NASA's Ingenuity Mars Helicopter has emerged from its first night on the surface of Mars.

Evening temperatures at Jezero Crater can plunge as low as minus 130 degrees Fahrenheit (minus 90 degrees Celsius), which can freeze and crack unprotected electrical components and damage the onboard batteries required for flight. Surviving that first night after being deployed from where it was attached to the belly of NASA's Perseverance rover on April 3 is a major milestone for the 4-pound (1.8 kilograms) rotorcraft. In the days to come, Ingenuity will be the first aircraft to attempt powered, controlled flight on another planet.

"This is the first time that Ingenuity has been on its own on the surface of Mars," said MiMi Aung, Ingenuity project manager at NASA's Jet Propulsion Laboratory in Southern California. "But we now have confirmation that we have the right insulation, the right heaters, and enough energy in its battery to survive the cold night, which is a big win for the team. We're excited to continue to prepare Ingenuity for its first flight test."

Devising a craft small enough to fit onto the rover, light enough to fly in Mars' thin atmosphere, yet hardy enough to withstand the Martian cold presented significant challenges. To ensure the solar array atop the helicopter's rotors could begin getting sunlight as soon as possible, Perseverance was instructed to move away from Ingenuity shortly after deploying it.

Until the helicopter put its four legs onto the Martian surface, Ingenuity remained attached to the belly of the rover, receiving power from Perseverance, which touched down at Jezero Crater on Feb. 18. The rover serves as a communications relay between Ingenuity and Earth, and it will use its suite of cameras to observe the flight characteristics of the solar-powered helicopter from "Van Zyl Overlook."

The sole mission of Ingenuity, a technology demonstration, is to conduct flight tests in the thin atmosphere of Mars; the helicopter carries no science instruments. Within 30 Martian days, or sols (a Martian day is 24.6 hours), on the surface, Ingenuity will complete its testing, and Perseverance's scientific exploration of Jezero Crater will kick into high gear.

"Our 30-sol test schedule is frontloaded with exciting milestones," said Teddy Tzanetos, deputy operations lead for the Ingenuity Mars Helicopter at JPL. "Whatever the future holds, we will acquire all the flight data we can within that timeframe."

The Month of Ingenuity
On April 4, Perseverance downlinked the first of the images of the helicopter on the surface of Mars. Taken by the rover's rear left Hazard Avoidance camera, the image shows the helicopter's rotor blades still stacked in alignment on top of each other (a configuration used to save room during the trip to Mars) and its four footpads firmly planted into the surface of Mars.

For the next two days, Ingenuity will collect information about how well the thermal-control and power systems perform now that the small helicopter is standing on its own in the Mars environment. That information will be used to fine tune Ingenuity's thermal-control system to help it survive the harsh Mars nights through the entire flight experiment period.

On April 7, the restraints that have been holding the rotor blades together since before launch are scheduled to be released. If the mission team meets that milestone, the next several sols will involve more testing of the rotor blades as well as the motors that drive them. There are also checkouts of the inertial measurement unit (an electronic device that measures a body's orientation and angular rate) and onboard computers tasked with autonomously flying the helicopter. Additionally, the team will continue to monitor the helicopter's energy performance, including assessment of solar-array power and state of charge of the craft's six lithium ion batteries.

If all goes well with each of the myriad preflight checks, Ingenuity's first attempt to lift off from the middle of its 33-by-33-foot (10-by-10-meter) "airfield" - chosen for its flatness and lack of obstructions - will be no sooner than the evening of April 11.

Subsequent flight tests will be scheduled throughout the Month of Ingenuity, with Perseverance's cameras providing plenty of high-definition images of the historic mission.

6 Things to Know About NASA's Ingenuity Mars Helicopter
When NASA's Mars 2020 Perseverance rover launches from Cape Canaveral Air Force Station in Florida later this summer, an innovative experiment will ride along: the Ingenuity Mars Helicopter. Ingenuity may weigh only about 4 pounds (1.8 kilograms), but it has some outsize ambitions.

"The Wright Brothers showed that powered flight in Earth's atmosphere was possible, using an experimental aircraft," said Havard Grip, Ingenuity's chief pilot at NASA's Jet Propulsion Laboratory in Southern California. "With Ingenuity, we're trying to do the same for Mars."

Here are six things you should know about the first helicopter going to another planet:

1. Ingenuity is a flight test.
Ingenuity is what is known as a technology demonstration - a project that seeks to test a new capability for the first time, with limited scope. Previous groundbreaking technology demonstrations include the Mars Pathfinder rover Sojourner and the tiny Mars Cube One (MarCO) CubeSats that flew by Mars in 2018.

