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BY JUSTIN RAY Follow the return of NASA's Genesis spacecraft with samples of the solar wind!
THURSDAY, SEPTEMBER 9, 2004
0305 GMT (11:05 p.m. EDT Wed.) Foil wrapping was removed from the canister and dirt brushed off before the canister was moved into the cleanroom for analysis of the contents. The Genesis team will begin examining the canister on Thursday morning. The capsule plunged into Earth's atmosphere at 1552:47 GMT (11:52:47 a.m. EDT) and entered the preplanned entry ellipse in the Utah Test & Training Range as predicted. However, the drogue chute and parafoil failed to deploy, causing the craft to smack the ground at a speed of 193 miles per hour. The impact occurred near Granite Peak on a remote portion of the range. No people or structures were anywhere near the area, NASA said. Meanwhile, NASA Administrator Sean O'Keefe released a statement on Wednesday's landing mishap: "We're encouraged by the news out of Utah, despite the hard impact landing of the Genesis Sample Return capsule. The spacecraft was designed in a way to give us the best chance at salvaging the valuable science payload should we suffer a landing like the one we witnessed today. "Our re-entry plan was based on safety, and the choice of Dugway was intentional. While today's developments may be disappointing to some, I know the entire NASA family is thankful no one was injured. "Exploration of the heavens is not an easy task. Our ability to travel throughout our solar system is limited, whether by human tended or robotic craft. Genesis was an experiment to journey far from home and return with new clues and possible answers to some of the fundamental questions regarding the origin of our universe. "With each new mission, we push the frontiers of our knowledge and technology, and we're hopeful that what appears to be a setback, will eventually return some impressive results. After all, this isn't an Olympic event where we're awarded a medal for a perfect landing. Our final achievement will be measured by what we've learned over the entire three- year mission. "Our scientists and engineers across NASA and our Jet Propulsion Laboratory are the best in the world. We will find out what happened to Genesis, and we'll continue our quest to accomplish the goals spelled out in our Vision for Space Exploration."
WEDNESDAY, SEPTEMBER 8, 2004 The Genesis sample return canister, carrying atoms from the sun that were blown into space as part of the solar wind, was to have been plucked out of mid air by a helicopter flown by a Hollywood stunt pilot over the Utah Test and Training Range. But a drogue chute needed to stabilize the craft before deployment of its large parafoil never fired and the craft slammed into the ground at about 193 mph. Video showed the canister half buried in the Utah desert, largely intact. It was carrying 20 to 30 micrograms of solar wind material, the equivalent of a few grains of salt. The atoms were embedded in fragile glass-like wafers. Read our full updated story.
2004 GMT (3:04 p.m. EDT) Workers will try to man-handle the craft into a cargo net for transport. If that is unsuccessful, they will attempt to extract the solar wind canister out of the capsule.
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1853 GMT (2:53 p.m. EDT) The capsule must be dug out of the ground. It will be decided later whether to remove the internal science canister holding the solar wind samples or attempt to keep the capsule in one piece to be ferried to nearby facilities.
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1847 GMT (2:47 p.m. EDT) The chute deployment mortar did not fire. The capsule is "slightly breached" by a few inches from the impact, he said. The science portion of the capsule containing the solar wind samples appeared breach too.
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1730 GMT (1:30 p.m. EDT) Project managers are monitoring the temperature of the battery inside Genesis' sample return capsule to make sure that long-term heating does not impair its performance when the capsule returns to Earth in September 2004. Although the battery is likely to become hotter than originally expected, the flight team has a number of options for managing the battery's temperature, and they do not expect the issue to affect the mission.
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1633 GMT (12:33 p.m. EDT) NASA has ended its live video feed from the landing site. We will post additional information as it becomes available. A news conference is coming up later today.
