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Tuesday, October 9, 2018

DAY IN REVIEW

 

DAY IN REVIEW
NASA JPL latest news release
Painting Cars for Mars

When John Campanella's friend wanted his beloved Ferrari painted, he knew exactly who to call. After all, Campanella had been painting, pinstriping and even airbrushing flames on to cars, motorcycles, airplanes, 18-wheelers and guitars in his spare time for decades.

But that's not why the Ferrari driver came to Campanella. He turned to him because John Campanella has been painting spacecraft for NASA's Jet Propulsion Laboratory in Pasadena, California, for over two decades. And if Campanella's work is good enough for the final frontier, his friend thought, it would be good enough for his black prancing stallion.

"We do a thousand different paint jobs a year at JPL, from components as small as a pill to entire spacecraft fuselages," said Campanella. "I have worked on the first Mars rover Pathfinder, the Deep Impact mission, GRAIL, Juno and Cassini, and I think my paint is just about everywhere in the solar system. We just finished off the Mars 2020 chassis. And like just about everything else we work on, there is only one Mars 2020 rover. We had to get everything as close to perfect as we can get it."

While there are thousands of steps that could be chosen to start a story about producing an SUV-sized, nuclear-powered six-wheel-drive vehicle for the Red Planet, we will begin ours four-and-a-half months before Campanella and his colleagues trained their highly-trained paint guns on the rover.

In mid-April 2018, more than 20 freshly-machined, large, shiny chunks of 7050 and 7075 aluminum that would make up the primary structure of the chassis were collected in a clean room in Building 18 at JPL, along with about a hundred smaller secondary parts. Over the following four-and-a-half months, Mars 2020 engineers and technicians planned, measured, examined, consulted, drilled and fastened until those many parts became a single Mars rover chassis.

"The plan called for 610 rivets, 730 washers, 644 nuts and 964 mechanical fasteners to hold the rover chassis together," said Stephen Pakbaz, lead engineer for the Mars 2020 chassis assembly. "That means there are well over 1,000 holes in the Mars 2020 rover. But in almost all cases we don't just drill once for each hole; we drill three or more times -- entirely by hand."

Each hole in Mars 2020's chassis began its life as a hand-drilled pilot hole. Next, a larger bit is introduced to expand the hole slightly. Then a final drilling of the same hole takes place.

"We drill holes in steps because it gives us the best chance to catch any errors, stresses the metal less, and the increments make it easier to drill by hand," said Pakbaz. "It's detailed work and at times can be tedious, but everyone knows what is at stake."

Prep Work

At the end of 5,000 engineering hours of assembly, involving more than 3,000 drillings and well beyond a thousand rivet and fastener applications, the rover's chassis was complete. But it still was not ready for the paint guns of Campanella's team. There are locations on the rover's chassis where paint is strictly verboten -- places where electronics boxes have yet to be bolted on, wiring harnesses are still to be run and attachment points for hypersensitive science instruments that require bare metal surfaces to perform their best.

"Any good paint job is preceded by a great tape job," said Campanella. "I wouldn't freestyle flames on a Camaro, and we sure don't freestyle Mars rovers."

So on Aug. 1, 2018, the drills and rivet guns in Building 18 Room 102 vanished from sight, and in their place materialized metal stencils, tape measurers and roll upon roll of masking tape.

"You can find the masking tape we used on 2020 in just about any hardware store," said Ryan van Schilifgaarde, a support engineer for Mars 2020 assembly. "But whereas you would probably tear off a strip with your hands and eyeball it onto the wall you wanted to paint in your house, we use a computer-controlled cutter to make sure each piece is exactly the size and shape we want it to be."

Numbering more than 600, the pieces of masking tape for the rover came in all shapes and sizes. Many were smaller than a coin, but a few were about the size of a bagel, and one (covering where fiber optic cable channel will go) was shaped like a serpent and as large as a microwave oven. All were applied by hand and smoothed out to prevent bubbling.

"One hundred and thirty-five temporary sheet-metal stencils also were applied during this time," said van Schilifgaarde. "They mask larger locations on the rover that require a more rigid cover during this part of the build."

The masking team measured success by the millimeter, and more than one application of masking tape had to be recut and reapplied after a visit from Quality Assurance. But with five Mars 2020 engineers logging 500 hours over seven days, the task was finally complete. On Aug. 6, 2018, the Mars 2020 rover chassis -- festooned with metal overlays and masking tape, and then covered in sterile antistatic wrap -- was gingerly forklifted 150 yards from Building 18 to JPL's paint shop.

