[meteorite-list] Dawn in Excellent Shape One Month After Ceres Arrival

From: Ron Baalke <baalke_at_meteoritecentral.com>
Date: Tue, 7 Apr 2015 16:00:38 -0700 (PDT)
Message-ID: <201504072300.t37N0c95019712_at_zagami.jpl.nasa.gov>


Dawn in Excellent Shape One Month After Ceres Arrival
Jet Propulsion Laboratory
April 6, 2015

Since its capture by the gravity of dwarf planet Ceres on March 6, NASA's
Dawn spacecraft has performed flawlessly, continuing to thrust with its
ion engine as planned. The thrust, combined with Ceres' gravity, is gradually
guiding the spacecraft into a circular orbit around the dwarf planet.
All of the spacecraft's systems and instruments are in excellent health.

Dawn has been following its planned trajectory on the dark side of Ceres
-- the side facing away from the sun -- since early March. After it entered
orbit, the spacecraft's momentum carried it to a higher altitude, reaching
a maximum of 46,800 miles (75,400 kilometers) on March 18. Today, Dawn
is about 26,000 miles (42,000 kilometers) above Ceres, descending toward
the first planned science orbit, which will be 8,400 miles (13,500 kilometers)
above the surface.

The next optical navigation images of Ceres will be taken on April 10
and April 14, and are expected to be available online after initial analysis
by the science team. In the first of these, the dwarf planet will appear
as a thin crescent, much like the images taken on March 1, but with about
1.5 times higher resolution. The April 14 images will reveal a slightly
larger crescent in even greater detail. Once Dawn settles into the first
science orbit on April 23, the spacecraft will begin the intensive prime
science campaign.

By early May, images will improve our view of the entire surface, including
the mysterious bright spots that have captured the imaginations of scientists
and space enthusiasts alike. What these reflections of sunlight represent
is still unknown, but closer views should help determine their nature.
The regions containing the bright spots will likely not be in view for
the April 10 images; it is not yet certain whether they will be in view
for the April 14 set.

On May 9, Dawn will complete its first Ceres science phase and begin to
spiral down to a lower orbit to observe Ceres from a closer vantage point.

Dawn previously explored the giant asteroid Vesta for 14 months, from
2011 to 2012, capturing detailed images and data about that body.

Dawn's mission is managed by NASA's Jet Propulsion Laboratory, Pasadena,
California, for NASA's Science Mission Directorate in Washington. Dawn
is a project of the directorate's Discovery Program, managed by NASA's
Marshall Space Flight Center in Huntsville, Alabama. UCLA is responsible
for overall Dawn mission science. Orbital ATK Inc., in Dulles, Virginia,
designed and built the spacecraft.

The German Aerospace Center, Max Planck Institute for Solar System Research,
Italian Space Agency and Italian National Astrophysical Institute are
international partners on the mission team. For a complete list of mission
participants, visit:


More details about Dawn's trajectory are available at:


More information about Dawn is online at:


Media Contact

Elizabeth Landau
Jet Propulsion Laboratory, Pasadena, Calif.
Elizabeth.Landau at jpl.nasa.gov

Received on Tue 07 Apr 2015 07:00:38 PM PDT

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