
	Where results make sense

Topic: Pioneer anomaly

Related Topics

Pioneer program

Pioneer 11

Pioneer 10

Pioneer plaque

Gravity

Dynamic theory of gravity

Timeline of the Universe

Trajectory

Voyager 2

Celestial mechanics

ESA

Noam Chomsky

Isostasy

Aldebaran

Homo sapiens

In the News (Sun 20 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Pioneer 11 - Wikipedia, the free encyclopedia
		Pioneer 11 was the second mission to investigate Jupiter and the outer solar system and the first to explore the planet Saturn and its main rings.
		Instruments studied the interplanetary and planetary magnetic fields; solar wind properties; cosmic rays; the transition region of the heliosphere; neutral hydrogen abundance; distribution, size, mass, flux, and velocity of dust particles; Jovian aurorae; Jovian radio waves; the atmospheres of planets and satellites; and the surfaces of Jupiter, Saturn, and some of their satellites.
		Analysis of the radio tracking data from the Pioneer 10 and 11 spacecraft at distances between 20–70 AU from the Sun has consistently indicated the presence of an anomalous, small Doppler frequency drift.
	en.wikipedia.org /wiki/Pioneer_11 (802 words)

	Pioneer anomaly - Wikipedia, the free encyclopedia
		The Pioneer anomaly or Pioneer effect refers to the observed deviation from expectations of the trajectories of various unmanned spacecraft visiting the outer solar system, notably Pioneer 10 and 11.
		As of 2005, there is no universally accepted explanation for this phenomenon; while it is possible that the explanation will be prosaic—such as thrust from gas leakage—the possibility of entirely new physics is also being considered.
		A meeting was held at the University of Bremen in 2004 to discuss the Pioneer anomaly.
	en.wikipedia.org /wiki/Pioneer_anomaly (832 words)

	Reference.com/Encyclopedia/Pioneer 10
		The Pioneer 10's weak signal continued to be tracked by the Deep Space Network as part of a new advanced concept study of chaos theory.
		Pioneer 10 is heading in the direction of the star Aldebaran in the constellation Taurus.
		Pioneer 10 was used for target practice and easily destroyed by a Klingon Bird of Prey in the movie Star Trek V: The Final Frontier.
	www.reference.com /browse/wiki/Pioneer_10 (402 words)

	Astronomy News
		Pioneer 10 and 11 were the first probes sent to study the outer planets of the Solar System and Pioneer 10 was the first spacecraft to leave the Solar System.
		The reason for the anomaly may be as mundane as uneven radiation pressure or escaping thruster fuel or it may be as groundbreaking as a clue to completely new physics, perhaps related to dark matter or dark energy.
		Following the general assumption that the Pioneer spacecrafts move geodesically in a spherically symmetric spacetime metric, the researchers derive the metric disturbance that is needed in order to account for the Pioneer anomaly.
	www.activeboard.com /forum.spark?forumID=58381&subForumID=150689&action=viewTopic&commentID=2816290&topicPage= (2184 words)

	Newswise
		Pioneer 10 was officially tracked until March 1997, when it was some six billion miles away from the sun.
		Pioneer 11, due to a radio failure, last sent useful radio Doppler transmissions in October 1990, when it was less than three billion miles from the sun.
		Measurements of both Pioneer craft and Ulysses gave approximately the same answer for the strength of the anomalous acceleration.
	www.newswise.com /articles/view/?id=ODDMOVE.LAL (879 words)

	Guardian Unlimited \| Science \| Slow-down in space
		Pioneer 11's RTG did worse, decaying such that it had to be closed down in 1995.
		Pioneer 10 may be an antique, but it is still providing us with unique data.
		Pioneer 10 is slowing down faster than expected simply based on the gravitational attraction of the sun and planets.
	www.guardian.co.uk /science/story/0,3605,658970,00.html (1037 words)

	[No title]
		Nasa's Pioneer probes are in the grip of a baffling force.
		The central difficulty facing non-mundane explanations of the Pioneer anomaly is that, whatever it is, it has to affect the Pioneers but not the planets.
		Perhaps the most exciting possibility is that the Pioneer anomaly is an effect that will "pop out" of a theory such as string theory that may one day "unify" the fundamental forces of nature.
	www.perceptions.couk.com /uef/ytagen.txt (1316 words)

	Pioneer Anomaly
		Bertolami and J. Paramos, The Pioneer anomaly in the context of the braneworld scenario, Class.
		A.F. Ranada, The Pioneer anomaly as acceleration of the clocks, gr-qc/0410084.
		J.L. Rosales, The Pioneer's Anomalous Doppler Drift as a Berry Phase, gr-qc/0401014.
	www.space-time.info /pioneer/pioanomlit.html (775 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		The Pioneer 11 radio system failed in 1990 when it was about 30 AU away from the Sun, while Pioneer 10 is in better shape and is about 70 AU away from the Sun (and still transmitting!).
		Interestingly, careful and detailed studies of the motion of Pioneer 10 and 11 have revealed that the accelerations of both spacecrafts are anomalous and directed roughly towards the Sun, with magnitude, a_p = (8.7 +/- 1.3) x 10^-8 cm/s^2.
		Study of the anomalous acceleration of Pioneer 10 and 11, by J. Anderson et al.
	www.ph.unimelb.edu.au /~foot/pioneer.html (636 words)