"With any spacecraft, after you get the static wrap off and inspect the rover, you start with surface prep -- abrading the surface with sand paper so the paint will adhere better," said Campanella. "To prevent any chance of corrosion or oxidation, the rule is, once you start sanding, you have six hours to complete everything -- sanding, priming and painting."

As spacecraft paint jobs go, the Mars 2020 rover was big, and occupied much of the paint room. Because of the rover's size, Campanella worked with just two other people from his six-person team: Patrick Esquivias and their assistant Eddie Castro. Up until two years ago Esquivias had been an aircraft mechanic. This was his first rover. Up until eight months ago, Castro painted houses. This was his 12th spacecraft.

The small team took on the rover in stages. They painted the top deck first, then let things cure for a day before tackling the sides. Another day off and they finished with the front and back. Even with the job spread out, sanding and meticulously cleaning the results of said sanding ate up over two of the six available hours.

But time constraints are just part of the paint job for Campanella's team. Whether it's an Earth orbiter, Mars lander or something destined for the outer planets, standardization, fastidiousness and a steady hand are always the order of the day.

"You can't think about where it's going or how much history it can make," said Campanella. "We use the same paint guns on the same setting and fire them from the same distance and move at the same speed each and every time."

The primer and paint used on Mars 2020 are far from hardware-store variety. Along with being able to adhere to aluminum, they have been proven through rigorous testing to be able to endure the jolts, vibrations, UV rays and other indignities of a trip to Mars, as well as be hearty enough to survive the Martian cold -- all the while not outgassing organic compounds and other materials that could affect the mission's science experiments.

In less than 10 minutes, all the gleaming aluminum and beige masking tape disappeared under Esquivias' steady hand. But before the first layer of flat white had a chance to dry, Esquivias made his way back to the starting point to apply a second coat -- the still-tacky first coat helping make a stronger bond between layers. Then the process was repeated a third and final time.

Less than five hours in, the first painting session on the Mars 2020 rover chassis drew to a close.

Esquivias had been aiming to coat the chassis in a blanket of paint between 4 and 6 mils (or thousandths of an inch) thick. But he would not know until later the next day how they did because the test equipment that Quality Assurance uses to evaluate paint application must come into contact with the painted chassis to provide an accurate readout. And nobody wants to ruin a good paint job.

Even before Quality Assurance could weigh in, Campanella declared Esquivias' first rover a success. "We paint every day, and when we are not painting we are practicing. He nailed it."

The next day, Quality Assurance confirmed that Esquivias had nailed it.

Ready to Bake

On Aug. 14, the Mars 2020 rover chassis was again carefully sheathed in antistatic wrap and transported "up the hill" to Building 144, where it would be baked in a vacuum chamber.

"Cooking the chassis at 230°F (110°C) in a vacuum for three days not only hardens the paint, it literally bakes out contaminants from the paint that could possibly outgas in flight," said Pakbaz. "Since Mars 2020 is an astrobiology mission, ensuring Mars samples have not been contaminated is paramount. Baking the rover goes a long way to making that possible."

On Monday, Aug. 20, the rover chassis came out of the oven. After inspection, it was again covered in sterile, antistatic film and returned to the clean room in Building 18 for some final touches and inspections. About two weeks later, on Sept. 5, a forklift gently carried the assembled, painted and baked chassis at no more than 3 mph back down the hill, a half-mile to JPL's Spacecraft Assembly Facility High Bay 1, where it took its place next to the cruise and descent stages tasked with getting the rover safely to Mars.

A few days after the chassis arrived, John Campanella appeared in the gallery overlooking the high bay. With him were Esquivias and Castro.

"When we are in the paint room, it is all about business," said Campanella. "But now that our job is done, I wanted to make sure they took a moment to let it sink in that they are part of a dedicated team of professionals working on a historic mission of exploration."

"It may not have flames or racing stripes," he added, "but it still looks beautiful."

Mars 2020 will launch from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida and is expected to reach Mars in February 2021.

The Mars 2020 project at JPL in Pasadena, California, manages rover development for the Science Mission Directorate at NASA Headquarters in Washington. NASA's Launch Services Program, based at the agency's Kennedy Space Center in Florida, is responsible for launch management.

For more information about NASA's Mars missions, go to:

https://www.nasa.gov/mars

 

Monday, October 8, 2018

DAY IN REVIEW

 

DAY IN REVIEW
NASA JPL latest news release
NASA Study Connects Southern California, Mexico Faults

A multiyear study has uncovered evidence that a 21-mile-long (34-kilometer-long) section of a fault links known, longer faults in southern California and northern Mexico into a much longer continuous system. The entire system is at least 217 miles (350 kilometers) long.

Knowing how faults are connected helps scientists understand how stress transfers between faults. Ultimately, this helps researchers understand whether an earthquake on one section of a fault would rupture multiple fault sections, resulting in a much larger earthquake.

A team led by scientist Andrea Donnellan of NASA's Jet Propulsion Laboratory in Pasadena, California, recognized that the south end of California's Elsinore fault is linked to the north end of the Laguna Salada fault system, just north of the international border with Mexico. The short length of the connecting fault segment, which they call the Ocotillo section, is consistent with an immature fault zone that is still developing, where repeated earthquakes have not yet created a smoother, single fault instead of several strands.

The Ocotillo section was the site of a magnitude 5.7 aftershock that ruptured on a 5-mile-long (8-kilometer-long) fault buried under the California desert two months after the 2010 El Mayor-Cucapah earthquake in Baja California, Mexico. The magnitude 7.2 earthquake caused severe damage in the Mexican city of Mexicali and was felt throughout Southern California. It and its aftershocks caused dozens of faults in the region -- including many not previously identified -- to move.

Seismic activity in the region is a sign of its complex geology. The Pacific and North American plates are grinding past each other in Southern California. In the Gulf of California, there's a spreading zone where plates are moving apart. "The plate boundary is still sorting itself out," Donnellan said.

Donnellan's team has been studying this region since 2009, using data from NASA's Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR). This sophisticated airborne instrument measures the ground level with extreme accuracy, allowing scientists to see how the ground has shifted between flights. The team also uses data from GPS stations in the region, which provide information on vertical motion of the ground. The study included team members from JPL, the University of California's Irvine and Davis campuses, and Indiana University.

In the new study, Donnellan's team was also able to better define where Earth's crust continued slipping or deforming following the El Mayor-Cucapah earthquake and where other factors are important. "The shaking is only part of the earthquake process," she said. "The Earth keeps on moving for years [after the shaking stops]. What's cool about UAVSAR and GPS is that you can see the rest of the process."

 

Friday, October 5, 2018

DAY IN REVIEW

 

DAY IN REVIEW
NASA Voyager 2 Could Be Nearing Interstellar Space
NASA's Voyager 2 probe, currently on a journey toward interstellar space, has detected an increase in cosmic rays that originate outside our solar system.
› Read the full story
NASA's ARIA Maps Indonesia Quake, Tsunami Damage
NASA's ARIA team produced a new map of damage caused by the 7.5-magnitude earthquake and tsunami in Indonesia.
› Read the full story

 

Thursday, October 4, 2018

Groundbreaking Science Emerges from Ultra-Close Orbits of Saturn

 

DAY IN REVIEW
NASA JPL latest news release
Groundbreaking Science Emerges from Ultra-Close Orbits of Saturn

New research emerging from the final orbits of NASA's Cassini spacecraft represents a huge leap forward in our understanding of the Saturn system -- especially the mysterious, never-before-explored region between the planet and its rings. Some preconceived ideas are turning out to be wrong while new questions are being raised.

Six teams of researchers are publishing their work Oct. 5 in the journal Science, based on findings from Cassini's Grand Finale. That's when, as the spacecraft was running out of fuel, the mission team steered Cassini spectacularly close to Saturn in 22 orbits before deliberately vaporizing it in a final plunge into the atmosphere in September 2017.

Knowing Cassini's days were numbered, its mission team went for gold. The spacecraft flew where it was never designed to fly. For the first time, it probed Saturn's magnetized environment, flew through icy, rocky ring particles and sniffed the atmosphere in the 1,200-mile-wide (2,000-kilometer-wide) gap between the rings and the cloud tops. Not only did the flight path push the spacecraft to its limits, the new findings illustrate how powerful and agile the instruments were.

