Phoenix Revises Method to Deliver Icy Sample (7/30/2008)

This July 26, 2008, view of the 'Snow White' trench, presented in approximately true color, shows the trench with multiple rasp holes. The Phoenix team is commanding the robotic arm scoop to shorten how long it rasps and lengthen how long it vibrates to get icy soil out of the scoop and into one of the lander's ovens. (NASA/JPL-Caltech/University of Arizona /Texas A&M University)

The revised plan shortens how long the rasp operates and lengthens how long the scoop vibrates.

NASA's Phoenix Mars Lander's robotic arm will use a revised collection-and-delivery sequence overnight Sunday with the goal of depositing an icy soil sample in the lander's oven.

"We are going to modify the process we ran on Sol 60 to acquire another icy sample and attempt to deliver it to TEGA," the Thermal and Evolved-Gas Analyzer, said Barry Goldstein, Phoenix project manager from NASA's Jet Propulsion Laboratory in Pasadena, Calif. "We will repeat what we did successfully with small modifications to adjust for what we learned."

The Sol 60 effort on July 26 by Phoenix successfully obtained a sample by rasping 16 holes into and scraping the work trench informally named "Snow White." Most of the sticky Martian soil adhered to the scoop even after the scoop was tipped and the rasp activated to help sprinkle soil into TEGA.

The revised plan includes reducing the length of time the rasp operates as it makes the holes in the trench to reduce any potential heating of the sample, and for increasing the number of times the scoop is vibrated during the sample delivery action.

Images received Sunday morning showed the soil collected on Sol 60 had fallen out of the scoop, which had been left inverted over the lander's deck.

Note: This story has been adapted from a news release issued by the University of Arizona

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