	The Seattle Times: Nation & World: Opening new doors in space
		Some cosmologists even speculate the Pioneer Anomaly might help unravel some of the thorniest problems in theoretical physics, such as the existence of dark matter or mysterious extra-dimensional forces predicted by string theory.
		Pioneer 10 was first to pass the orbit of Pluto.
		But if the anomaly turns out to be real, the story will be as much, if not more, about grinding persistence as the flash of insight that is supposed to be the badge of genius.
	seattletimes.nwsource.com /html/nationworld/2002138196_pioneer02.html (1615 words)

	Scientists ponder the problem with gravity - Space.com - MSNBC.com
		Scientists are quick to suggest the Pioneer anomaly, as they call it, is probably caused by the space probes themselves, perhaps emitting heat or gas.
		He is not paid to work specifically on the problem, so he has to juggle the disturbing thought with his regular research, which involves other aspects of gravity and, significantly, whether theories that explain the glue of the whole universe might one day match neatly with those describing the invisible, subatomic world.
		The drift showed that the Pioneers were being accelerated toward the sun (or, rather, decelerated in their movement away from the Sun) by a tiny but inexplicable amount.
	www.msnbc.msn.com /id/6273955 (1489 words)

	2005 Pioneer Anomaly Conference - What We Do \| The Planetary Society
		In brief, the Pioneer Anomaly is an unexplained deceleration of the spacecraft Pioneer 10 and Pioneer 11 as they exit the solar system.
		The first segment was when the Pioneer 10 spacecraft was in its normal spin state, the middle section is a decline in the spin rate from an unconfirmed cause (an indication of a tank leak is the primary suspect), and the third segment is when the spin rate becomes constant again.
		Its primary mission is to detect gravitational waves, but there was discussion whether the Pioneer anomaly could either be a problem for their measurements, or something that could be detected by their measurements.
	www.planetary.org /programs/projects/pioneer_anomaly/update_200511.html (4262 words)

	Pioneer Anomaly
		The problem with the results with Pioneer 10 and 11 is apparently that this calculated distance is not the same as the distance predicted from other considerations for each trial, which is the same thing as the calculated velocity not being the same as the predicted velocity.
		The difference is such that the velocity of a craft appears to be different than it ought to be, which is cast in terms of acceleration in a direction other than that in which the craft is traveling (i.e.
		By incorporating this into the calculations, it may be possible to resolve the anomaly as being one of current interpretation rather than craft behavior.
	home.earthlink.net /~chkingston/PioneerAnomaly.htm (631 words)

	Pioneer Anomaly (Site not responding. Last check: 2007-11-06)
		This anomaly has also been seen in the Ulysses spacecraft, and possibly also in the Galileo spacecraft, though the data is much more noisy, since these were Jupiter probes, hence much closer to the Sun, where there is a lot more pressure from solar radiation.
		The Viking mission to Mars did not detect the Pioneer anomaly - and it would have, had an acceleration of this magnitude been present, because its radio tracking was incredibly accurate - good to about 12 meters.
		For example, explaining the Pioneer anomaly by the gravitational attraction of dark matter would require more than 0.0003 solar masses of dark matter within 50 AU units of the Sun.
	www.space-time.info /pioneer (457 words)

	The Pioneer Anomaly - Astronomy.com Forums
		Pioneer 10 was launched in 1972 and contact was maintained until 2003.
		Pioneer 11 was launched in 1973 but had troubles and contact was lost in 1995.
		The Pioneer Anomaly is an acceleration toward the Sun.
	www.astronomy.com /ASY/CS/forums/282195/ShowPost.aspx (926 words)

	[FPSPACE] Investigation of the Pioneer Anomaly at ISSI - Meeting in November
		http://www.issi.unibe.ch/teams/Pioneer/ The Pioneer Explorer Collaboration Investigation of the Pioneer Anomaly at ISSI First Team Meeting at ISSI in Bern, Switzerland November 7-11, 2005 Focus: the Pioneer anomaly To date, the Pioneer 10 and 11 spacecraft are the most precisely navigated deep-space vehicles.
		Goal: analysis of the entire Pioneer 10/11 data record The limited data analyzed previously allowed the detection of the anomaly in the Pioneer data, but not a determination of its origin.
		Significance: finding the origin of the Pioneer anomaly This ISSI investigation could lead to a determination of the origin of the anomaly and to a characterization of its physical properties.
	www.friends-partners.org /pipermail/fpspace/2005-October/018015.html (463 words)

