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2015

April 23, 2015

Dawn Commences its Science Oribt

Launched on September 27, 2007, the Dawn Spacecraft is finally ready to embark on its prime science campaign at Ceres. On April 23rd, at around 1:00 AM PDT, Dawn completed the ion thrusting necessary to shape its first mapping orbit "RC3." Dawn is now in a circular, polar orbit about 8,400 miles (13,500 km) in altitude with an orbit period of about two weeks.

The most recent Ceres images were publicly released on April 20th (Ceres' Bright Spots Come Back Into View | NASA). These final planned images of the approach phase were taken from a vantage point 14,000 miles above the north pole of Ceres as the spacecraft crossed the northern terminator from the dark side of the planet to the lit side.

Fun Fact—Since entering orbit on March 6, Dawn's ion propulsion system has changed its velocity by about 250 mph with the ion propulsion system to reshape its orbit to the desired conditions for the initial science observations. The total delta-V accomplished in the mission so far is approximately 10.8 km/sec (24,000 mph).



March 31, 2015

Dawn Closing in on Ceres

Dawn is in an elliptical orbit at an altitude of ~40,000 miles, traveling at 73 mph relative to Ceres—75,468 mph relative to Earth. The spacecraft passed the furthest point of the ellipse on March 18, where Ceres' gravitational pull was the weakest and Dawn's orbital velocity the lowest, and is closing back in on the dwarf planet, slowly picking up speed.

From this simulation, you can see that the spacecraft is still on the shadowed side of Ceres. It is continuing to use its ion propulsion system to reshape its orbit, targeting its first circular science orbit at an altitude of 8,400 miles, which it is on schedule to achieve on April 23. For more information, read this month's Dawn Journal.



February 28, 2015

Dawn Approaching the Dark Side of Ceres

Dawn is in the final stages of its approach trajectory to Ceres and will slip into orbit around the dwarf planet March 6, 2015. Dawn halted ion thrusting four times this month to take pictures of the dwarf planet for use in navigation. The spacecraft reached its closest distance to Ceres this past week. On Feb. 23 it was less than 39,000 kilometers (10% of the Earth-moon distance); Dawn will not be that close again until early April. This month's Dawn Journal and a new video: Destination Ceres: Breakfast at Dawn, explain Dawn's unique trajectory to Ceres and what we can anticipate when science orbits begin in April.



January 29, 2015

Dawn Approaching Ceres and Seeing the Sights

Dawn is now flying its approach trajectory to Ceres. The spacecraft is twice as close to Ceres as the moon is to Earth and slowly getting even closer as it prepared to enter orbit. Dawn halted ion thrusting twice this month to take pictures of the dwarf planet for use in navigation. These tantalizing glimpses are already raising expectations for an exciting mission there, and they will be followed by even better views next month. This month's Dawn Journal gives the plan for photographing Ceres throughout the rest of the approach phase.



December 29, 2014

Dawn Thrusting on Opposite Side of the Sun

Dawn devoted November to ion thrusting, and it is now about three times as far from Ceres as the moon is from Earth. As Earth and Dawn follow their separate orbits around the sun, they are moving to opposite sides of the solar system's star. To learn how to use the sun to locate Dawn early in December, see the November Dawn Journal, which also describes the new route the spacecraft will take into orbit around the dwarf planet.



November 30, 2014

Dawn Thrusting on Opposite Side of the Sun

Dawn devoted November to ion thrusting, and it is now about three times as far from Ceres as the moon is from Earth. As Earth and Dawn follow their separate orbits around the sun, they are moving to opposite sides of the solar system's star. To learn how to use the sun to locate Dawn early in December, see the November Dawn Journal, which also describes the new route the spacecraft will take into orbit around the dwarf planet.



October 31, 2014
Dawn Continues Smoothly Toward Ceres

As the spacecraft continues ion thrusting to reshape its orbit around the sun to match Ceres' orbit, it is moving ever closer to the dwarf planet. At the end of this month, Dawn is about 1.3 million miles (2.1 million kilometers) from Ceres, closing in at less than 900 mph (0.4 kilometers per second). It is on course for arriving in orbit in early March 2015. A summary of the schedule for photographing Ceres during the approach phase in January and

Dawn Continues Smoothly ToFebruary is in the October Dawn Journal, and a more detailed description will be presented in November.




September 27, 2014

Seven Years and Going Strong

On the seventh anniversary of its launch, Dawn's mission is continuing to go well. As it thrusts with its ion propulsion system, it is now less than 10 times farther from Ceres than Earth is from the moon.

