News From Space: China’s Jade Rabbit Moon Rover

change'e3Earlier this week, China took another step towards becoming a major power in space with the launch of the Chang’e-3 lunar probe. On board this vehicle is the Yu Tu (Jade Rabbit) lunar rover, a vehicle that is designed to deploy from the vehicle once it reaches lunar orbit and explore the surface independently. If all continues to go to plan, the Chang’e-3 will reach the Moon by December 14th, and its arrival will certainly be historic.

For starters, the probe’s landing in Sinus Iridum, a basaltic lava plane in the Moon’s northern hemisphere, will be the first spacecraft to make a soft landing on the Moon in 37 years. In addition, it will the be the first time China has landed a spacecraft and a rover on the Moon. This is the latest in the Chang’e program, a series of robotic and human missions that ultimately seeks to put Chinese cosmonauts on the Moon.

change'e3_2The Chang’e-3 mission incorporates two major components – the Lander and the Jade Rabbit rover, which is named after the companion of the Moon goddess Chang’e in Chinese mythology. The three-stage Chang Zheng 3B (Long March 3B) launch vehicle that is being used to send the Chang’e-3 probe to the Moon is roughly a functional equivalent of SpaceX’s Falcon 9 rocket, the heaviest rocket in their fleet.

After launching on Monday from the Xichang Satellite Launch Centre, the rocket was placed into an Earth-Moon transfer orbit and conducted its first separation. Shortly thereafter, its second stage engines were engaged to effect course corrections and bring the lander and rover into lunar orbit. Then came two crucial burns from the third stage engines, which put the Chang’e-3 probe into a parking and then highly elliptical translunar orbit.

change'e3_3Throughout all this, the probe slept, and will continue to do so until it burns its own engines to enter lunar orbit tomorrow.Then will come the tricky bit, landing safely without any input from controllers on Earth. This requires a combination of inertial guidance, extremely precise range and velocity measurements, image recognition, and a pretty fast computer – not to mention a certain amount of luck.

Once landed, the six-wheeled rover will begin exploring the surface and collecting soil samples for analysis. As with other rovers, energy will be provided by a series of solar panels and information obtained during its mission will be sent back to Earth for further analysis. In addition, real-time video and pictures will be captured by the rover’s arsenal of cameras, all of which will be sent back to Earth and shared via Chinese media outlets.

change'e3_1In addition to being a first for China’s space program, the Jade Rabbit also has the added distinction of being outfitted with what is arguably the most sophisticated scientific equipment of any previous rover. Most notable is a powerful ground-penetrating radar capable of penetrating up to 30 meters (100 ft) of lunar soil or about 100 m (330 ft) of lunar crustal material, and analyzing the underlying structure.

The rover is also equipped with an Alpha Particle X-ray Spectrometer (APXS) that uses particle-induced X-ray emission and X-ray fluorescence to determine the abundance of elements within rock and soil samples. The instrument can also find hidden materials, such as water of crystallization, which is otherwise difficult to detect remotely. Finding water on the Moon is an ongoing objective for space agencies, and crucial to plans for future settlement.

change'e3_4Then there is the Lunar Ultraviolet Telescope (LUT), which is designed to act as the first long-term astronomical observatory to ever be placed on the Moon’s surface. The vacuum environment and slow rotation of the lunar environment make an ideal location for near-UV observations that cannot be carried out from beneath the Earth’s obscuring atmosphere.

Another optical instrument is the Extreme Ultraviolet Camera intended to monitor the Earth’s plasmasphere, which is a magnetically active region within the magnetosphere but above the ionosphere. It works by viewing light with a wavelength of 30.5 nm which is scattered from helium ions in the plasmasphere. The lander is also hosting several other cameras and a lunar soil probe.

china-lunar-lander-rover-launch-jade-rabbit-13As already stated, the landing site for Chang’e-3 is in the general area of Sinus Iridum, a northwestern extension to the Mare Imbrium basaltic plane which is surrounded from the northeast to the southwest by the Montes Jura mountain range. A precise location has not yet been announced by Chinese authorities, but it has been widely speculated that it will take place within the vicinity of crater Laplace A – a crater that is about 9 km in diameter.

