dawn.jpl.nasa.govOverview | Dawn – NASA Solar System Exploration

✕ Solar System Our Solar System Sun Kuiper Belt Oort Cloud Beyond Our Solar System Planets About Planets Moons About Moons Asteroids, Comets & Meteors About Asteroids, Comets & Meteors More News What's Up: Skywatching Tips from NASA Resources Raw Images People Missions Science Goals Technology Reports Kids Interactives Basics of Space Flight Solar System Ambassadors Scientist for a Day Missions Overview Dawn launched in 2007 on a journey that put about 4.3 billion miles (6.9 billion kilometers) on its odometer. Propelled by ion engines, the spacecraft achieved many firsts until its extended mission concluded on Nov. 1, 2018. The Latest Scientists Solve Mystery of Ceres' Lonely Mountain In 2011, when Dawn arrived at Vesta, the second largest world in the main asteroid belt, the spacecraft became the first to orbit a body in the region between Mars and Jupiter. In 2015, when Dawn went into orbit around Ceres, a dwarf planet that is also the largest world in the asteroid belt, the mission became the first to visit a dwarf planet and go into orbit around two destinations beyond Earth. Among its accomplishments, Dawn showed how important location was to the way objects in the early solar system formed and evolved. Dawn also reinforced the idea that dwarf planets could have hosted oceans over a significant part of their history – and potentially still do. The data Dawn beamed back to Earth from its four science experiments enabled scientists to compare two planet-like worlds that evolved very differently. 10 Things to Know About Dawn 10 Need-to-Know Things About Dawn 1 Two-for-One First Dawn was the first spacecraft to orbit two extraterrestrial destinations (Vesta and Ceres). 2 And ... First Orbit When Dawn arrived at Vesta, it became the first spacecraft to orbit an object in the main asteroid belt 3 And ... First Look When Dawn arrived at Ceres, it was the first spacecraft to visit a dwarf planet Full View of Vesta 4 Location, Location, Location Dawn showed us that location was key to how the early system organized and evolved. 5 Ocean Worlds Dawn reinforced that dwarf planets, not just icy moons, could have hosted oceans during a large part of their history — and potentially still do. 6 Building Blocks of Life Dawn found organics at Ceres and left us wanting to know more. 7 Science Fiction to Fact Star Wars’ far-ranging “TIE” fighters stand for “twin ion engine.” Thanks to its own ion engines, Dawn broke several exploration records. 8 More than a Space Rock Dawn found Vesta was a more varied world than scientists expected. 9 Bright Spots Dawn revealed that Ceres is geologically active—or was very recently. 10 Science to the End Dawn gathered science data at Ceres and returned it to Earth right up to the point the spacecraft ran out of fuel. Last Look at Ceres 11 Bright Spots Dawn revealed that Ceres is geologically active—or was very recently. Major Engineering Achievements Major Engineering Achievements First space mission to orbit two destinations Record-breaking use of solar-electric propulsion: 25,700 mph, 2.7x any prior spacecraft and nearly equal to the velocity provided by Dawn’s Delta launch vehicle Active powered flight: 5.9 years (54% of the time in space as of Sep. 7, 2018) Key Mission Findings Key Mission Findings Dawn orbited Vesta for more than a year, from July 2011 to September 2012. Its investigation confirmed that Vesta is the parent of the HED (howardites, eucrites, and diogenites) meteorites, which Dawn connected to Vesta’s large south polar basin, a priceless cosmic connection between samples in hand and a singular event on a small planet. The ejected material from this young crater in the Rheasilvia impact basin likely comes from deep inside Vesta. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA | › Full Image and Caption Vesta is small enough (about the same size as Saturn's moon Enceladus) to have been deeply scarred by the Rheasilvia impact that launched the HEDs, but large enough to have differentiated into an iron core, silicate mantle, and igneous crust. Dawn also found hydrated and carbon rich material on its surface supplied by impactors, a result that was unexpected based on pre-Dawn telescopic observations. After its escape from Vesta and its journey onward, Dawn entered orbit around Ceres in March 2015. Dawn discovered that the inner solar system’s only dwarf planet was an ocean world where water and ammonia reacted with silicate rocks. As the ocean froze, salts and other telltale minerals concentrated into deposits that are now exposed in many locations across the surface. Dawn also found organics in several locations on Ceres’ surface. Key Mission Events Key Mission Events 2007 — Launch (September) 2009 — Mars Gravity Assist (February) 2011 — Vesta Arrival (July) 2012 — Vesta Departure (September) 2015 — Ceres Arrival (March) 2016 — End of prime mission (June) 2016 — Start of first extension (July) 2017 — Start of second extension (November) › Go to Mission Timeline › Notable Explorers Notable Explorers Vishnu Reddy Scientist "Don't let anyone tell you that you can't do something. I tell students if someone like me with filmmaking background can do science, anyone can. " More about Vishnu Reddy Tony Carro Program Executive and Scientist "Space missions are the result of teamwork requiring the efforts of numerous participants." More about Tony Carro Shonte Tucker Thermal Systems Engineer "By the 5th grade my first long-term goal was set -- I was on a mission to become a mechanical engineer and work at JPL." More about Shonte Tucker Robert A. Mase Project Manager For Robert Mase, new Dawn Project Manager, the challenge of managing the many facets of a spacecraft whose trajectory is constantly changing is similarly exciting. More about Robert A. Mase Rachel Klima Scientist Don't be afraid to push yourself and learn new skills, yet don't be afraid to ask for help and collaborate. More about Rachel Klima Paul Schenk Scientist "We will be looking into one of most dynamic and dangerous phases in the formation of the Solar System, the formation of the large basins during the heavy bombardment." More about Paul Schenk Marc Rayman Mission Manager/Chief Engineer "Make your own luck -- work hard and take responsibility for your own success." More about Marc Rayman Kristina Larson Systems Engineer "Engineering is ... the coolest job on this planet and you will never be bored." More about Kristina Larson Keri Bean Science Planner "I couldn't believe that I was involved in space missions so early on in college." More about Keri Bean Amy Lovell Professor "Embrace your inner nerd and seek out others who speak your language and love the things you love." More about Amy Lovell Vishnu Reddy Scientist "Don't let anyone tell you that you can't do something. I tell students if someone like me with filmmaking background can do science, anyone can. " More about Vishnu Reddy Quick Facts Quick Facts Type: Orbiter Status: Successful Launch Date: Sept. 27, 2007 | 11:34 UTC Launch Location: Cape Canaveral Air Force Station, Florida Destinations: Vesta and Ceres More › Dawn: By the Numbers Dawn By the Numbers Dawn's end of mission statistics. Credit: NASA/JPL-Caltech | › Full image and caption Key statistics from the end of mission: 51,385 hours of ion engine thrusting. 172 GB of science data collected. 3,052 orbits around Vesta and Ceres 100,000 images taken. 4.3+ billion miles (6.9+ billion kilometers) traveled since launch. 367+ million miles (591+ million kilometers): Farthest distance from Earth. Top Dawn Images View a curated selection of Dawn's best images. View Images › More to Explore Spacecraft View image gallery of NASA's Dawn spacecraft. Vesta View image gallery of the second-largest world in the asteroid belt. Ceres View image gallery of the dwarf planet Ceres. All Images › More Resources More Resources End of Mission Toolkit Launch Press Kit Vesta Press Kit Ceres Press Kit Dawn Journal About Us Bibliography Feedback Privacy Image ...