Dawn has thrust for 68 percent of the time it has been in space (1,741 days), effectively changing its speed by 22,800 mph (10.2 kilometers per second). All this thrusting has consumed only 808 pounds (367 kilograms) of xenon propellant. For more details on the progress it has made in seven years of its deep-space adventure, see the latest Dawn Journal.

Earlier in the month, on Sep. 11, a high-energy particle of radiation struck an electrical component, causing the ion thrust to stop. The operations team guided the spacecraft back to normal operations, and ion thrusting resumed on Sep. 15. The October Dawn Journal will detail what occurred on the spacecraft, how the team dealt with it, and how the interruption in thrusting will change the approach phase of the Ceres mission. (The plan for scrutinizing Ceres from a series of progressively lower orbits will not change.)




August 31, 2014

Another Month of Ion Thrusting Complete

The spacecraft has completed another month of ion thrusting, bringing it ever closer to its rendezvous with Ceres. Dawn is now 3.0 million miles (4.8 million kilometers) from Ceres and approaching it at less than 1500 mph (2400 kilometers per hour). Dawn's fourth and final phase of orbital observations will be at 230 miles (375 kilometers) above the dwarf planet's surface. The three month low altitude mapping orbit is previewed in the August Dawn Journal, along with a brief look at what might happen after the conclusion of the planned mission.




July 31, 2014

Spacecraft Cruising Smoothly; Mission Control Simulates Problems

Dawn is propelling itself to Ceres with ion engine #1, which was not used from January 2010 until May 2014. Engineers verified that all the sensors the probe will use to explore Ceres are healthy. While the mission continues smoothly, the control team simulated dealing with a host of problems on the distant spacecraft. The July Dawn Journal provides an update on activities on the spacecraft and in mission control.




June 30, 2014

Dawn's Deep Space Voyage Going Well

With another month of ion thrusting complete, Dawn's interplanetary journey to Ceres continues to go well. It will spend about two months at an altitude of 910 miles (1,40 kilometers) for the third orbital phase of its exploration of the alien world. For a preview, read the June Dawn Journal.




May 31, 2014

Dawn's Journey Continuing Smoothly

The spacecraft devoted most of May to more gentle ion thrusting, bringing it ever closer to its rendezvous with dwarf planet Ceres. Dawn's second orbital phase around the dwarf planet will be at an altitude of 2,730 miles (4,400 kilometers). The May Dawn Journal presents a preview of this “survey orbit.”




April 30, 2014

Dawn Less than One Year from Ceres

Dawn is making good progress on its journey to Ceres and is now less than a year from arrival. To perform all of its planned observations, it will take advantage of the remarkable capability of its ion propulsion system by maneuvering extensively in orbit to provide different perspectives.The April Dawn Journal explains how the ship will spiral down to lower and lower altitudes above the alien landscapes.




March 31, 2014

Dawn Nearing Earth as It Climbs to Ceres

As Dawn continues its ion thrusting to reach Ceres, the independent orbits the spacecraft and Earth follow are about to bring them to their closest point since 2011. They will never be this near each other again, although Dawn is still farther from Earth than the sun is. To learn more about this intriguing orbital choreography, visit the March Dawn Journal.

The Dawn flight team received the National Air & Space Museum 2014 Trophy for Current Achievement. The Smithsonian Air & Space Magazine has a story about it here, and the Smithsonian made this video.




February 28, 2014

Dawn on Course and on Schedule as Ion Thrusting Continues

Dawn has completed another month of ion thrusting toward Ceres. After it is captured by Ceres's gravity early next year, it will continue descending to an altitude of 8,400 miles (13,500 kilometers) for its first intensive observations. Continuing the preview of the explorer's mission at the dwarf planet, the February Dawn Journal explains what the spacecraft will do during that orbit phase.




January 31, 2014

Dawn Continues Spiraling to Ceres

Dawn continues its spiral outward from the sun, heading for Ceres. The spacecraft is gradually changing its orbit so that it matches Ceres's orbit around the sun. In a little more than a year, this will allow the probe to be captured by the dwarf planet's gravity. Thanks to its ion propulsion system, Dawn's gentle, graceful entry into orbit is very different from the tense, whiplash-inducing method used by conventional missions. To learn more, visit the latest Dawn Journal for the second in a series of previews of how the ship will accomplish its ambitious mission at the alien world of rock and ice.





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