What to expect during Perseverance’s landing on Mars – Now

This illustration exhibits the occasions that happen within the last minutes of the almost seven-month journey that NASA’s Perseverance rover takes to Mars. Credit score: NASA/JPL-Caltech

NASA’s nuclear-powered Perseverance rover is to at Mars on Thursday with a make-or- entry, descent, and touchdown. The rover will execute the arrival autonomously, whereas engineers and scientists again on Earth can have a nail-biting 11-minute look forward to indicators to succeed in house confirming the destiny of the $2.7 billion mission.

The one-ton rover is on the ultimate stretch of a seven-month journey from Earth to Mars, searching for to turn into the ninth U.S. spacecraft that has efficiently landed on the Crimson Planet.

The mission is aiming to land inside a 4-mile-wide (7-kilometer) zone inside Jezero Crater, an influence basin scientists consider was flooded with liquid water billions of years in the past.

Perseverance was ferried to Mars by a cruise stage, which carried photo voltaic panels and thrusters for course correction maneuvers on the 293 million-mile (471 million-kilometer) interplanetary journey. One of many first duties for Perseverance earlier than it will possibly land on Mars is to jettison the ring-shaped cruise stage.

Floor groups at NASA’s Jet Propulsion Laboratory in Pasadena, California, count on to obtain affirmation of the cruise stage jettison at 3:38 p.m. EST (2038 GMT), though the precise occasion will happen 11 minutes earlier. The cruise stage will dissipate throughout entry into the Martian environment, leaving the Perseverance rover — cocooned inside a 14.8-foot-diameter (4.5-meter) thermal protect — to plunge towards the Crimson Planet’s floor by itself.

NASA expects to obtain indicators from Perseverance confirming it has entered the Crimson Planet’s carbon dioxide environment at 3:48 p.m. EST (2048 GMT), kicking off a fast-paced sequence of occasions culminating within the reducing of the cellular robotic geologist to the Martian floor on its six titanium-supported aluminum wheels. Strain sensors, temperature probes, and cameras will file information throughout Perseverance’s entry, descent, and touchdown.

Engineers at on Earth, some 127 million miles (204 million kilometers) from Mars, count on indicators confirming Perseverance’s touchdown at 3:55 p.m. EST (2055 GMT), assuming the whole lot goes in line with plan.

Right here’s a step-by-step timeline of the entry, descent, and touchdown sequence, starting in the mean time Perseverance’s warmth protect first encounters the higher traces of the Martian environment:

  • Entry+00:00: Atmospheric entry.
  • Entry+01:20: Peak entry heating, with temperatures outdoors the warmth protect reaching about 2,370 levels Fahrenheit (1,300 levels Celsius).
  • Entry+01:30: Peak deceleration.
  • Entry+04:00: Perseverance deploys its 70.5-foot-wide (21.5-meter) supersonic at an altitude of about 7 miles (11 kilometers) and a velocity of about 940 mph (1,512 kilometers per hour). The craft deploys the chute when it detects that it has reached a predetermined distance from the touchdown website.
  • Entry+04:20: Perseverance jettisons its no-longer-needed warmth protect, revealing a touchdown radar and cameras to assist the spacecraft navigate to a protected touchdown website.
  • Entry+04:50: Radar lock on the Martian floor.
  • Entry+05:30: Perseverance obtains a terrain relative navigation answer through the use of pictures captured by on- cameras to seek for a protected touchdown website.
  • Entry+05:50: The Perseverance rover jettisons its backshell at an altitude of 1.Three miles (2.1 kilometers), liberating the craft’s descent stage to fireside eight throttleable retrorockets to gradual for touchdown. After reaching an altitude of about 66 toes, or 20 meters, the descent stage will decrease the rover on Nylon cords to a distance of about 25 toes (7.6 meters). The rover’s wheels will deploy earlier than setting down in Jezero Crater.
  • Entry+6:50: Perseverance lands on Mars. Pyrotechnics will fireplace blades to sever the Nylon cords connecting the rover to its descent stage, which is able to propel itself a protected distance away earlier than impacting the Martian floor.
This graphic illustrates the parts of the Mars 2020 spacecraft, together with the rover, descent stage, aeroshell and cruise stage. Places for a number of the mission’s cameras used throughout descent to Mars are additionally labeled. Credit score: NASA

Engineers and scientists at JPL will pay attention for indicators from Perseverance all through the entry, descent, and touchdown. The rover is programmed to beam again standing tones by way of a -to-Earth antenna at every milestone.

