Nasa Bombs the Moon with no Visible Flash

Video Source: JoetheElectrician

A pair of NASA spacecraft smashed into the moon at twice the speed of a bullet, as part of a mission aimed at blasting up signs of water ice.
Pictures of the impact zone were beamed back live to Earth, but the video imagery did not show any signs of a flash.
"It's hard to tell what we saw there," said Michael Bicay, director of science at NASA's Ames Research Center in California.
The first crash took place at 7:31 a.m. ET. That’s when an empty rocket that weighed 2.2 tons hit the crater Cabeus. It was expected to create a crater about 66 feet (20 meters) wide, which is half the length of an Olympic pool. The blast should have kicked up a plume of lunar debris about six miles (10 kilometers) high.
Scientists hoped an analysis of the debris would confirm the theory that water — a key resource if people are going to go back to the moon — is hidden below the barren moonscape.
Trailing behind the rocket was the lunar probe LCROSS, short for Lunar Crater Observation and Sensing Satellite and pronounced L-Cross. For four minutes, the LCROSS shepherding spacecraft sent Earth live pictures of the rocket stage's expected impact zone in multiple wavelengths — and then plunged into the crater itself.
Telescopes focus on crash siteTelescopes around the world — including the orbiting Hubble Space Telescope — aimed their cameras at the moon to capture views of the dust-up.
At least one telescope team, at the MMT Observatory in Arizona, reported spotting a bright debris plume. The visible-light images sent back by LCROSS itself showed no sign of such a plume, although Bicay noted that evidence of a crash did turn up in thermal imagery.
LCROSS project manager Dan Andrews said it was possible that the lighting was bad for the spacecraft's images, and that those images needed to be tweaked to make the debris plume easier to see. The raw images could have been essentially “gray against black,” he said.
“What matters for us is: What is the nature of the stuff that was kicked up going in?” Andrews said. “All nine instruments were working fine and we received good data.”
The data will be analyzed for weeks to come. If the analysis shows no signs of water, that would run counter to recent findings suggesting that lunar soil, also known as regolith, contains more water ice than previously thought.
However, Bicay said there could be other explanations for the absence of a water signal. For example, it may be that the water is unevenly distributed — even within the permanently shadowed polar craters that are thought to be the best prospects for ice mining. Bicay said LCROSS' scientists may have come across a situation familiar to Texas oil wildcatters.
"We may have hit a dry hole rather than a wet hole," he said.
Mission ends after mere monthsLaunched in LCROSS and its bigger rocket stage launched together last June and only separated Thursday night, the last major milestone before the big crash.
The lunar demolition derby was broadcast live on NASA Television and on the Internet. NASA reported that as many as 391,000 Internet users were watching the webcast concurrently. That made it the space agency's third biggest Web video event, behind the space shuttle Discovery's launch and landing in 2005.
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Museums and observatories across the country hosted early-morning LCROSS gatherings, but in most cases, the events didn't live up to advance expectations. At Los Angeles' Griffith Observatory, people who got up early to look for the crash threw confused looks at each other instead.
Telescope demonstrator Jim Mahon called the celestial show "anticlimactic.”
“I was hoping we’d see a flash or a flare,” he said.
The LCROSS probe cost $79 million and was an add-on to a bigger NASA satellite, known as Lunar Reconnaissance Orbiter, which is now circling the moon.

Source: msnbc

How to Watch NASA's Probe Smack the Moon

By Joe RaoSPACE.com Skywatching Columnistposted: 06 October 200903:16 pm ET

Get ready for a unique cosmic collision! Early this coming Friday morning (Oct. 9), NASA's Lunar Crater Observation and Sensing Satellite (LCROSS) will end its mission with a bang — literally.

Currently carrying with it the upper stage of the rocket that launched it on its way to the moon on June 18, the game plan is to send that spent rocket motor on a course to smash into the lunar surface. But just not anywhere on the lunar surface, but to a thoroughly scrutinized crater called Cabeus that lies near the moon's south pole and is enveloped in perpetual darkness. The hoped-for resultant effects will be to find hidden water ice frozen inside the crater.

And for seasoned skywatchers here on Earth, it should also produce a visible cloud of ejected material. However, only knowledgeable amateur astronomers with the right equipment will be a able to detect the event. Others can watch the event live on NASA TV.

Smackdown!

The general belief among astronomers is that over the last few billion years, the moon has been bombarded by countless numbers of comets. The water from most of these comets completely sublimated away but if any settled at the bottom of a crater near the moon's poles, these permanently shadowed regions can keep the water from disappearing, remaining as ice for a very long time.

Cabeus is a relatively flat crater about 60 miles in diameter on the moon's south pole that scientists believe may be one of those special cases that might hold water ice in its perpetually shadowed top soil. NASA initially selected a different target for LCROSS, the nearby crater of Cabeus A, but switched to the larger Cabeus because data suggested it had a higher likelihood of containing hidden water ice.