Many more Grand Finale science results are to come, but here are some of today's highlights:

  • Complex organic compounds embedded in water nanograins rain down from Saturn's rings into its upper atmosphere. Scientists saw water and silicates, but they were surprised to see also methane, ammonia, carbon monoxide, nitrogen and carbon dioxide. The composition of the organics is different from that found on moon Enceladus -- and also different from that on moon Titan, meaning there are at least three distinct reservoirs of organic molecules in the Saturn system.
  • For the first time, Cassini saw up close how rings interact with the planet and observed inner-ring particles and gases falling directly into the atmosphere. Some particles take on electric charges and spiral along magnetic-field lines, falling into Saturn at higher latitudes -- a phenomenon known as "ring rain." But scientists were surprised to see that others are dragged quickly into Saturn at the equator. And it's all falling out of the rings faster than scientists thought -- as much as 22,000 pounds (10,000 kilograms) of material per second.
  • Scientists were surprised to see what the material looks like in the gap between the rings and Saturn's atmosphere. They knew that the particles throughout the rings ranged from large to small. But the sampling in the gap showed mostly tiny, nanometer-sized particles, like smoke, suggesting that some yet-unknown process is grinding up particles.
  • Saturn and its rings are even more interconnected than scientists thought. Cassini revealed a previously unknown electric-current system that connects the rings to the top of Saturn's atmosphere.
  • Scientists discovered a new radiation belt around Saturn, close to the planet and composed of energetic particles. They found that while the belt actually intersects with the innermost ring, the ring is so tenuous that it doesn't block the belt from forming.
  • Unlike every other planet with a magnetic field in our Solar System, Saturn's magnetic field is almost completely aligned with its spin axis. The new data shows a magnetic-field tilt of less than 0.0095 degrees. (Earth's magnetic field is tilted 11 degrees from its spin axis.) According to everything scientists know about how planetary magnetic fields are generated, Saturn should not have one. It's a mystery that physicists will be working to solve.
  • Cassini flew above Saturn's magnetic poles, directly sampling regions where radio emissions are generated. The findings more than doubled the number of direct measurements of radio sources from the planet, one of the few non-terrestrial locations where scientists have been able to study a radio-generation mechanism that is believed to operate throughout the universe.

For the Cassini mission, the science rolling out from Grand Finale orbits more than justifies the calculated risk of diving into the gap -- skimming the upper atmosphere and skirting the edge of the inner rings, said Cassini Project Scientist Linda Spilker.

"Almost everything going on in that region turned out to be a surprise," Spilker said. "That was the importance of going there, to explore a place we'd never been before. And the expedition really paid off -- the data is tremendously exciting."

Analysis of Cassini data from the spacecraft's instruments will be ongoing for years to come, helping to paint a clearer picture of Saturn.

"Many mysteries remain, as we put together pieces of the puzzle," Spilker said. "Results from Cassini's final orbits turned out to be more interesting than we could have imagined."

The papers published in Science are:

On Oct. 4, as the Science publication embargo lifts, articles describing research complementary to these findings will post online in Geophysical Research Letters (GRL), a journal of the American Geophysical Union (AGU).

The Cassini-Huygens mission is a cooperative project of NASA, ESA (European Space Agency) and the Italian Space Agency. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, manages the mission for NASA's Science Mission Directorate in Washington. JPL designed, developed and assembled the Cassini orbiter. The radar instrument was built by JPL and the Italian Space Agency, working with team members from the U.S. and several European countries.

For more information about Cassini, go to:

https://www.nasa.gov/cassini

https://saturn.jpl.nasa.gov

 

Monday, October 1, 2018

DAY IN REVIEW

 

DAY IN REVIEW
Finding Open Water in Greenland's Icy Seas
Flying 200 mph at a height of 500 feet, OMG researchers must drop scientific probes safely into open water around Greenland's coast.
› Read the full story
What's Up in the October Skies?
Celebrate International Observe the Moon Night with your local astronomy club.
› Watch the video

 

Wednesday, September 26, 2018

DAY IN REVIEW

 

DAY IN REVIEW
NASA JPL latest news release
JPL Airborne Mission Is One of Five New Earth Ventures

Five new NASA Earth science campaigns, including one from NASA's Jet Propulsion Laboratory in Pasadena, California, will take to the field starting in 2020 to investigate a range of pressing research questions, from what drives intense East Coast snowfall events to the impact of small-scale ocean currents on global climate.

These studies will explore important, but not-well-understood, aspects of Earth system processes. They were competitively selected as part of NASA's Earth Venture-class program. This is NASA's third series of Earth Venture suborbital investigations, which are regularly solicited, sustained observation projects first recommended by the National Research Council in 2007. The first set of five projects was selected in 2010, and the second in 2014.

"These innovative investigations tackle difficult scientific questions that require detailed, targeted field observations combined with data collected by our fleet of Earth-observing satellites," said Jack Kaye, associate director for research in NASA's Earth Science Division in Washington.

The five newly selected Earth Venture investigations are:

  • River deltas and sea level rise -- Marc Simard of NASA's Jet Propulsion Laboratory in Pasadena, California, will lead the Delta-X investigation to better understand the natural processes that maintain and build land in major river deltas threatened by rising seas. The project will improve models that predict loss of coastal land from sea level rise by improving estimates of how deltas add land -- a process that involves trapping sediments and creating organic soils as plants grow. Delta-X will focus on the Mississippi River Delta using instruments on three NASA research aircraft.
     
  • Intense snowfall events -- Lynn McMurdie of the University of Washington will lead the Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms project to study the formation of snow bands in East Coast winter storms. Better understanding of the mechanisms of snow band formation and the factors that influence the location of the most intense snowfall will help improve forecasts of these extreme weather events. This study will involve flights of NASA's ER-2 and P-3B research aircraft over the northeastern United States.
  • Aerosols changing clouds -- Armin Sorooshian of the University of Arizona will lead the Aerosol Cloud Meteorology Interactions over the Western Atlantic Experiment to identify how aerosol particles change cloud properties in ways that affect Earth's climate system. The investigation will focus on marine boundary layer clouds over the western North Atlantic Ocean that have a critical role in our planet's energy balance. Two NASA research aircraft, an HU-25 Falcon and a B-200 King Air, will fly from NASA's Langley Research Center in Hampton, Virginia, to gather measurements from above, below and within.
     
  • Impact of strong storms on stratosphere -- Kenneth Bowman of Texas A&M University will lead the Dynamics and Chemistry of the Summer Stratosphere project to investigate how strong summertime convective storms over North America can change the chemistry of the stratosphere. These storms regularly penetrate deep into the lower stratosphere, carrying pollutants that can change the chemical composition of this atmospheric layer, including ozone levels. Flights of NASA's ER-2 high-altitude aircraft will be based in Salina, Kansas.
  • Ocean heating of the atmosphere -- Thomas Farrar of Woods Hole Oceanographic Institute will lead the Submesoscale Ocean Dynamics and Vertical Transport investigation to explore the potentially large influence that small-scale ocean eddies have on the exchange of heat between the ocean and the atmosphere. The project will collect a benchmark data set of climate and biological variables in the upper ocean that influence this exchange. Measurements will be collected by research aircraft and shipborne instruments 200 miles off the coast of San Francisco.

Six NASA centers and 27 educational institutions are participating in these five Earth Venture projects. The five-year investigations were selected from 30 proposals. The Delta-X project is funded at a total cost of no more than $15 million; each of the other projects is funded at no more than $30 million.

Earth Venture investigations are part of NASA's Earth System Science Pathfinder program, managed at Langley for the agency's Science Mission Directorate in Washington. Competitively selected orbital missions and field campaigns in this program provide innovative approaches to address Earth science research with frequent windows of opportunity to accommodate new scientific priorities.

NASA uses the vantage point of space to understand and explore our home planet, improve lives and safeguard our future. The agency's observations of Earth's complex natural environment are critical to understanding how our planet's natural resources and climate are changing now and could change in the future.

For more on NASA's Earth science activities, visit:

https://nasa.gov/earth

 

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DAY IN REVIEW

 

DAY IN REVIEW
Opportunity Emerges in a Dusty Picture
NASA still hasn't heard from the Opportunity rover, but at least we can see it again.
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NASA Tests Tiny Satellites to Track Global Storms
In a test that could mean better storm coverage, a miniature weather experiment proved it can measure thunderstorms from space.
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Monday, September 24, 2018

DAY IN REVIEW

 

DAY IN REVIEW
Dust Storms on Titan Spotted for the First Time
NASA's Cassini spacecraft has detected dust storms on Saturn's largest moon, making Titan the third Solar System body where such storms have been observed.
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NASA Study Untangles Smoke, Pollution Effects on Clouds
Smoke and human-caused pollution have different effects on the clouds that produce much of Earth's rainfall, a new study finds.
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