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Elachi Makes Statement on Terrorist Attacks September 14, 2001 I n s i d e Volume 31 Number 18 News Briefs . 2 Farewell, Larry . 3 Special Events Calendar . 2 Silver Snoopys . .4 Ulysses Sees A Windy Sun . .2 Letters, Classifieds . 4 Jet Propulsion Laboratory JPL opened for business on Thursday, Sept. 13, two days all who work here. People from around the world, from different back- after the tragic terrorist attacks on the United States grounds, religions, and ethnicities have come to our Laboratory, bring- ing with them their special talents and creativity. Let us make sure that on Sept. 11. In the wake of those events, JPL Director one of our responses is to remember to respect all who work here.” Elachi Dr. Charles Elachi expressed to Lab employees his “deep Elachi reminded JPLers who are troubled or grieving, or need assis- concern for the victims of (the) terrorist acts. Our thoughts tance for whatever reason, to call the Lab’s Employee Assistance makes Program at ext. 4-3680. and prayers go out to those who have lost their lives, to the injured, Elachi also reassured JPL staff that the Lab is responding to this to all of the families and loved ones, and to all who are struggling so tragedy by “redoubling our commitment to safety. Our security and statement valiantly in rescue efforts.” facilities people have done an excellent job to secure and protect the The director addressed a number of concerns that have arisen from Laboratory and its people. Please know that with all that is being done, Tuesday’s events. your safety and that of the public is foremost in our minds,” he said. on terrorist As of Wednesday, he said, “we know of no JPL employee who was Because of heightened security, there will be “necessary changes traveling on any of Tuesday’s four airline flights that met such tragic regarding access and package and vehicle inspections,” Elachi said. endings. However, this hope- “I urge you to stagger your arrival times between the hours of 6 and attacks ful news is tempered by the 9 a.m. for the rest of this week [through Sept. 14] or until further knowledge that with such notice is given. Please be certain to wear your JPL badge above the massive casualties on the waistline. I expect nothing less than your full cooperation with all of East Coast, some of us at these requirements in the days ahead.” JPL may have lost friends Also, due to heightened security for travelers, Elachi directed that no or loved ones on the planes work-related air travel from the Los Angeles region be undertaken by or the buildings that were any JPL employee prior to Tuesday, Sept. 18. “As for those who are The American flag flies at destroyed. currently away from the Lab, we are asking you to use your best judg- “We cannot undo what ment based upon your individual circumstances regarding either return- half-staff at JPL ’s entrance in happened on Tuesday, but it ing or staying,” the director said. “Either way, I do not wish you to feel honor of the victims of the is in our power to decide how under any work pressure to make an uncomfortable decision.” He urged we respond today and in the those with questions or concerns to contact their immediate supervisor. terrorist attacks of Sept. 11. days ahead,” Elachi added. Elachi also reminded staff that the most immediate information will “Out of this tragedy we can be available via JPL’s internal communications web site, The Daily re-dedicate ourselves to the Planet, at http://dailyplanet, and that Labwide e-mails and brief Labwide principles and values that voice mail messages will be sent out as required. make us proud to be Ameri- Those who do not have remote access to the Laboratory network at cans and proud to work at home were urged to contact the “State of the Lab” recordings at (800) institutions like JPL and 303-4575 and (818) 354-8601. In the event of major breaking news, NASA. One of those values is notices may also be posted on JPL’s external home page at respect for diversity and for www.jpl.nasa.gov. s OLAR SYSTEM JPL’s Deep Space 1 spacecraft, famed for Bo r re l l y ’ s surface and to measure and identify rescue. They reconfigured the spacecraft to use bringing science fiction’s ion engine technology the gases coming from the comet. The space- the photographic camera to orient itself by the to life, is preparing to fly daringly close to a craft will also attempt to measure the interac- stars around it. Deep Space 1 comet on Saturday, Sept. 22. At 3:30 p.m. tion of solar wind with the comet, a process In order to take pictures of Borrelly, the Pacific Daylight Time that day, Deep Space 1 that leads to formation of the beautiful tail. camera cannot align the spacecraft and snap to earn will attempt to pass inside the unknown envi- Borrelly makes a good target for study now, photos of the comet at the same time. Instead, ronment just 2,000 kilometers (about 1,200 as it is just 1.34 astronomical units (about the spacecraft will have to rely on its fiber- miles) from the nucleus of comet Borrelly. The 200 million kilometers or 125 million miles) optic gyroscopes to help maintain its orienta- extra credit spacecraft may tell us more about comets and from the Sun—the closest it will get for anoth- tion. But the gyros are not accurate enough by their place in the solar system. The robotic er seven years. The Sun’s heat will make the themselves, so engineers designed complex at comet explorer will attempt to investigate the comet’s gases escaping from the nucleus flow faster new software to try to correct for those inaccu- environment when it tries to fly right through and thicker, so they will be easier to study. The racies. The software is designed to help the the cloud of gas and dust surrounding the icy nucleus and the spacecraft will flash past camera stay pointed at the comet’s nucleus By Martha Heil comet’s nucleus, known as the coma. each other at 16.5 kilometers per second during the critical few minutes that the probe “Deep Space 1 is like a slugger trying to pile (more than 36,900 miles per hour). will be close enough to the nucleus to try to get up extra home runs after breaking the world The flight team is also wondering whether a view of it. record,” said Project Manager Dr. Marc Ray- Deep Space 1 will have enough gas to get to The ion and electron monitors, together man. “Its mission to test new technologies is the comet. The long-lived spacecraft keeps known as the plasma experiment for planetary already highly successful. It has been a tremen- itself pointed correctly by firing small thrusters exploration, will attempt to identify the compo- dously rewarding effort for the small Deep of hydrazine gas. When the hydrazine runs out, sition of the coma and measure the comet’s Space 1 team to keep this aged and wounded Deep Space 1 will be unable to keep itself interaction with the solar wind. Deep Space 1 bird aloft. Any science we get at the comet will pointed correctly and the spacecraft will die. will also strive to make infrared measurements be a terrific bonus.” The flight team has an estimate of how much of the nucleus. Its spectrometer breaks light By the time of the flyby the spacecraft will gas is left, but a few hours’ worth of gas could into its individual colors, similar to looking have completed three times its intended life- make all the difference in the comet encounter. through a prism. The spectrometer on Deep time in space, and the risks involved in gather- As it approaches the center of the coma, the Space 1 works in the infrared, and the result- ing science data are very high, so results of spacecraft will face its greatest challenge: to ing data allow scientists to determine, among this latest venture are unpredictable. obtain pictures and infrared measurements of other things, the chemical composition of the Artist’s rendering of the The spacecraft will be traveling through a the nucleus. Deep Space 1 can’t tell exactly object in view. Deep Space 1 spacecraft. cloud of gas, dust and comet pieces to collect where the nucleus is or what it will look like. Deep Space 1, launched in October 1998, its data. Since Deep Space 1 wasn’t built to go The craft will have to locate the nucleus on its completed its primary mission to test ion to a comet, it does not carry a protective own and try to point the camera toward it as it propulsion and 11 other high-risk, advanced shield. “We expect to be hit by debris from the streaks by. technologies in September 1999. NASA extend- comet, and at 16.5 kilometers per second In late 1999, after the successful end of its ed the mission, taking advantage of the ion (36,900 mph), even a tiny particle might prove primary mission, Deep Space 1 lost its star propulsion and other systems to target a fatal,” said Rayman. “But this is an adventure tracker, which helps determine the spacecraft’s chancy but exciting encounter with Borrelly. too exciting to pass up.” orientation. Faced with what could have been a More information is online at http://nmp.jpl.
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