1630 GMT (12:30 p.m. EDT) NASA plans to hold a news conference later this afternoon.
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1620 GMT (12:20 p.m. EDT) Just over two minutes since entry interface the capsule would be at an altitude of 108,000 feet as a mortar aboard the capsule fired, releasing the 6.7-foot drogue parachute to provide stability to the capsule until the main chute is released. The capsule's heat shield will rapidly cool during this subsonic portion of the descent. About four minutes later, three pyrotechnic bolts were to release the drogue chute from the capsule at an altitude of about 22,000 feet. As the drogue chute moved away, it would extract the capsule's main chute, a 34.6- by 12.1-foot parafoil. Full inflation of the parafoil would occur in about 6 seconds. Once inflation is complete, the parafoil and its payload will begin a slow, loose spiral descent through the skies of the Utah Test & Training Range. However, the capsule was in a tumble and none of the chutes deployed to slow the capsule. That thwarted any mid-air recovery.
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1555 GMT (11:55 a.m. EDT) Slightly over 10 seconds later, the capsule will be exposed to about 30 G's, the greatest deceleration it will endure during Earth entry. During this time period, the capsule's heat shield will lose an estimated about 7 pounds, or about 6 percent of its weight, as a small amount of the ablative material erodes away with the heat generated during entry through the atmosphere.
1554 GMT (11:54 a.m. EDT) The Genesis sample return capsule has hit the upper fringes of Earth's atmosphere 400,000 feet above the planet for its trek home. The capsule contains samples of the solar wind that were collected a million miles from Earth during the three-year Genesis mission. About 45 seconds after entry interface, the capsule will be exposed to a deceleration force three times the force of Earth gravity, or 3 G's. This arms a timer that is started when the deceleration force passes back down through 3 G's. All of the parachute releases are initiated from this timer.
1550 GMT (11:50 a.m. EDT) As the capsule descends through the atmosphere, it will be "painted" by powerful radars located on the Utah Test & Training Range. This will provide tracking information allowing ground-based cameras to spot the capsule. Backup tracking is provided by a Global Positioning System unit on the Genesis capsule that transmits position data to a ground station, which in turn relays the information to the mission control center. The radar, visual and GPS data will provide an accurate plot in three dimensions for the capsule's location. This plot is generated at the mission control center located about 100 miles away from the range at Hill Air Force Base. A ground control intercept officer based at the Hill Air Force Base mission control will direct helicopter flight crews towards the capsule.
1545 GMT (11:45 a.m. EDT) Genesis will be stabilize with its nose down because of the location of its center of gravity, its spin rate and its aerodynamic shape.
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1500 GMT (11:00 a.m. EDT) Mission navigators expect the capsule to hit the top of Earth's atmosphere at an altitude of 400,000 feet around 1555 GMT (11:55 a.m. EDT). The target "keyhole" is roughly 20.5 miles long and 6.2 miles wide over the Pacific Ocean. If the capsule enters the atmosphere anywhere inside this corridor, it will come down over the designated spot on the Utah Test & Training Range, NASA says. After its fiery plunge through the atmosphere, a series of chute and a large parafoil will slow the capsule in preparation for a mid-air recovery by a helicopter.
TUESDAY, SEPTEMBER 7, 2004 The $260 million mission will bring back tiny particles that streamed from the Sun, allowing scientists to determine what was in the cloud of gas and dust from which the solar system formed 4.5 billion years ago. The Genesis sample return capsule will enter Earth's atmosphere at 1555 GMT (11:55 a.m. EDT) over Oregon. Two minutes and one time zone later, the capsule will deploy its drogue parachute at 108,000 feet over the vast alkali flats and sagebrush of the U.S. Air Force's Utah Test and Training Range. Waiting 97,000 feet below will be two helicopters and crew bearing the space-age equivalent of a fisherman's rod-and-reel, as NASA puts it. "From the time the drogue deploys it will take about 18 minutes for the capsule to reach a height where we can get to it," said Genesis prime pilot Cliff Fleming of South Coast Helicopters, Santa Ana, Calif. "When we are up there that may feel like a long 18 minutes but we have been training for this moment since 1999, so in the grand scheme of things another quarter-hour or so shouldn't matter much." An important milestone in the mission was met Monday, when the Genesis spacecraft performed its final trajectory maneuver before capsule release. The spacecraft passed the Earth-Moon orbit at about 0900 GMT (8 a.m. EDT) Monday, traveling at about 2,700 miles per hour. "Our Deep Space Network is allowing us to keep a close eye on our spacecraft and its samples of the Sun," said Genesis project manager Don Sweetnam of NASA's Jet Propulsion Laboratory in Pasadena, Calif. "It is right where we planned it to be. Everything is go. The navigators and engineers here at JPL are go, and the recovery team out in Utah is go, too." Genesis is NASA's first sample return mission since Apollo 17 returned the last of America's lunar samples to Earth in December 1972. According to current models, the solar system formed when a massive cloud of gas and dust collapsed under its own gravity. Most of this mass went into what became the Sun, while other gravitational disturbances in the collapsing nebula led to the formation of smaller bodies that eventually became planets, moons, asteroids, and comets. For years, scientists have sought to determine the composition of that original nebula and compare it to the composition of other solar system bodies to see how those bodies have evolved over time. The best way to do this is to study the composition of the Sun which, given its huge mass, is the body most likely to have retained its original composition. Scientists have already determined the Sun's composition to some by looking for the unique spectral signatures of elements embedded in sunlight. However, even the best spectroscopic observations do not provide planetary scientists with the precision they need to compare the Sun's composition with that of other solar system bodies. To accomplish this scientists need actual samples of the Sun they can study in the lab. While a mission to the Sun itself to obtain samples is not technically feasible, there is a far easier and less expensive alternative. The Sun emits a steady stream of particles known as the solar wind, made of material from the Sun's upper atmosphere. By collecting samples of the solar wind, one is essentially capturing the same material that made up the protosolar nebula. To accomplish this, Genesis launched in August 2001 and flew to the Earth-Sun L1 Lagrange point, about 1 million miles sunward of the Earth. This location, a common place for stationing spacecraft that study the Sun, is also free of the Earth's magnetic field, allowing Genesis to study the solar wind without interference. Genesis spent about two and a half years there, completing wide, looping halo orbits of L1. While there, the spacecraft deployed several ultra-pure wafers of gold, sapphire, silicon and diamond that were designed to capture particles entrained in the solar wind. Different collectors were to be used depending on whether the solar wind is fast or slow, or if a coronal mass ejection -- a type of solar storm -- is taking place. Ion and electron detectors on the spacecraft categorized the nature of the solar wind and determined what collector arrays should be deployed at a given time. In addition to the collector arrays, Genesis also carried a solar wind concentrator. This concentrator was designed to increase the concentration of oxygen and nitrogen ions collected by the spacecraft. Oxygen is of particular interest to scientists because they have measured different ratios of the most common oxygen isotope, O16, to two heavier versions, O17 and O18, on different solar system bodies, but do not know what the original oxygen isotope ratios were in the protosolar nebula. After completing its collection of the solar wind, Genesis left its L1 halo orbit in April. The spacecraft performed a distant flyby of the Earth and then circled the Earth-Sun L2 point, behind the Earth, to set up for a daytime reentry over the western U.S. Before it could touch down on Earth, however, the capsule will be captured in mid-air by helicopter so that the impact of landing does not damage the solar wind samples. Once on Earth, the samples will be taken to a special facility at NASA's Johnson Space Center, where scientists will study them with advanced laboratory equipment to determine their composition and draw conclusions about what was in the protosolar nebula. Scientists have high hopes that the solar wind returned by Genesis will help them resolve some key mysteries about the solar system. "Genesis will return a small but precious amount of data crucial to our knowledge of the Sun and the formation of our solar system," said Donald Burnett, principal investigator of Genesis. "Data from Genesis will provide critical pieces for theories about the birth of the Sun and planets." |
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