	Are the laws of gravity wrong?
		As years passed, and the Pioneer probes moved away from the sun's influence, the anomaly didn't disappear — or change even one iota.
		Though never funded by NASA to work on the anomaly, Turyshev plunged into the project as a volunteer, eventually becoming the Pioneer Anomaly's door-to-door salesman.
		Anderson and his colleagues have known for some time that the only way to prove the anomaly is to duplicate it with another spacecraft.
	www.public.asu.edu /~kevinlg/gravity.htm (2064 words)

	cantonrep.com
		For many years, until overtaken by the speedier Voyager 1, the Pioneers were the farthest venturing man-made objects in space.
		As years passed, and the Pioneer probes moved away from the sun's influence, the anomaly didn't disappear -- or change.
		Pioneer 10 could reach the star Aldebaran in the constellation Taurus in about 2 million years, scientists say.
	www.cantonrep.com /index.php?Category=18&ID=200293&r=0 (1900 words)

	Scientific American: A Force to Reckon With (Site not responding. Last check: 2007-11-06)
		One of the most intriguing mysteries in physics is the "Pioneer anomaly," the slowing down of two spacecraft by an unknown force.
		But determining the force's direction means studying telemetry when the Pioneer craft were closer than 20 astronomical units (1 AU equals the distance between Earth and the sun).
		The telemetry for the early part of the Pioneer missions is available, so the analysis "is a relatively cheap thing to do, and at the very least it will give us more information and perhaps an indication," he remarks.
	www.sciam.com /print_version.cfm?articleID=000BB6BE-A7BA-1330-A54583414B7F0000 (729 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		Pioneer 10 and 11 were launched in 1972 to explore Jupiter and Saturn.
		Sending a mission after the Pioneer craft would allow scientists to confirm whether the Pioneer anomaly is real, and to rule out some of the technological explanations.
		Pioneer 10 was last heard from in early 2003, and is now over 12 billion kilometres away.
	www.nature.com /news/2004/041115/pf/041115-16_pf.html (673 words)

	WorldChanging: Another World Is Here: The Pioneer Anomaly
		Pioneer 10 and Pioneer 11 -- launched in 1972 and 1973 to explore Jupiter and Saturn -- have traveled to the most distant fringes of the solar system.
		The Pioneer Anomaly, as it's called, is one of the biggest physics mysteries around.
		But NASA has pulled funding from further research into the anomaly, and is set to demolish the only computers able to read the data.
	www.worldchanging.com /archives/002775.html (352 words)

	Pioneer Space Probes Unexpectedly Slow Down In Deep Space: Science Fiction in the News (Site not responding. Last check: 2007-11-06)
		Pioneer 10 and 11 were launched in 1972 to explore Jupiter and Saturn; these remarkably successful and durable spacecraft fulfilled the expectations of their designers.
		The last bits of data from Pioneer 10 were received in early 2003 following over 30 years of continuous operation; the spacecraft was 12 billion kilometers from the sun.
		However, some scientists wonder if the Pioneer anomaly may be due to some previously unknown forces that are only noticed outside the solar system.
	www.technovelgy.com /ct/Science-Fiction-News.asp?NewsNum=270 (533 words)

	Universe Today - Is the Kuiper Belt Slowing the Pioneer Spacecraft?
		In ecology a pioneer is a "species establishing itself in a previously barren environment".
		Their deceleration pattern suggests that the source of the anomaly is widespread and constant.
		These two Pioneers are still destined to "settle in unknown or unclaimed territory" as humankind's first emissaries to the stars.
	www.universetoday.com /am/publish/kuiper_belt_slowing_pioneer.html?3032005 (1194 words)

	Re: Pioneer anomaly - Forums powered by UBBThreads™
		Yet, the Pioneer craft are far enough away that the total mass of the Solar System must be influencing the velocity.
		if thye pioneer anomaly is indeed a CONSTANT acceleration it would indicate that it is not caused by a small uncertainty in the mass of the planets, since they are moving, hence their force is changing.
		So, again my point: the pioneer anomaly appears to be a CONSTANT acceleration, so not caused by a uncertainty in the gravity of the solar system.
	uplink.space.com /showflat.php?Board=missions&Number=74346 (1420 words)

	Laputan Logic - The Pioneer Anomaly (Site not responding. Last check: 2007-11-06)
		The LA Times is currently running the best popular account of the Pioneer Anomaly that I have read so far.
		The Anomaly refers to a strange force which is apparently being experienced by the three-decade-old Pioneer space-probes which has been causing them to slow down in a way contrary to what would be predicted by Newton's theory of gravitation (or Einstein's modification).
		This effect, which is felt by both probes (Pioneer 10 and Pioneer 11) which are traveling in opposite directions, has accumulated now to the point where the probes are a quarter of a million miles out from where they should be.
	www.laputanlogic.com /articles/2004/12/023-0001-4859.html (330 words)

	[No title]
		He looked at the two Voyager spacecraft, also exiting the solar system, but says their design involved "numerous attitude-control maneuvers" that "can overwhelm the signal of a small external acceleration." NASA engineers have made their last communications with the Pioneer probes, so the two table-sized robots are carrying the nsolved mystery silently to the stars.
		New mission proposed The Pioneer anomaly was discovered by John Anderson, also of JPL, in the 1980s.
		Drifting journeys The Pioneer anomaly is not actually a measure of how far the Pioneer probes did or didn't travel.
	www.perceptions.couk.com /uef/oldnews1.txt (1135 words)

Try your search on: Qwika (all wikis)