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NASA's Phoenix Mars Probe Set for Saturday Launch

NASA Delays Mars Probe's Launch, Eyes Shuttle Cabin Leak
On Launch Pad 17-A at Cape Canaveral Air Force Station, the first half of the fairing is moved into place around the Phoenix Mars Lander for installation for its planned August 2007 launch.
(Image: © NASA/George Shelton.)

A new NASA probedestined to dig into the arctic northern plains of Mars is on track for itsplanned Saturday launch, mission managers said Thursday.

Perchedatop its 13-story Delta 2 rocket, NASA'sPhoenix Mars lander is set to launch towards the red planet at 5:26:34 a.m.EDT (0926:34 GMT) during the first of two possible Saturday attempts fromFlorida's Cape Canaveral Air Force Station.

"For summertime in Florida, that is about the best time of day you can launch," said U.S.Air Force Delta 2 launch weather officer Joel Tumbiolo in a Thursday briefing atNASA's Kennedy Space Center in Cape Canaveral.

Current weatherforecasts offer an 80 percent chance of favorable conditions during Phoenix'sfirst launch opportunity, as well a second window that opens at 6:02:59 a.m.EDT (1002:59 GMT), Tumbiolo added. About the only weather concern is thepossibility of thick clouds near the Mars probe's launch site, he added.

The $420million Phoenix lander carries a mix of new science tools and recycled instrumentsoriginally designed for NASA's ill-fated 1999Mars Polar Lander and the canceled Mars Surveyor 2001 missions. The planned90-day mission, researchers hope, will unlock secrets hidden within the redplanet's subsurface ice and soil near its north pole, and shed light on whetherthe region could have once been habitable.

"Ourinstruments are specially designed to find evidence for periodic melting of theice and to assess whether this large region represents a habitable environmentfor Martian microbes," Phoenix principal investigator Peter Smith, of the Universityof Arizona, said of the mission's planned landing zone. ?

Phoenixcarries seven primary experiment packages, including an eight-foot (2.4-meter) roboticarm designed to scoop up martian soil and ice like a backhoe. It also carriestiny, deck-mounted ovens and other instruments to sift for signs of organiccompounds within the martian soil, as well as a suite of Mars weathermonitoring tools.

If all goeswell, Phoenix is expected to land on May 25, 2008 in a flat region known asVastitas Borealis at a northern Mars latitude that is comparable to those ofnorthern Alaska, Greenland or Siberia on Earth, mission managers have said.

Phoenix'sdescent to the martian surface, which relies on parachutes and a series ofpulse rocket thrusters, will mark NASA's first soft landing on Mars since the Vikingmissions of the 1970s.

NASA launchdirector Chuck Dovale said engineers are currently analyzing the impact of adropout in air conditioning around the protective, shroud-like launch fairing envelopingPhoenix atop its Delta 2 rocket, but the glitch is not expected to be a problemfor Saturday's planned liftoff.

Originallyslated for an Aug. 3 launch, Phoenix's Earth departure was delayedearlier this week after bad weather prevented the second stagefueling of the probe's Delta 2 rocket. NASA has a 22-day launch window to sendPhoenix off towards Mars that closes Aug. 24. Beyond that, the space agencywould have to wait 26 months - just over two years - for Mars and Earth to onceagain return to the proper orbital alignment for the mission.

With such arestricted launch window NASA officials have said they would consider delayingthe plannedAug. 7 launch of the space shuttle Endeavour from KSC to offer more flightopportunities for Phoenix.

"Wehave a three-week launch window, which is quite an extensive period,"Deborah Bass, NASA's deputy project scientist for Phoenix at JPL, toldreporters Wednesday during a series of interviews on NASA TV. "I feelconfident that we?ll get off Earth and on towards Mars within that time."

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