NASA’s Lucy mission launches to Jupiter’s Trojan asteroids: The best way to watch dwell

NASA's Lucy mission to Jupiter's Trojan asteroids: Everything you need to know

Lucy flies over a Trojan asteroid on this NASA animation.

NASA’s Goddard Area Flight Heart

NASA isn’t any stranger to the photo voltaic system’s most mammoth planet, the fuel large Jupiter. Robotic explorers, like Juno, have gazed upon its Nice Pink Spot and analyzed its ambiance. However in its planetary neighbourhood lies a group of historical rocks often called the Trojan asteroids. These rocks are fossils from the earliest period of our photo voltaic system, time capsules locked in a dance across the solar, however we have by no means studied them up shut. That is about to vary. 

Subsequent week, NASA is sending the Lucy spacecraft towards these historical uncooked supplies in an bold and daring decade-long mission to entry our photo voltaic system’s well-preserved historical past.

Completely named for the fossil that taught us about humanity’s genesis, Lucy’s 12-year-long trek guarantees to disclose a cosmic evolutionary report. The spacecraft will catch closeup views of a various choice of Trojan asteroids to assist scientists decipher how and why our photo voltaic system’s planets got here to be. 

Proper now, we all know near nothing about these primitive rocks’ properties. However we have rounded up every little thing we are able to that can assist you put together for the momentous launch.

Cue “Lucy within the sky with diamonds.”

The best way to watch NASA launch the Lucy mission

You may watch the lift-off, at the moment scheduled for Oct. 16 at 2:34 a.m. PT (5:34 a.m. ET), on-line on NASA TV

Be certain to verify again nearer to the large day for clips of the launch on CNET Highlights.

Here is that point all over the world:

Saturday, Oct. 16

  • USA: 2:34 a.m. PT / 5:34 a.m. ET
  • Brazil: 6:34 a.m. Rio
  • UK: 10:34 a.m.
  • South Africa: 11:34 a.m.
  • Russia: 12:34 p.m. (Moscow)
  • UAE: 1:34 p.m. 
  • India: 3:04 p.m.
  • China: 5:34 p.m.
  • Japan: 6:34 p.m.
  • Australia: 8:34 p.m. AEDT

Whilst you wait, let’s dive into why this mission could possibly be world-changing for astronomers.

What are the Trojan asteroids?

Lengthy earlier than planets got here into existence, the photo voltaic system overflowed with trillions of rocky and icy our bodies orbiting a dim solar. A few of these fragments slowly fused collectively to kind bigger planets, such because the Earth and Mars. However alongside the way in which, a bunch of floating rocks have been left over.

Many have been swept into the limitless depths of the universe — taking their secrets and techniques with them — however a smattering nonetheless dwell within the outer reaches of our photo voltaic system.

Caught between the gravitational pull of the solar and of Jupiter are these primitive items of rock which were round for billions of years. They’re often called Jupiter’s Trojan asteroids. NASA aptly refers to them as “time capsules from the beginning of our photo voltaic system,” and so they kind two clusters that share an orbit with the fuel large. Over 7,000 have been detected up to now.

“The stuff that went into rising Jupiter and Saturn at the moment are trapped in these places,” NASA planetary scientist and principal investigator of the Lucy mission, Hal Levison, mentioned within the mission’s overview.

The place does Lucy are available in?

Lucy would be the first spacecraft to asteroid-hop amongst seven of the Trojan asteroids, however earlier than heading to each the main and trailing swarms, it will go to a principal belt asteroid positioned between Mars and Jupiter. 

In inexperienced, you see the main and trailing swarms of Jupiter Trojans. That is the place Lucy is headed.


“We’ll eight never-before-seen asteroids in 12 years with a single spacecraft,” Tom Statler, Lucy challenge scientist at NASA headquarters in Washington mentioned in a assertion. “This can be a implausible alternative for discovery as we probe into our photo voltaic system’s distant previous.”

NASA notes that “no different area mission in historical past has been launched to as many various locations in unbiased orbits round our solar” and that “Lucy will present us, for the primary time, the variety of the primordial our bodies that constructed the planets.” 

The spacecraft will use conventional chemical propulsion expertise that’ll assist with maneuvering, however to avoid wasting gas, it will fly previous factors of curiosity as an alternative of treading slowly. That does not pose a lot of a hindrance, although, as a result of Lucy can nonetheless snap pics and gather spectroscopic data whereas whizzing by.

Mission targets

Armed with a high-gain antenna for communication with Earth; high-tech cameras (colour, in addition to black and white); an infrared spectrometer and thermometer, the spacecraft will take a look at a number of key options of those asteroids by capturing their bodily properties: 

Floor geology: This contains issues like form, crater dimension, crustal construction and layering.

Floor colour and composition: Tones and colours of the rocks, mineral make-up and regolith properties, reminiscent of unfastened soil composition, are a few of these options.

Interiors and bulk properties: Plenty, densities, powder blankets round craters and different nitty gritty particulars comprise this part.

Satellites and rings: A number of of the asteroids might need mini-asteroids orbiting them, as if they’re the middle of their very own photo voltaic system. Some would possibly even have Saturn-like rings consisting of super-small rocks or icy our bodies.


NASA’s Lucy will discover eight asteroids over a dozen years.

Lockheed Martin

Prepping for take-off

It is not straightforward being a NASA probe. 

As a result of Lucy will depend on solar energy for the mission, its arrays — massive sufficient to cowl a five-story constructing — needed to bear intense testing to make sure they will not malfunction throughout spaceflight. They’re so large due to how far the probe will likely be touring from the solar. 


A researcher engaged on Lucy’s photo voltaic panels.

Lockheed Martin

In keeping with NASA, it would take a complete of 20 minutes for these essential photo voltaic panels to increase after launch. “These 20 minutes will decide if the remainder of the 12-year mission will likely be successful,” Levison mentioned in a press release

Mars rovers, reminiscent of Perseverance, have shorter spans of anxiety-inducing moments throughout their EDL section, or entry, descent and touchdown sequence. 

“Mars landers have their seven minutes of terror, now we have this,” Levison remarked.

After a number of iterations of testing, Donya Douglas-Bradshaw, Lucy challenge supervisor from NASA’s Goddard Area Flight Heart in Greenbelt, Maryland, mentioned in a press release that the execution on the bottom was “flawless.” 

Though area is a really totally different enviornment.

On Oct. 16, Lucy will likely be transported to the Automobile Integration Facility on the Cape Canaveral Area Drive Station and “mated” with the United Launch Alliance Atlas V rocket. That rocket will assist Lucy exit Earth’s ambiance. 

Then, Lucy will propel away from our dwelling planet to start the 12-year voyage, swinging across the photo voltaic system, utilizing Earth’s gravity as leverage 3 times throughout the journey.

“Launching a spacecraft is nearly like sending a baby off to varsity — you have accomplished what can for them to get them prepared for that subsequent huge step on their very own,” Levison mentioned.


Lucy stands 13 ft (4 meters), practically absolutely assembled on this photograph.

Lockheed Martin

What is going to occur after the mission is full?

After a dozen years, Lucy will stabilize close to Earth, then campaign as soon as once more to the Trojan asteroid belt. It’s going to be the primary ever spacecraft to journey all the way in which to Jupiter and again dwelling.

Future people will face two choices: gather Lucy as an artifact and convey it right down to Earth, or permit Jupiter to finally fling it into the solar or out of the photo voltaic system. 

To not worry. Lucy’s job will likely be full by then. And maybe our astronomy textbooks will likely be amended with the unprecedented data it delivers dwelling.

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