NASA’s Unprecedented Science Twins are GO to Orbit our Moon on New Year’s Eve

by Ken Kremer on December 29, 2011

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Twin GRAIL Probes are GO for Lunar Orbit Insertion on New Year’s Eve and New Year’s Day
GRAIL probes use precision formation-flying technique to map Lunar Gravity. The twin GRAIL spacecraft will map the moon's gravity field, as depicted in this artist's rendering. Radio signals traveling between the two spacecraft provide scientists the exact measurements required as well as flow of information not interrupted when the spacecraft are at the lunar farside, not seen from Earth. The result should be the most accurate gravity map of the moon ever made. The mission also will answer longstanding questions about Earth's moon, including the size of a possible inner core, and it should provide scientists with a better understanding of how Earth and other rocky planets in the solar system formed. Credit: NASA/JPL-Caltech

In less than three days, NASA will deliver a double barreled New Year’s package to our Moon when an unprecedented pair of science satellites fire up their critical braking thrusters for insertion into lunar orbit on New Year’s Eve and New Year’s Day.

NASA’s dynamic duo of GRAIL probes are “GO” for Lunar Orbit Insertion said the mission team at a briefing for reporters today, Dec. 28. GRAIL’s goal is to exquisitely map the moons interior from the gritty outer crust to the depths of the mysterious core with unparalled precision.

“GRAIL is a Journey to the Center of the Moon”, said Maria Zuber, GRAIL principal investigator from the Massachusetts Institute of Technology (MIT) in Cambridge at the press briefing.

This newfound knowledge will fundamentally alter our understanding of how the moon and other rocky bodies in our solar system – including Earth – formed and evolved over 4.5 Billion years time.

After a three month voyage of more than 2.5 million miles (4 million kilometers) since launching from Florida on Sept. 10, 2011, NASA’s twin GRAIL spacecraft, dubbed Grail-A and GRAIL-B, are now on final approach and are rapidly closing in on the Moon following a trajectory that will hurl them low over the south pole and into an initially near polar elliptical lunar orbit lasting 11.5 hours.

GRAIL's trajectory to moon since Sept. 10, 2011 blastoff
Credit: NASA/JPL-Caltech

As of today, Dec. 28, GRAIL-A is 65,860 miles (106,000 kilometers) from the moon and closing at a speed of 745 mph (1,200 kph). GRAIL-B is 79,540 miles (128,000 kilometers) from the moon and closing at a speed of 763 mph (1,228 kph).

The lunar bound probes are formally named Gravity Recovery And Interior Laboratory (GRAIL) and each one is the size of a washing machine.

The long-duration trajectory was actually beneficial to the mission controllers and the science team because it permitted more time to assess the spacecraft’s health and check out the probes single science instrument – the Ultra Stable Oscillator – and allow it to equilibrate to a stable operating temperature long before it starts making the crucial science measurements.

NASA’s twin GRAIL A & B Moon mapping probes
The GRAIL satellites are now streaking to the Moon and their arrival for orbit insertion is just days away and hours apart on New Year’s Eve and New Year’s Day 2012. This picture shows how they looked, mounted side by side, during launch preparations inside the clean room at Astrotech Space Operations facility in Florida prior to blasting off for the Moon on Sept. 10, 2011 from Cape Canaveral, Florida. Credit: Ken Kremer

The duo will arrive 25 hours apart and be placed into orbit starting at 1:21 p.m. PST (4:21 p.m. EST) for GRAIL-A on Dec. 31, and 2:05 p.m. PST (5:05 p.m. EST) on Jan. 1 for GRAIL-B, said David Lehman, project manager for GRAIL at NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, Calif.

“The GRAIL A burn will last 40 minutes and the GRAIL-B burn will last 38 minutes. One hour after the burn we will know the results and make an announcement,” Lehman explained.

The thrusters must fire on time and for the full duration for the probes to achieve orbit. The braking maneuver is preprogrammed and done completely automatically.

Over the next few weeks, the altitude of the spacecraft will be gradually lowered to 34 miles (55 kilometers) into a near-polar, near-circular orbit with an orbital period of two hours. The science phase will then begin in March 2012.

“So far there have been over 100 missions to the Moon and hundreds of pounds of rock have been returned. But there is still a lot we don’t know about the Moon even after the Apollo lunar landings,” explained Zuber.

“We don’t know why the near side of the Moon is different from the far side. In fact we know more about Mars than the Moon.”

GRAIL’s science collection phase will last 82 days. The two spacecraft will transmit radio signals that will precisely measure the distance between them to within a few microns, less than the width of a human hair.

Artist concept of twin GRAIL spacecraft flying in tandem orbits around the moon to measure its gravity field in unprecedented detail. Credit: NASA/JPL

As they orbit in tandem, the moons gravity will change – increasing and decreasing due to the influence of both visible surface features such as mountains and craters and unknown concentrations of masses hidden beneath the lunar surface. This will cause the relative velocity and the distance between the probes to change.

The resulting data will be translated into a high-resolution map of the Moon’s gravitational field and also enable determinations of the moon’s inner composition.

The GRAIL mission may be extended for another 6 months if the solar powered probes survive a power draining and potentially deadly lunar eclipse due in June 2012.

Engineers would significantly lower the orbit to an altitude of barely 15 to 20 miles above the surface to gain even further insights into the lunar interior.

The twin probes are also equipped with 4 cameras each – named MoonKAM – that will be used by middle school students to photograph student selected targets.

