Phoenix Mission Status Report
PASADENA, Calif. - NASA'S Phoenix Mars Lander entered safe mode late yesterday
in response to a low-power fault brought on by deteriorating weather conditions.
While engineers anticipated that a fault could occur due to the diminishing
power supply, the lander also unexpectedly switched to the "B" side of its
redundant electronics and shut down one of its two batteries.
During safe mode, the lander stops non-critical activities and awaits further
instructions from the mission team. Within hours of receiving information of
the safing event, mission engineers at NASA's Jet Propulsion Laboratory, Pasadena,
Calif., and at Lockheed Martin in Denver, were able to send commands to restart
battery charging. It is not likely that any energy was lost.
Weather conditions at the landing site in the north polar region of Mars have
deteriorated in recent days, with overnight temperatures falling to -141F (-96C),
and daytime temperatures only as high as -50F (-45C), the lowest temperatures
experienced so far in the mission. A mild dust storm blowing through the area,
along with water-ice clouds, further complicated the situation by reducing the
amount of sunlight reaching the lander's solar arrays, thereby reducing the
amount of power it could generate. Low temperatures caused the lander's battery
heaters to turn on Tuesday for the first time, creating another drain on precious
Science activities will remain on hold for the next several days to allow the
spacecraft to recharge and conserve power. Attempts to resume normal operations
will not take place before the weekend.
"This is a precarious time for Phoenix," said Phoenix Project Manager Barry Goldstein
of JPL. "We're in the bonus round of the extended mission, and we're aware that the
end could come at any time. The engineering team is doing all it can to keep the
spacecraft alive and collecting science, but at this point survivability depends
on some factors out of our control, such as the weather and temperatures on Mars."
The ability to communicate with the spacecraft has not been impacted. However, the
team decided to cancel communication sessions Wednesday morning in order to conserve
spacecraft power. The next communication pass is anticipated at 9:30 p.m. PDT Wednesday.
Yesterday, the mission announced plans to turn off four heaters, one at a time, in
an effort to preserve power. The faults experienced late Tuesday prompted engineers
to command the lander to shut down two heaters instead of one as originally planned.
One of those heaters warmed electronics for Phoenix's robotic arm, robotic-arm camera,
and thermal and evolved-gas analyzer (TEGA), an instrument that bakes and sniffs
Martian soil to assess volatile ingredients. The second heater served the lander's
pyrotechnic initiation unit, which hasn't been used since landing. By turning off
selected heaters, the mission hopes to preserve power and prolong the use of the
lander's camera and meteorological instruments.
Originally scheduled to last 90 days, Phoenix has completed a fifth month of exploration
in the Martian arctic. As the Martian northern hemisphere shifts from summer to autumn,
the lander was expected to generate less power due to fewer hours of sunlight
reaching its solar panels. "It could be a matter of days, or weeks, before the
daily power generated by Phoenix is less than needed to operate the spacecraft,"
said JPL mission manager Chris Lewicki. "We have only a few options left to reduce
the energy usage."
The Phoenix mission is led by Peter Smith of the University of Arizona, Tucson, with
project management at the Jet Propulsion Laboratory and development partnership at
Lockheed Martin, Denver. International contributions come from the Canadian Space Agency;
the University of Neuchatel, Switzerland; the universities of Copenhagen and Aarhus
in Denmark; the Max Planck Institute in Germany; and the Finnish Meteorological
Institute. The California Institute of Technology in Pasadena manages JPL for NASA.
Media contacts: Veronica McGregor 818-354-9452
Jet Propulsion Laboratory, Pasadena, Calif.