This is certainly an exciting time, as we are likely to learn plenty of new things about the Moon in the next few weeks! And in the meantime, be sure to check out this animation of the Change’e-3 entire mission- from launch to touchdown and deployment on the Moon, courtesy of RyukyuSARs:


Sources: gizmag.com, nasaspaceflight.com

Happy Anniversary Curiosity!

curiosity_sol-177-1Two days ago, the Mars Rover known as Curiosity celebrated a full year of being on the Red Planet. And what better way for it to celebrate than to revel in the scientific discoveries the rover has made? In addition to providing NASA scientists with years worth of valuable data, these groundbreaking finds have also demonstrated that Mars could once have supported past life – thereby accomplishing her primary science goal.

And it appears that the best is yet come, with the rover speeding off towards Mount Sharp – the 5.5 km (3.4 mile) high mountain dominating the center of the Gale Crater – which is the rover’s primary destination of the mission. This mountain is believed to contain vast caches of minerals that could potentially support a habitable environment, thus making it a veritable gold mine of scientific data!

curiosity-anniversary-1To take stock of everything Curiosity has accomplished, some numbers need to be tallied. In the course of the past year, Curiosity has transmitted over 190 gigabits of data, captured more than 71,000 images, fired over 75,000 laser shots to investigate the composition of rocks and soil, and drilled into two rocks for sample analysis by the SAM & CheMin labs housed in her belly.

On top of all that, the rover passed the 1 mile (1.6 km) driving mark on August 1st. Granted, Mount Sharp (aka. Aeolis Mons) is still 8 km (5 miles) away and the trip is expected to take a full year. But the rover has had little problems negotiated the terrain at this point, and the potential for finding microbial life on the mountain is likely to make the extended trip worthwhile.

curiosity-anniversary-20But even that doesn’t do the rover’s year of accomplishments and firsts justice. To really take stock of them all, one must consult the long-form list of milestones Curiosity gave us. Here they are, in order of occurrence from landing to the the long trek to Mount Sharp that began last month:

1. The Landing: Curiosity’s entrance to Mars was something truly new and revolutionary. For starters, the distance between Earth and Mars at the time of her arrival was so great that the spacecraft had to make an entirely autonomous landing with mission control acting as a bystander on a 13-minute delay. This led to quite a bit a tension at Mission Control! In addition, Curiosity was protected by a revolutionary heat shield that also acted as a lifting body that allowed the craft to steer itself as it slowed down in the atmosphere. After the aeroshell and heat shield were jettisoned, the rover was lowered by a skycrane, which is a rocket-propelled frame with a winch that dropped Curiosity to the surface.

2. First Laser Test: Though Curiosity underwent many tests during the first three weeks after its landing, by far the most dramatic was the one involving its laser. This single megawatt laser, which was designed to vaporize solid rock and study the resultant plasma with its ChemCab system, is the first of its kind to be used on another planet. The first shot was just a test, but once Curiosity was on the move, it would be used for serious geological studies.Curiosity-Laser-Beam3. First Drive: Granted, Curiosity’s first drive test was more of a parking maneuver, where the rover moved a mere 4.57 m (15 ft), turned 120 degrees and then reversed about 2.4 m (8 feet). This brought it a total of about 6  m (20 ft) from its landing site – now named Bradbury Landing after the late author Ray Bradbury. Still, it was the first test of the rover’s drive system, which is essentially a scaled-up version of the one used by the Sojourn and Opportunity rovers. This consists of six 50 cm (20-in) titanium-spoked aluminum wheels, each with its own electric motor and traction cleats to deal with rough terrain.

4. Streams Human Voice: On August 28, 2012, Curiosity accomplished another historical first when it streamed a human voice from the planet Mars back to Earth across 267 million km (168 million miles). It was a 500 kilobyte audio file containing a prerecorded message of congratulations for the engineers behind Curiosity from NASA administrator Charles Bolden, and demonstrated the challenges of sending radio beams from Earth to distant machines using satellite relays.

curiosity-anniversary-45. Writes a Message: Demonstrating that it can send messages back to Earth through other means than its radio transmitter, the Curiosity’s treads leave indentations in the ground that spell out JPL (Jet Propulsion Lab) in Morse Code for all to see. Apparently, this is not so much a gimmick as a means of keeping track how many times the wheels make a full revolution, thus acting as an odometer rather than a message system.