“We will use these tones to inform us various things like the warmth protect has come off, or one thing like that,” stated Allen Chen, the Perseverance rover’s entry, descent, and touchdown lead at JPL. “Sadly, as soon as we get all the way down to backshell separation, Earth will set under the horizon for Perseverance, so the tones will finish.”

NASA’s Mars Reconnaissance Orbiter will likely be flying over Jezero Crater when Perseverance lands. The long-lived orbiter, about to mark 15 years at Mars, will relay a trickle of information from Perseverance again to Earth in near-real time

“That provides us about about eight kilobits per second of information,” Chen stated. That’s sort of like half the velocity of old skool dial-up in case you, in case you
do not forget that. However that will permit us to see a variety of various things, like what the car is doing … We’ll be capable to see what mode we’re in, the place we predict Perseverance is trying, how briskly we’re going, and the way excessive we’re above the bottom, even the estimate of how a lot gas we have now left as properly.”

NASA’s MAVEN orbiter may even be in vary of Perseverance throughout touchdown, however MAVEN gained’t ship the info it information till a number of hours later.

However not one of the telemetry streams are required for Perseverance to land on Mars. “Perseverance will attempt to land herself, it doesn’t matter what, even when we don’t get any of that information,” Chen stated.

If all goes in line with plan, Perseverance might ship house its first “thumbnail” pictures from its hazard cameras moments after touchdown by means of the MRO radio relay, revealing the of Jezero Crater for the primary time.

“As soon as we do get down safely on the floor, we’re all on the sting of our seats to get these first pictures from Mars,” stated Jennifer Trosper, the rover’s deputy undertaking supervisor at JPL.

NASA’s Odyssey orbiter will fly over Perseverance’s touchdown website about three-and-a-half hours after landing. Odyssey will relay information on the standing of the rover, nevertheless it’s unlikely floor controllers will get contemporary pictures throughout Odyssey’s go, in line with Trosper.

At round 9:30 p.m. EST Thursday (0230 GMT Friday), the European ExoMars Hint Gasoline Orbiter will fly over Jezero Crater. The European orbiter will likely be positioned to relay a considerably increased quantity of information from the rover.

“Hopefully, we’ll be getting some preliminary pictures,” Trosper stated. “These could be the entrance and rear hazcams with the lens covers deployed, as a result of the rover should deployed them by then.”

The ExoMars orbiter might present low-resolution previews of images taken by Perseverance’s touchdown cameras throughout descent, Trosper stated.

Trosper stated the Perseverance rover will unfurl its high-gain communications antenna and launch digital camera lens covers shortly after touchdown, earlier than going to sleep to recharge batteries for added activations within the coming days and weeks.

One necessary activity will likely be to find out the orientation and slope of the rover on Mars. That data will assist floor groups inform Perseverance the place to level its high-bandwidth communications antenna to attach with NASA’s Deep House Community on Earth.

Perseverance may even elevate its distant sensing mast, fitted with a panoramic zoom-capable digital camera, science instrumentation, and a Martian climate station. Then floor crews will command Perseverance to take its first brief check drive, setting the stage for a mission deliberate to final at the least two years in search of indicators of historic Martian life, and amassing rock samples for return to Earth by future spacecraft.

Perseverance may even launch NASA’s Ingenuity helicopter a while within the subsequent few months. The JPL-built rotorcraft would be the first such car to fly by means of the environment of one other planet, and groups plan a number of low-altitude, short-duration check flights earlier than Perseverance continues on with its major mission.

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Comply with Stephen Clark on Twitter: @StephenClark1.



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