A
beleaguered NASA probe bound for the solar system's two largest space rocks
returned to its Florida launch pad Tuesday after two months of delay.
Engineers
hoisted the space agency's Dawn asteroid probe atop its Delta 2 rocket at the
Cape Canaveral Air Force Station following a series of
launch delays and scrubs earlier this summer.
"From
here, the only way to go is up," said Dawn project manager Keyur Patel, of
NASA's Jet Propulsion Laboratory in Pasadena, California, in a statement.
"We are looking forward to putting some space between Dawn and Mother
Earth and making some space history."
Dawn is
slated to begin its planned
eight-year mission to the asteroids Vesta and Ceres with a 7:25 a.m. EDT
(1125 GMT) launch on Sept. 26.
Vesta is a
bright, dense asteroid, while the spherical Ceres is large enough to be
considered a dwarf planet. Dawn researchers hope that by studying the two
space rocks, they will better understand how planets formed in the early
solar system.
Earlier
attempts to launch Dawn in July were plagued by bad weather, booster glitches
and difficulties in arranging air and ship-based tracking systems for the
planned liftoff.
Mission
managers opted to postpone Dawn's mission until September, after the launch of NASA's
Phoenix Mars Lander. The delay is expected to add about $25 million to
Dawn's $449 million mission cost, NASA has said.
NASA also
canceled Dawn's mission outright in March 2006, but reinstated the asteroid
expedition a few weeks later after reevaluating budget and technical hurdles.
Dawn is
slated to rendezvous and orbit Vesta in 2011 before heading off for a February
2015 appointment with Ceres. Both asteroids sit in the Asteroid Belt that runs
between the orbits of Mars and Jupiter.
NASA must
launch Dawn by late October, after which its space rock
targets will begin moving away from one another in their respective orbits.
After Dawn's 2007 launch window, Ceres and Vesta won't be near enough to one
another for about 15 years, mission managers have said.
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