6. Flexing the Arm: Curiosity’s robotic arm and the tools it wield are part of what make it so popular. But before it could be put to work, it had to tested extensively, which began on August 30th. The tools sported by this 1.88 m (6.2-ft) 33.11kg (73 lb) arm include a drill for boring into rocks and collecting powdered samples, an Alpha Particle X-ray Spectrometer (APXS), a scooping hand called the Collection and Handling for In-Situ Martian Rock Analysis (CHIMRA), the Mars Hand Lens Imager (MAHLI), and the Dust Removal Tool (DRT).

curiosity-alluvialplain7. Discovery of Ancient Stream Bed: Curiosity’s main mission is to seek out areas where life may have once or could still exist. Therefore, the discovery in September of rocky outcroppings that are the remains of an ancient stream bed consisting of water-worn gravel that was washed down from the rim of Gale Crater, was a major achievement. It meant that there was a time when Mars was once a much wetter place, and increases the chances that it once harbored life, and perhaps still does.

8. First Drilling: In February, Curiosity conducted the first robot drill on another planet. Whereas previous rovers have had to settle for samples obtained by scooping and scraping, Curiosity’s drill is capable of rotational and percussive drilling to get beneath the surface. This is good, considering that the intense UV radiation and highly reactive chemicals on the surface of Mars means that finding signs of life requires digging beneath the surface to the protected interior of rock formations.Curiosity_drillings9. Panoramic Self Portrait: If Curiosity has demonstrated one skill over and over, it is the ability to take pictures. This is due to the 17 cameras it has on board, ranging from the black and white navigation cameras to the high-resolution color imagers in the mast. In the first week of February, Curiosity used its Mars Hand Lens Imager to take 130 high-resolution images, which were assembled into a 360⁰ panorama that included a portrait of itself. This was just one of several panoramic shots that Curiosity sent back to Earth, which were not only breathtakingly beautiful, but also provided scientists with a degree of clarity and context that it often lacking from images from unmanned probes. In addition, these self-portraits allow engineers to keep an eye on Curiosity’s physical condition.

10. Long Trek: And last, but not least, on July 4th, Curiosity began a long journey that took it out of the sedimentary outcrop called “Shaler” at Glenelg and began the journey to Mount Sharp which will take up to a year. On July 17, Curiosity passed the one-kilometer mark from Bradbury Landing in its travels, and has now gone more than a mile. Granted, this is still a long way from the breaking the long-distance record, currently held by Opportunity, but it’s a very good start.

curiosity_roadmapSuch was Curiosity’s first 365 days on Mars, in a nutshell. As it enters into its second year, it is expected to make many more finds, ones which are potentially “Earthshaking”, no doubt! What’s more, the findings of the last year have had an emboldening effect on NASA, which recently announced that it would be going ahead with additional missions to Mars.

These include the InSight lander, a robotic craft which will conduct interior studies of the planet that is expected to launch by 2016, and a 2020 rover mission that has yet to be named. In addition, the MAVEN (Mars Atmosphere and Volatile Evolution) orbiter as just arrived intact at the Kennedy Space Center and will be blasting off to the Red Planet on Nov. 18 from the Florida Space Coast atop an Atlas V rocket.

maven_orbitThese missions constitute a major addition to NASA’s ongoing study of Mars and assessing its past, present and future habitability. Between rovers on the ground, interior studies of the surface, and atmospheric surveys conducted by MAVEN and other orbiters, scientists are likely to have a very clear picture as to what happened to Mars atmosphere and climate by the time manned missions begin in 2030.

 

Stay tuned for more discoveries as Curiosity begins its second year of deployment. Chances are, this year’s milestones and finds will make this past years look like an appetizer or a warm-up act. That’s my hope, at any rate. But considering what lies ahead of it, Curiosity is sure to deliver!

In the meantime, enjoy some of these videos provided by NASA. The first shows Curiosity’s SAM instrument singing “happy birthday” to the rover (though perhaps humming would be a more accurate word):


And check out this NASA video that sums up the rover’s first year in just two minutes: