Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..730r&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
By successively orbiting both 4 Vesta and 1 Ceres the Dawn mission = obtains geophysical and geochemical data on diverse main belt asteroids. = Ceres and Vesta are two complementary terrestrial protoplanets (one = apparently ""wet"" and the other ""dry"") whose accretion was terminated by = the formation of Jupiter. Ceres is little changed since it formed in the = early solar system while Vesta has experienced significant heating and = differentiation. Both have remained intact over the age of the solar = system thereby retaining a record of events and processes from the time = of planet formation. Dawn is to be launched in May 2006 arriving at = Vesta in 2010 and Ceres in 2014 stopping at each to make 11 months of = orbital measurements. Dawn carries a framing camera visible = and infrared mapping spectrometer gamma ray/neutron spectrometer laser = altimeter magnetometer and radio science. One-AU-based measurements of Vesta and Ceres are needed at upcoming opportunities to maximize the = science return of the mission. In particular the spin axis of Ceres = needs to be known more accurately to choose the arrival date at Ceres to = maximize coverage of both poles.
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