The impact is scheduled to occur this Friday, Oct. 9 at 11:30 UT. That's 7:30 a.m. EDT; 4:30 a.m. PDT. To convert Universal Time to your local time, go here.

Impact will happen less than 10 hours after the spent LCROSS Centaur rocket motor is released and its Shepherding Spacecraft maneuvers into position to trail the Centaur en route to the lunar surface. The 5,000-pound Centaur, is expected to slam into Cabeus at a sharp angle at a speed of 5,600 mph (9,010 kph).

If all goes according to schedule, the Shepherding vehicle, carrying nine science payloads, will follow the Centaur's plunge into the moon, beaming back data live to the Earth. Like a bullet hitting sand, the Centaur's explosive collision is expected to create a crater roughly 60 or 70 feet wide and perhaps as much as 16 feet deep, in the process dredging up approximately 385 tons of lunar dust and soil — enough to fill nearly 18 school buses. In addition to recording the collision, the Shepherding Satellite will fly through the regolith plume thrown up by the collision, just before it too slams into the lunar surface some four minutes later, kicking up its own smaller plume of debris.

But before it's sacrificed in the cause of science, the 1,500-pound Shepherding Spacecraft will utilize its specialized sensors and will look for water's telltale chemical signature within the larger debris plume created by the Centaur, possibly in the form of ice, hydrocarbons or hydrated materials.

How to watch

NASA wants the amateur astronomer community to join in a "citizen scientist" program. Jennifer Heldmann heads the LCROSS observing campaign. "We would like to have as many eyes and instruments watching the impact as possible because this is the way we'll get the most data and the most information as possible."

Those who live to the west of Mississippi River will have the best opportunity because the sky will still be dark. Those living east of the Mississippi will still have the moon in the sky, but either dawn twilight or — in the case of those living along the Atlantic Seaboard — sunrise will have occurred, making for a much brighter sky background. A dark backdrop will be an important prerequisite, since it's estimated that when the debris plume forms on it will be no brighter than a sixth-magnitude star (the threshold of naked-eye visibility), and quite likely even fainter.

If you want to attempt to see the impact yourself, here are some important points to be aware of:

First, you're going to need a moderately large telescope, somewhere on the order of at least 10 to 12 inches of aperture. Smaller telescopes will probably not be able to do the job and you will definitely not see anything using binoculars. You'll likely need to use magnifications in the 250 to 500-power range to have a legitimate chance of getting a glimpse of the dim impact plume.

Keep in mind that high power dilutes the brightness of an image, as well as aggravates any unsteadiness of detail. As a general rule of thumb that the maximum amount of magnification for any telescope is 50-power per inch of aperture.

"But wait a minute," you may protest, "my telescope comes with a special Barlow lens, that the manufacturer promises will double or even triple the magnification of my eyepiece."

True enough. In fact, that aforementioned 500-power is likely achieved by pushing the scope's highest power eyepiece with that very same Barlow lens, which ultimately will result in a dim, impossibly fuzzy image. If you're a beginner, you need to understand that that using a Barlow lens is similar to enlarging a photograph. The negative — like a telescope's image — contains only so much detail, which can be blown up only so far before all you can see is fuzz! So, if you have a 3-inch department store telescope — even if it is blessed with perfect optics — the claim of 500-power is more than three times the limit of the most practical magnification that it can provide.

The impact will take place at the lunar south pole, or on the lower limb of the moon along the dark portion immediately adjacent to the terminator (the line that separates the illuminated day side and the dark night side of the Moon). Try to keep the very bright sunlit portion of the moon out of the field of view as much as possible.

The plume is expected to be in the shape of a "V" but it will be exceedingly small in size relative to the moon itself. According to NASA's Brian H. Day, the dusty material is only expected to rise about 6 miles (10 km) above the lunar surface. From Earth, that would be equal to about one-quarter of 1 percent of the moon's apparent size or about 5.2 arc seconds.

To try and get an idea of just how large this is, point your telescope toward Jupiter which conveniently shines in the southern part of our current evening sky. Jupiter's disk currently measures 45-arc seconds in diameter; so the dust plume from LCROSS would appear only about 1/9 as large as that!

And the plume — if and when it's visible — will not last very long. The best guesstimates are that it will last no more than 2 minutes.

You can get more detailed viewing tips from NASA here.

Observatories expected to participate in the study include the newly refurbished Hubble Space Telescope, Hawaii's Keck and Gemini telescopes, the Magdelena Ridge and Apache Ridge observatories in New Mexico, the MMT Observatory in Arizona and the Lunar Reconnaissance Orbiter (LRO) now circling the moon.

Lastly, you can watch the event live here on NASA TV, beginning at 6:30 a.m. EDT/3:30 a.m. PDT.

Source: SPACE.com