United Launch Alliance (ULA) and NASA has successfully launched the Mars 2020 mission with the Perseverance rover abroad an Atlas V rocket.
The rocket lifted off from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida at 7:50 a.m. EDT (4:50 a.m. PDT) on July 30, 2020.
The ULA Atlas V’s Centaur upper stage initially placed the Mars 2020 spacecraft into a parking orbit around Earth. The engine fired for a second time and the spacecraft separated from the Centaur as expected. Navigation data indicate the spacecraft is perfectly on course to Mars.
Mars 2020 sent its first signal to ground controllers via NASA’s Deep Space Network at 9:15 a.m. EDT (6:15 a.m. PDT). However, telemetry (more detailed spacecraft data) had not yet been acquired at that point. Around 11:30 a.m. EDT (8:30 a.m. PDT), a signal with telemetry was received from Mars 2020 by NASA ground stations. Data indicate the spacecraft had entered a state known as safe mode, likely because a part of the spacecraft was a little colder than expected while Mars 2020 was in Earth’s shadow. All temperatures are now nominal and the spacecraft is out of Earth’s shadow.
When a spacecraft enters safe mode, all but essential systems are turned off until it receives new commands from mission control. An interplanetary launch is fast-paced and dynamic, so a spacecraft is designed to put itself in safe mode if its onboard computer perceives conditions are not within its preset parameters. Right now, the Mars 2020 mission is completing a full health assessment on the spacecraft and is working to return the spacecraft to a nominal configuration for its journey to Mars.
The Perseverance rover’s astrobiology mission is to seek out signs of past microscopic life on Mars, explore the diverse geology of its landing site, Jezero Crater, and demonstrate key technologies that will help us prepare for future robotic and human exploration.
“Jezero Crater is the perfect place to search for signs of ancient life,” said Thomas Zurbuchen, associate administrator for NASA’s Science Mission Directorate at the agency’s headquarters in Washington. “Perseverance is going to make discoveries that cause us to rethink our questions about what Mars was like and how we understand it today. As our instruments investigate rocks along an ancient lake bottom and select samples to return to Earth, we may very well be reaching back in time to get the information scientists need to say that life has existed elsewhere in the universe.”
The Martian rock and dust Perseverance’s Sample Caching System collects could answer fundamental questions about the potential for life to exist beyond Earth. Two future missions currently under consideration by NASA, in collaboration with ESA (European Space Agency), will work together to get the samples to an orbiter for return to Earth. When they arrive on Earth, the Mars samples will undergo in-depth analysis by scientists around the world using equipment far too large to send to the Red Planet.
While most of Perseverance’s seven instruments are geared toward learning more about the planet’s geology and astrobiology, the MOXIE (Mars Oxygen In-Situ Resource Utilization Experiment) instrument’s job is focused on missions yet to come. Designed to demonstrate that converting Martian carbon dioxide into oxygen is possible, it could lead to future versions of MOXIE technology that become staples on Mars missions, providing oxygen for rocket fuel and breathable air.
Also future-leaning is the Ingenuity Mars Helicopter, which will remain attached to the belly of Perseverance for the flight to Mars and the first 60 or so days on the surface. A technology demonstrator, Ingenuity’s goal is a pure flight test – it carries no science instruments.
地球超过30溶胶(31天),直升飞机attempt up to five powered, controlled flights. The data acquired during these flight tests will help the next generation of Mars helicopters provide an aerial dimension to Mars explorations – potentially scouting for rovers and human crews, transporting small payloads, or investigating difficult-to-reach destinations.
The rover’s technologies for entry, descent, and landing also will provide information to advance future human missions to Mars.
“Perseverance is the most capable rover in history because it is standing on the shoulders of our pioneers Sojourner, Spirit, Opportunity, and Curiosity,” said Michael Watkins, director of NASA’s Jet Propulsion Laboratory in Southern California. “In the same way, the descendants of Ingenuity and MOXIE will become valuable tools for future explorers to the Red Planet and beyond.”
About seven cold, dark, unforgiving months of interplanetary space travel lay ahead for the mission – a fact never far from the mind of Mars 2020 project team.
“There is still a lot of road between us and Mars,” said John McNamee, Mars 2020 project manager at JPL. “About 290 million miles of them. But if there was ever a team that could make it happen, it is this one. We are going to Jezero Crater. We will see you there Feb. 18, 2021.”
The Mars 2020 Perseverance mission is part of America’s larger Moon to Mars exploration approach that includes missions to the Moon as a way to prepare for human exploration of the Red Planet. Charged with sending the first woman and next man to the Moon by 2024, NASA will establish a sustained human presence on and around the Moon by 2028 through NASA’s Artemis program.
JPL, which is managed for NASA by Caltech in Pasadena, California, built and will manage operations of the Mars Perseverance rover. NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida, is responsible for launch management, and ULA provided the Atlas V rocket.
ULA Atlas V rocket
ULA and its heritage rockets have launched every U.S. led mission to Mars, beginning in the 1960s. The launch of this mission marks ULA’s 20th trip to the red planet and the 85th successful launch of an Atlas V rocket. The Atlas V has previously launched four missions to Mars, including the Mars Reconnaissance Orbiter in 2005, the Curiosity rover in 2011, the MAVEN orbiter in 2013 and the InSight lander in 2018.
“谢谢你的齿龈团队和我们的NASA使命rtners for diligently working through an ever-changing environment to successfully launch this historic mission,” said Gary Wentz, ULA vice president of Government and Commercial Programs. “The complexity of the Mars 2020 mission proves ULA’s acceptance of the most challenging launch requirements and we work together with NASA to achieve them. Our guidance accuracy for interplanetary missions is unmatched, and the Atlas V is the only vehicle certified to launch payloads with nuclear power sources.”
One of the most powerful rockets in the Atlas V fleet, the 541 configuration, with four solid rocket boosters, provides optimum performance to precisely deliver a range of mission types. In addition to three national security and two weather satellites, an Atlas V 541 rocket launched NASA’s Curiosity rover on its 10-month, 354 million-mile journey to the surface of Mars.
This Atlas V 541 configuration vehicle included a 5-meter payload fairing (PLF) and stood at 197 ft. tall. The Atlas booster for this mission was powered by the RD AMROSS RD-180 engine. Aerojet Rocketdyne provided the four AJ-60A SRBs and RL10C-1 engine for the Centaur upper stage.
NASA’s Launch Services Program (LSP) at the agency’s Kennedy Space Center in Florida selected United Launch Alliance’s (ULA’s) proven Atlas V vehicle for this mission and is responsible for management and oversight of the Atlas V launch services. LSP selected this rocket because it has the right liftoff capability for the “heavy weight” requirements for NASA’s Mars 2020 Perseverance rover launch.
To date ULA has launched 140 times with 100 percent mission success.