The MoonKAM project is led Dr. Sally Ride, America’s first woman astronaut as a way to motivate kids to study math and science.

JPL manages the GRAIL mission for NASA.

Stay tuned for Universe Today updates amidst the News Year’s festivities.

Blastoff of twin GRAIL A and B lunar gravity mapping spacecraft on a Delta II Heavy rocket on Sept. 10 from Pad 17B Cape Canaveral Air Force Station in Florida at 9:08 a.m. EDT. Credit: Ken Kremer

Read continuing features about GRAIL by Ken Kremer here:
Student Alert: GRAIL Naming Contest – Essay Deadline November 11
GRAIL Lunar Blastoff Gallery
GRAIL Twins Awesome Launch Videos – A Journey to the Center of the Moon
NASA launches Twin Lunar Probes to Unravel Moons Core
GRAIL Unveiled for Lunar Science Trek — Launch Reset to Sept. 10
Last Delta II Rocket to Launch Extraordinary Journey to the Center of the Moon on Sept. 8
NASAs Lunar Mapping Duo Encapsulated and Ready for Sept. 8 Liftoff
GRAIL Lunar Twins Mated to Delta Rocket at Launch Pad
GRAIL Twins ready for NASA Science Expedition to the Moon: Photo Gallery

About 

Dr. Ken Kremer is a speaker, scientist, freelance science journalist (Princeton, NJ) and photographer whose articles, space exploration images and Mars mosaics have appeared in magazines, books, websites and calanders including Astronomy Picture of the Day, NBC, BBC, SPACE.com, Spaceflight Now and the covers of Aviation Week & Space Technology, Spaceflight and the Explorers Club magazines. Ken has presented at numerous educational institutions, civic & religious organizations, museums and astronomy clubs. Ken has reported first hand from the Kennedy Space Center, Cape Canaveral and NASA Wallops on over 40 launches including 8 shuttle launches. He lectures on both Human and Robotic spaceflight - www.kenkremer.com. Follow Ken on Facebook and Twitter

Andrey December 29, 2011 at 4:50 AM

they told him to draw… and he drew a smiley face..

Torbjörn Larsson December 29, 2011 at 12:33 PM
Torbjörn Larsson December 29, 2011 at 12:42 PM

I am fairly excited about this. The Moon is our best shot of understanding Earth, and together to understand terrestrials. While we no doubt need info from other bodies involved in planetary formation like the ongoing Vesta investigation, this is the easiest accessible core [sic!] of it all.

It’s a bummer that lunar eclipses are so common as to make science harder. But I note that, in the context of the recent article touching Rare Earth topics here at UT, this invalidates the creationist proposal that we are situated in the best possible observation spot.

liberty_rocks December 29, 2011 at 4:04 PM

Why do you bother refuting fantasy. At the length truth will out

Torbjörn Larsson December 29, 2011 at 10:51 PM

I’m not sure I understand what you are getting at.

Creationism is a problem for education and acceptance of science, and overt religion is often espoused on science blogs. So of course I act and react at times as a strategy and also from time to time as a tactic to remain sane in the face of insanity. I also laugh a lot at the absurdities claimed, I am happy to report. =D

If you mean that facts will eventually make themselves heard, that seems to be the case. But there are never any guarantees. Science, like democracy, needs to be won for every generation.

Torbjörn Larsson December 29, 2011 at 3:44 PM

The Planetary Society’s blog has an article by Lakdawalla informed by her planetary science skilz on why the probes may survive the eclipse and how that will change the conformation.

And more importantly how the closer extended mission will be able to look at smaller, smoother craters to understand the larger, central peaked and walled ones.

Anonymous December 29, 2011 at 4:39 PM

If these were russian crafts they would crash into the moon.

Anonymous December 29, 2011 at 5:10 PM

Is this necessary?

Anonymous December 29, 2011 at 5:13 PM

Historically, Russian lunar programs have been quite successful actually – it’s just their Mars programs that are cursed.

The Soviet Union sent 15 successful missions to the Moon. Most of those that failed were launch failures – failures of the rockets themselves, not the spacecraft.

Jordi Guim December 29, 2011 at 5:08 PM

Exciting!
I dream of the monolith
2001: A Space Odyssey

Anonymous December 29, 2011 at 6:08 PM

SciFi short story subject: The GRAIL mission enters it’s science orbit and immediately begins measurements. A month after one of the team scientists reports a recurring gravitational anomaly below the crater Ptolemaeus. The signature indicates a large metallic object is buried just below the surface. On the surface above this feature are a group of indecipherable symmetrical bumps.

What’s ‘funny’ about this is that whenever either satellite passes over the area… the radio frequency shifts far higher and begins a series of cascading modulations. One scientist says it sounds like an ocean wave breaking or the rumble of heavy equipment… another says he thinks he sees a pattern in the modulations.

Torbjörn Larsson December 29, 2011 at 10:58 PM

From the GRAIL mission to the grail of emission.

Anonymous December 29, 2011 at 11:44 PM

Ahem… I like SciFi….. Over the period of a year the modulations transform into a distinct pattern. Now, instead of random ‘white noise’ it is determined that the modulations are carrying of bundles of information in the far petabyte range. Some signals are accompanied by X-ray emissions with data rates beyond known frequencies. The source of these emissions are completely baffling the scientific community.

This just in…. NASA has lost com links with both satellites…..

Anonymous December 30, 2011 at 12:39 AM

Let the science begin! HO!~

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