Skip to comments.Martian Soil Sample Clogs Phoenix Probe's Oven
Posted on 06/07/2008 9:48:41 PM PDT by BenLurkin
Scientists ran into a snag when trying to deliver a sample of Martian arctic soil to one of the instruments on NASA's Phoenix Mars Lander, mission controllers said on Saturday.
The lander's robotic arm released a handful of clumpy Martian soil onto a screened opening of the Thermal and Evolved-Gas Analyzer (TEGA) on Friday, but the instrument did not confirm that any of the sample passed through the screen.
Images taken on Friday show soil resting on the screen over an open sample-delivery door of TEGA, which is designed to heat up soil samples and analyze the vapors they give off to determine the soil's composition.
The researchers have not yet determined why none of the sample appears to have gotten past the screen, but they have begun proposing possibilities.
"I think it's the cloddiness of the soil and not having enough fine granular material," said Ray Arvidson of Washington University in St. Louis, the digging czar for the $420 million Phoenix mission.
The Phoenix lander touched down on the red planet on May 25 to begin a planned three-month mission to hunt for buried water ice in the northern polar region of Mars. It is equipped with a scoop-tipped robotic arm, weather station, wet chemistry lab and eight ovens to study samples of Martian terrain and determine if the region could have once supported primitive life.
TEGA's screen is designed to let through particles up to 0.04 inch (1 millimeter) across while keeping out larger particles, in order to prevent clogging a funnel pathway to a tiny oven inside.
Mission scientists said they planned to send new commands to Phoenix to try to shake the sample into the oven as early as Monday. They'll spend Sunday developing the plan for the following Martian day.
The small vibration tool can shake the oven screen across a variety of frequencies, ranging from a light tapping to moderate shake, mission managers said.
"The soil that we're looking at is probably sandy and it has a lot of fine grains and dust, but it is also a little bit cohesive," Arvidson said. "I'm pretty confident that if we shake this stuff, we'll get some in."
For future samples, they may use the robotic arm to prepare a site by poking and prodding the Martian surface to break up clumps and clods. They may also collect smaller scoops of material to pour directly into the oven.
While this is the first oven they've tried to pour samples into, it is designated Oven 4 of eight. Despite the overflow of soil across the other oven doors, mission managers are confident the extra stuff won't hinder the opening of other instruments.
The TEGA ovens have an opening just 2 mm wide and are designed to collect about 30 milligrams of material for baking.
Phoenix's planned activities for Saturday include horizontally extending a trench, dubbed "Dodo," where the lander dug two practice scoops earlier this week, and taking additional images of a small pile of soil that was scooped up and dropped onto the surface during the second of those practice digs.
"We are hoping to learn more about the soil's physical properties at this site," Arvidson said. "It may be more cohesive than what we have seen at earlier Mars landing sites."
Mars Lander Ping
It was Marvin the Martian, again.
The Maytag repair man’s on it.
Hate it when that happens.
Didn't any of the team members consider this possibility when they planned the mission?
Unrelated - why am I getting a mental image of an "EZ Bake Oven?"
Independent Validation & Verification of the design and sioftware might have found this glitch before the lander was built.
One thing I’ve noticed is the change in language about the presumed ice layer. Initially they thought they were looking at ice below the lander, but when they scraped at it and had white flecks come up, suddenly they called it “ice or salt”, and slowly “salt” and “salts” creeped into the picture. So what I’m thinking is that THERE IS NO ICE, and that THEY WERE ALL WRONG. Well, it will be interesting. Maybe it is ice. How would I know.
It’s not a software problem.
But it may be a design or system requirements problem. Post # 8 also asks about this.
Some jerk on Mars threw his used bubblegum on the ground instead of properly disposing it.
Yet more reasons that we need to send a humanned mission to Mars.
You’d think they would have built a screen into the scoop itself, with a little door at the bottom of the scoop to let the screened material out and onto the open opening screen. That way they could simply dump out any over sized or clumpy material while it’s still in the scoop rather than trying to “shake” it off the whole lander.
Obviously, they never consulted any excavator operators when they built the thing.
Ah wisht ah was a rocket scientist.
this guy is going to have one long trip for his next repair job.
The lump of soil is actually a Martian life-form resisting being baked in an oven.