASA's Mariner IV. For a larger version of this image please go here.

New Horizons remains healthy and on course for its prime Pluto system science in July! On July 14, New Horizons will make its closest approach to Pluto and its system of moons. In a cosmic coincidence, that will occur 50 years to the day after the historic first flyby of Mars, on July 14, 1965!

It's amazing - in less than one human lifetime, from innermost Mercury to outermost Pluto - all nine classical planets of our solar system will have been explored. Equally amazing, NASA spacecraft have led the way: from the very first such flyby of Venus in 1962, to the New Horizons flyby of Pluto in 2015, NASA has been first to every one of those planets.

Carl Sagan used to say that there would only be one or two generations of humans who would share that special moment in time, who as children know the planets only as points of light but as adults know them all as places, imaged and studied - real worlds that have become part of human experience.

I am proud that the upcoming exploration of the Pluto system in July will be the very capstone to that historic era of exploration, completing the initial reconnaissance of the planets. And I am happy that you will be a part of that capstone moment.

Just last week the mission began what we call Approach Phase 2. Approach Phase 1, which began in January, was primarily designed to obtain navigation images to home in on Pluto, and data on the space environment where Pluto orbits.

Approach Phase 1 concluded April 4, having been performed flawlessly. It included intensive imaging of Pluto and satellites Nix and Charon as dots in the distance to measure their positions against star fields to refine our navigation to Pluto, and the collection of space plasma and dust data to characterize the environment near Pluto.

Approach Phase 2 (AP2), which will last until mid-June, is different. Although we will continue to collect navigation data to home in on Pluto, and environmental data about the space around Pluto, we now turn our attention to the study of the Pluto system itself.

During the next two months, we'll be collecting higher and higher resolution imagery, including both black-and-white and color images, as well as infrared and ultraviolet spectra to learn new things about the composition of Pluto and its moons.

In fact, our highest-resolution imager, LORRI, will begin returning images better than any obtained from Earth or Earth-orbit by mid-May - that's next month! By the end of AP2, these images will have about 10 times as many pixels on Pluto as the best images available today.

Other key events in AP2 include a major test of our radio science experiment, REX, which will probe Pluto's atmosphere and measure its temperature and radar reflectivity in July, and possibly two engine burns to trim our trajectory as we navigate toward our precise aim point near Pluto.

Also in AP2, the mission team will participate in our last two mission simulations: one for hazard avoidance and one for science data processing. And the science team will meet in late May to finalize its plans for approach and encounter.

As the pace of events heats up you'll be seeing more in the way of image and news releases, so stay tuned. In fact, on the afternoon of April 14, NASA will hold a pair of televised events including our team and NASA leadership, so press and public can learn more about our detailed objectives and flyby plans for the exploration of Pluto and its moons. This event will be available live on the Web at www.nasa.gov, and anyone can tune in!

By the time I next write, in May, we'll be deep in Approach Phase 2 and on the verge of the fast-paced, historic events of June and July that will reveal Pluto and its moons "for all mankind."

Well, that's it for now. Until I write again, I hope you'll keep exploring - just as we do.


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Related Links
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OUTER PLANETS
NASA's New Horizons Nears Historic Encounter with Pluto
Laurel MD (SPX) Apr 16, 2015
NASA's New Horizons spacecraft is three months from returning to humanity the first-ever close up images and scientific observations of distant Pluto and its system of large and small moons. "Scientific literature is filled with papers on the characteristics of Pluto and its moons from ground based and Earth orbiting space observations, but we've never studied Pluto up close and personal," ... read more


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