Ingenuity features four specially made carbon-fiber blades, arranged into two rotors that spin in opposite directions at around 2,400 rpm - many times faster than a passenger helicopter on Earth. It also has innovative solar cells, batteries, and other components. Ingenuity doesn't carry science instruments and is a separate experiment from the Mars 2020 Perseverance rover.

2. Ingenuity will be the first aircraft to attempt controlled flight on another planet.
What makes it hard for a helicopter to fly on Mars? For one thing, Mars' thin atmosphere makes it difficult to achieve enough lift. Because the Mars atmosphere is 99% less dense than Earth's, Ingenuity has to be light, with rotor blades that are much larger and spin much faster than what would be required for a helicopter of Ingenuity's mass on Earth.

It can also be bone-chillingly cold at Jezero Crater, where Perseverance will land with Ingenuity attached to its belly in February 2021. Nights there dip down to minus 130 degrees Fahrenheit (minus 90 degrees Celsius). While Ingenuity's team on Earth has tested the helicopter at Martian temperatures and believes it should work on Mars as intended, the cold will push the design limits of many of Ingenuity's parts.

In addition, flight controllers at JPL won't be able to control the helicopter with a joystick. Communication delays are an inherent part of working with spacecraft across interplanetary distances. Commands will need to be sent well in advance, with engineering data coming back from the spacecraft long after each flight takes place. In the meantime, Ingenuity will have a lot of autonomy to make its own decisions about how to fly to a waypoint and keep itself warm.

3. Ingenuity is a fitting name for a robot that is the result of extreme creativity.
High school student Vaneeza Rupani of Northport, Alabama, originally submitted the name Ingenuity for the Mars 2020 rover, before it was named Perseverance, but NASA officials recognized the submission as a terrific name for the helicopter, given how much creative thinking the team employed to get the mission off the ground.

"The ingenuity and brilliance of people working hard to overcome the challenges of interplanetary travel are what allow us all to experience the wonders of space exploration," Rupani wrote. "Ingenuity is what allows people to accomplish amazing things."

4. Ingenuity has already demonstrated feats of engineering.
In careful steps from 2014 to 2019, engineers at JPL demonstrated that it was possible to build an aircraft that was lightweight, able to generate enough lift in Mars' thin atmosphere, and capable of surviving in a Mars-like environment. They tested progressively more advanced models in special space simulators at JPL. In January 2019, the actual helicopter that is riding with Perseverance to the Red Planet passed its final flight evaluation. Failing any one of these milestones would've grounded the experiment.

5. The Ingenuity team will count success one step at a time.
Given the firsts Ingenuity is trying to accomplish, the team has a long list of milestones they'll need to pass before the helicopter can take off and land in the spring of 2021. The team will celebrate each time they meet one. The milestones include:

+ Surviving the launch from Cape Canaveral, the cruise to Mars, and landing on the Red Planet

+ Safely deploying to the surface from Perseverance's belly

+ Autonomously keeping warm through the intensely cold Martian nights

+ Autonomously charging itself with its solar panel

And then Ingenuity will make its first flight attempt. If the helicopter succeeds in that first flight, the Ingenuity team will attempt up to four other test flights within a 30-Martian-day (31-Earth-day) window.

6. If Ingenuity succeeds, future Mars exploration could include an ambitious aerial dimension.
Ingenuity is intended to demonstrate technologies needed for flying in the Martian atmosphere. If successful, these technologies could enable other advanced robotic flying vehicles that might be included in future robotic and human missions to Mars. They could offer a unique viewpoint not provided by current orbiters high overhead or by rovers and landers on the ground, provide high-definition images and reconnaissance for robots or humans, and enable access to terrain that is difficult for rovers to reach.

"The Ingenuity team has done everything to test the helicopter on Earth, and we are looking forward to flying our experiment in the real environment at Mars," said MiMi Aung, Ingenuity's project manager at JPL. "We'll be learning all along the way, and it will be the ultimate reward for our team to be able to add another dimension to the way we explore other worlds in the future."

Related Links
Ingenuity at NASA
Mars News and Information at MarsDaily.com
Lunar Dreams and more

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NASA's Ingenuity helicopter dropped on Mars' surface ahead of flight
Washington (AFP) April 4, 2021
NASA's Ingenuity mini-helicopter has been dropped on the surface of Mars in preparation for its first flight, the US space agency said. The ultra-light aircraft had been fixed to the belly of the Perseverance rover, which touched down on the Red Planet on February 18. "MarsHelicopter touchdown confirmed!" NASA's Jet Propulsion Laboratory tweeted Saturday. "Its 293 million mile (471 million kilometer) journey aboard @NASAPersevere ended with the final drop of 4 inches (10 centimeter) from the ... read more

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