Subscribe free to our newsletters via your
. 24/7 Space News .

It's a Sim: Out in Deep Space, New Horizons Practices the 2015 Pluto Encounter
by Staff Writers
Laurel MD (SPX) Jun 04, 2012

As the Pluto encounter simulation winds down on May 30, (from left) New Horizons Guidance and Control System Lead Gabe Rogers reviews data with Mission Operations Planner Sarah Hamilton and Mission Operations Manager Alice Bowman in the Mission Operations Center at the Johns Hopkins Applied Physics Laboratory, Laurel, Md.

The science instruments aboard NASA's New Horizons spacecraft were running at full tilt, with cameras snapping images, sensors scanning the space environment and the communications system trading radio signals with ground stations on Earth. No matter that the target of this activity - the Pluto system - was still about three years and 850 million miles away. On May 29-30, New Horizons "thought" it was July 14, 2015, and carried out the most intense segment of its Pluto flyby as part of the mission's first onboard encounter simulation.

The simulation was conducted at a distance of 23 astronomical units from the Sun - 23 times the distance between Earth and the Sun. When the real encounter happens in 2015, Pluto will be 33 AU from the Sun.

The New Horizons team has been "scripting" the Pluto flyby for the past several years, building on the experience and success of the spacecraft's 2007 flight through the Jupiter system. This week marked the first real test of that code on the spacecraft, in an environment New Horizons operators can't fully duplicate on their computers.

Last week, mission operators at the Johns Hopkins Applied Physics Laboratory in Maryland transmitted the 9,675 commands into New Horizons' computers that guide all activities for the very day the spacecraft is closest to Pluto and its moons - about 22 hours of activity in all.

"We're really testing the things we can't simulate on the ground very well, such as the actual slewing - the movement of the spacecraft to point the science instruments - directed by the guidance and control system," says Alice Bowman, New Horizons mission operations manager at APL.

"We'll also look hard at those slews to make sure there was enough time between the end of one observation and the start of another."

The simulation started with a system-health check-in through NASA's Deep Space Network; New Horizons then turned from Earth and toward the spot where it was programmed to find Pluto. A few hours later the spacecraft turned back to Earth, sent a quick burst of housekeeping data to let operators know it was OK, then returned to the encounter.

All told, the script called for 77 separate observations, with as many as four science instruments observing at the same time. The simulation ended just before 2 p.m. EDT on May 30.

With the instruments aiming at empty space where Pluto and its various moons will be on July 14, 2015, the data New Horizons sends back over the next few weeks might have little science value - but from it the team will know whether the sequences went off as planned and the spacecraft pointed in the right directions.

"From what we've already seen, we have a good idea that the spacecraft did what it was supposed to do," Bowman says.

"This first mission sim both retired a lot of risks by showing the actual spacecraft can handle the pace of activity we plan at Pluto, and it prepared the way for a more extensive, nine-day Pluto encounter sim next year," says New Horizons Principal Investigator Alan Stern, of the Southwest Research Institute.

New Horizons is about midway through its annual systems and instrument payload checkout, having been roused from hibernation on April 30.

It's currently humming through space at more than 34,000 miles (nearly 55,000 kilometers) per hour, between the orbits of Uranus and Neptune, about 2 billion miles (3.3 billion kilometers) from Earth. The team will ease New Horizons back into electronic slumber in early July.


Related Links
New Horizons
The million outer planets of a star called Sol

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Beyond Pluto And Exploring the Kuiper Belt
Boulder CO (SPX) May 10, 2012
New Horizons remains healthy and on course, now more than 23 times as far from the Sun as the Earth is. We will be 32.9 times as far from the Sun as the Earth is when we reach Pluto in three years, in the summer of 2015, so we're now about 70 percent of the way there. On April 30, New Horizons exited its most recent hibernation period, which lasted from late January through all of February ... read more

UA Lunar-Mining Team Wins National Contest

NASA Lunar Spacecraft Complete Prime Mission Ahead of Schedule

NASA Offers Guidelines To Protect Historic Sites On The Moon

Neil Armstrong gives rare interview - to accountant

Wind may have driven avalanches on Martian dunes

On The Hunt For Light-Toned Veins Of Gypsum

Mars missions may learn from meteor Down Under

Waking Up with the Sun's Rays

New Moon for India

Boeing Completes Software PDR Of New Crew Ship

NASA hails 'new era' in exploration

CU astronaut-alumnus Scott Carpenter looks back at 50th anniversary of Aurora 7 mission

What will China's Taikonauts do aboard Tiangong 1?

Why is China sending a woman into space?

China launches telecommunication satellite

Tiangong 1 Ready To Meet Shenzhou 9

Capillarity in Space - Then and Now, 1962-2012

Dragon on board

SpaceX Launches Falcon 9 Dragon on Historic Mission

SpaceX Dragon Transports Student Experiments to Space Station

Sea Launch Delivers the Intelsat 19 Spacecraft into Orbit

SpaceX Dragon capsule splash lands in Pacific

US cargo ship on return voyage from space station

US cargo vessel prepares to leave space station

Tiny Planet-Finding Mirrors Borrow from Webb Telescope Playbook

Astronomers Probe 'Evaporating' Planet Around Nearby Star with Hobby-Eberly Telescope

Venus transit may boost hunt for other worlds

NSO To Use Venus Transit To Fine-Tune Search For Other Worlds

Microsoft links Xbox with smartphones, tablets

E3 to showcase big videogame titles, hot trends

Windows 8 to dominate Taiwan computer show

Commonly used painkillers may protect against skin cancer

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement