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Topic: Hill sphere

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	Hill sphere - Wikipedia, the free encyclopedia
		A Hill sphere approximates the gravitational sphere of influence of one astronomical body in the face of perturbations from another heavier body around which it orbits.
		The Hill sphere is the largest sphere, centered at the second body, within which the sum of the three fields is directed towards the second body.
		This expresses the relation in terms of the volume of the Hill sphere compared with the volume of the second body's orbit around the first; specifically, the ratio of the masses is three times the ratio of these two spheres.
	en.wikipedia.org /wiki/Hill_sphere (946 words)

	The Da Vinci Code Secret Item FAQ - IGN FAQs
		SPHERES - Spheres are miniature models of each of the planets, and there are 7 of them to be found.
		Saturn Sphere - It is in the lap of the statue in the middle of the Mona Lisa Room 2.
		Mars Sphere - after you've crawled up out of the elevator and cranked the door open, there is a closet on the same side of the Atrium as the door to the Administration office.
	faqs.ign.com /articles/709/709902p1.html (1368 words)

	Crossings - Volume 4, Issue 1 - Hill
		The Symbiotic Sphere is a multi-modal interface and sculpture in orbit on the ISS designed to interact with and absorb experience (in the form of audio, visual and biomedical information) from the astronauts and cosmonauts.
		Feminised like ships for early navigation, the Symbiotic Sphere is a metallic sphere that embodies the idea of wholeness, peaceful co-existence, perfection, the music of the spheres and a layering of evolutionary and bio-cosmic time.
		The discs serve dual functions: they work as portals for camera and projection hardware inside the sphere and at the same time protect the artwork and the astronauts when the sphere is floating freely in zero gravity inside the space station.
	crossings.tcd.ie /issues/4.1/Hill (2159 words)

	[No title]
		The projected area on the sky covered by the Hill sphere is related to the planet's mass: for Jupiter, Saturn, Uranus and Neptune, these areas are a respectable 48, 22, 6, and 7 square degrees, respectively.
		There are several possible capture mechanisms: involving interactions with the planet's own gaseous nebula7, other objects within the planet's Hill sphere8, and the expansion of the Hill sphere as the planet grows in size9.
		The radius of the Hill sphere is about 65 million km, which is equal to 1,100 Saturn radii, or 0.43 AU (1AU is the mean Earth-Sun distance).
	www.astro.umd.edu /~hamilton/research/preprints/Ham01.txt (1258 words)

	Amateur Astronomers, Inc. - Can an Astronaut Orbit the Space Shuttle?
		She mentioned that the shuttle’s Hill sphere was too small for orbiting to occur.
		The Hill sphere is named for the nineteenth century American celestial mechanics expert, G. Hill (1838 – 1914).
		The Hill sphere formulation is a convenient celestial mechanics method to assess orbiting capability.
	www.asterism.org /tutorials/tut22-1.htm (518 words)

	Curious About Astronomy: Can moons have moons?
		The Moon orbits the Earth because the Moon is 370,000 km from Earth, well within Earth's Hill sphere, which has a radius of 1.5 million km (0.01 AU or 235 Earth radii).
		Loosely speaking, the Hill sphere defines the space where the Earth's gravity is more important than the Sun's gravity on another object.
		The Moon has its own Hill sphere with a radius of 60,000 km (1/6th of the distance between the Earth and Moon) where a sub-satellite could exist.
	curious.astro.cornell.edu /question.php?number=679 (723 words)

	[30.03] Evolution of the Orbits of Extrasolar Planet Moons During Planet Migration (Site not responding. Last check: 2007-11-03)
		Using Hill's approximation, we have integrated orbits of moons as their parent planet migrates inward over a period of approximately 10,000 years.
		In both case, however, the Hill radius shrinks fast enough to leave the moons outside of the Hill sphere.
		In particular, for a moon which begins at 0.1 Hill radii from a Jupiter-like planet (in terms of mass and orbital semi-major axis), prograde moon loss occurs at roughly 1.3 AU from the parent star, while retrograde moons are lost at 0.1 AU.
	www.aas.org /publications/baas/v34n3/dps2002/13.htm (374 words)

	Govardhan Hill Publishing--Weekly Feature
		The spheres are of two types--"one of solid bluish metal with white flecks, and another which is a hollow ball filled with a white spongy center" (Jimison 1982).
		In his letter to us, Marx said that A. Bisschoff, a professor of geology at the University of Potchefstroom, told him that the spheres were "limonite concretions." Limonite is a kind of iron ore. A concretion is a compact, rounded rock mass formed by localized cementation around a nucleus.
		In the absence of a satisfactory natural explanation, the evidence is somewhat mysterious, leaving open the possibility that the South African grooved sphere--found in a mineral deposit 2.8 billion years old--was made by an intelligent being.
	nersp.nerdc.ufl.edu /~ghi/spheres.html (569 words)

	shatters.net :: View topic - Hill spheres
		I made a new version of the hill sphere file that has the spheres orbiting invisbile bodies at the centers of the planets.
		That way, both the hill sphere and the interior files would be able to use them if I name them like centers.ssc, hillsphere.ssc and interior.ssc.
		I'd already put a request for the feature of sphere transparency at the forum - I had planet interior visualisation in mind, but hill spheres would also be a good target.
	www.shatters.net /forum/viewtopic.php?t=2873 (727 words)

	extreme, sports, xtreme, X, bungy, boarding, whitewater (Site not responding. Last check: 2007-11-03)
		The Sphere may not be everybody's idea of an extreme sport, but it certainly gets my adrenaline pumping.
		It was a large field on the side of a hill.
		The Sphere was taken to the top of the hill on a trailer, behind Nae Limits new quad bike and Dave and I went up in the back of the Land Rover.
	www.extremedreams.co.uk /sphere-ing/index.htm (493 words)

	Kepler's Laws
		The Earth would have a larger Hill sphere if it were further from the Sun.
		Jupiter's Hill sphere is huge since it is massive and far from the Sun.
		With initially circular orbits having radii from 90% to 95% of the Hill radius, the sun's gravity causes fluctuations in the semimajor axis length and a rapid procession of its orientation, causing the trace of the test particle's motion over time to resemble one of those designs you might draw with the "spirograph" toy set.
	www.physicsforums.com /showthread.php?p=322848 (1363 words)

	Tvindy: GROW
		I did the same thing, swapped the pipe and hills, and after it was done, i clicked on the location where it tells you what level my pipe was on, and the volcano erupted for an additional 100 points...
		The next three are interchangeable as well (hill ladder pipe) as long as the pipe comes after the hill, the ladder can be used either as #4, or #6.
		It is also possible to win if you put the hill after the pipe, just as long as the hill is there when the bubbles come out, this is the way I won.
	tvindy.typepad.com /tvindy/2004/02/grow.html (2238 words)

	Amazon.com: Masses, Classes and the Public Sphere: Books: Mike Hill,Warren Montag (Site not responding. Last check: 2007-11-03)
		Their point is that in the real world ideas are always linked to economic, political, and/or social interests that embody the threat of force (even if the threat isn't always carried out) and that Habermas is putting an ideological gloss on a system based on coercion.
		Hill's chapter on E.P. Thompson, Louis Althusser, and Adam Smith is similarly strong, while Montag's "The Pressure of the Street" is polemically charged if heavy-handed.
		Jurgen Habermas's introduction of the term "public sphere" today provides a fundamental concept for assessing everything from intellectual debate and "public access" criticism, to the function of race, gender and sexual difference in contemporary civil society.
	www.amazon.com /Masses-Classes-Public-Sphere-Mike/dp/1859847773 (857 words)

	[No title]
		Shot entirely within a domestic interior, Hill documents in real time the objects, spaces, and gestures of the everyday.
		Despite the intrusion of the camera into this private sphere, Hill's focus is on absence and solitude -- the tape unfolds without language or interaction.
		Ultimately, Hill's durational narrative uses the acts of recording and viewing to describe a metaphorical interior space.
	www.eai.org /eai/tape.jsp?itemID=1817 (135 words)

	Kepler's Laws - Page 2
		Here a is the orbital semimajor axis, m is the mass of the smaller body, and M is the mass of the primary.
		I should add that the "Hill sphere" is the zero velocity surface of the conserved "energy function".
		I thought that this was the maximum distance for the longterm stability of a circular orbit against a perturbing mass.
	www.physicsforums.com /showthread.php?p=383553 (3225 words)

	[No title]
		There are two possibilities: (i) the capture happened when gas was filling the whole Hill sphere of the protoplanet (before gap openning) or (ii) there was a rather compact disk around the protoplanet at the time of capture (after gap openning).
		Consider both possibilities: (i) that full Hill sphere of the planet is filled by the gas or (ii) that exists a compact gas disk near the planet.
		A particularly interesting one is to estimate the number of collisions of two planetesimals within a planetary Hill sphere to gain some insight on the efficiency of this mechanism for satellite formation.
	www.boulder.swri.edu /~davidn/satellite/report.html (3584 words)

	Masses, Classes and the Public Sphere
		Jürgen Habermas’s introduction of the term “public sphere” today provides a fundamental concept for assessing everything from intellectual debate and “public access” criticism, to the function of race, gender and sexual difference in contemporary civil society.
		As new demands have been made on the concept, so people have refined and extended them, positing the idea of a plurality of “counter-public spheres” and continually addressing the philosophical concept of the public sphere itself.
		Mike Hill is Assistant Professor of English at the University of Albany, New York, the editor of Whiteness: A Critical Reader and author of Whiteness: Identity, Knowledge, Change (forthcoming).
	www.versobooks.com /books/ghij/h-titles/hill_montag_masses.shtml (192 words)

	sp.html (Site not responding. Last check: 2007-11-03)
		New Sphere Packings in More Than Thirty-Two Dimensions, J. Leech and N. Sloane, Proceedings Second Chapel Hill Conference on Combinatorial Mathematics and its Applications, Univ. of North Carolina, Chapel Hill, NC, 1970, pp.
		Sphere Packings Constructed from BCH and Justesen Codes, N. Sloane, Mathematika, 19 (1972), pp.
		12 and "photos" of the putatively optimal clusters of 4 to 10 and 13 to 20 spheres are in separate files] N.
	www.research.att.com /~njas/doc/sp.html (1581 words)

	Hill Sphere Calculator (Site not responding. Last check: 2007-11-03)
		The Hill Sphere can be approximated with the following formula:
		r is the radius of the Hill Sphere
		M is the mass of the parent body
	orbitsimulator.com /cmc/HillSphere.html (43 words)

	George William Hill - Wikipedia, the free encyclopedia
		George William Hill (March 3, 1838 – April 16, 1914), was a U.S. astronomer and mathematician.
		After attending high school, Hill graduated from Rutgers University in 1859.
		He became president of the American Mathematical Society in 1894, serving for two years.
	en.wikipedia.org /wiki/George_William_Hill (222 words)

	Caltech Press Release, 12/13/2002, Re'em Sari, Peter Goldreich
		Individual objects in the Kuiper belt are thought to have formed in the early solar system by accretion of smaller objects.
		The region where the gravitational influence of a body dominates over the tidal forces of the sun is known as its Hill sphere.
		Such encounters last a couple of centuries and, if no additional process is involved, the "transient binary" dissolves, and the two objects continue on separate orbits around the sun.
	pr.caltech.edu /media/Press_Releases/PR12322.html (827 words)

	BUSINESS & LOBBYING =The Hill.com= (Site not responding. Last check: 2007-11-03)
		Lobbyists often choose to linger around Capitol Hill when a bill is in conference.
		During the first term of the Clinton administration, Simon served as chief domestic advisor to Vice President Al Gore, whom he also served in the Senate as legislative director.
		His time on Capitol Hill also included a stint as staff director of the House Science, Space and Technology Committee’s Investigations Subcommittee.
	www.hillnews.com /business/071603.aspx (489 words)

	MARS HILL AUDIO
		We believe that fulfilling the commands to love God and neighbor requires that we pay careful attention to the neighborhood: that is, every sphere of human life where God is either glorified or despised, where neighbors are either edified or undermined.
		The MARS HILL AUDIO Journal is an "audio magazine" featuring ninety minutes of conversation on each bimonthly cassette, CD, or MP3 edition.
		In each issue we’ll give you a preview of the upcoming issue of the MARS HILL AUDIO Journal, alert you to new essays and articles posted to our extensive online bibliography, and let you know about local and national conferences and other events that may be of interest to our constituency.
	marshillaudio.org (365 words)

	In the thick of the fray -- Bibliography
		Rock Hill Chapter of South Carolina Council on Human Relations Records, Acc.
		Cott, Nancy F. The Bonds of Womanhood: "Woman's Sphere" of Influence in New England, 1780-1835.
		Chapel Hill: The University of North Carolina Press, 1992.
	www.libsci.sc.edu /histories/biographies/frayser/Fray/biblio.html (1101 words)

	About MARS HILL AUDIO
		MARS HILL AUDIO is committed to assisting Christians who desire to move from thoughtless consumption of contemporary culture to a vantage point of thoughtful engagement.
		Each program is ninety minutes long, consisting of ten- to fifteen-minute interviews with a variety of guests on a broad array of topics.
		The MARS HILL AUDIO Journal is currently available on cassette tape for $36 per year, or on CD for $48 per year.
	www.marshillaudio.org /about/aboutmha.asp (240 words)

	APPM 8100 Seminar: Thomas Perkins
		The general mechanism by which the irregular moons of the giant planets were captured is thought first to have involved temporary gravitational trapping within the planet's Hill sphere (a region where planetary gravity dominates solar tides) followed by dissipative energy loss (or planetary growth) to make capture permanent.
		However, the orbital inclination distributions of recently discovered irregular moons cannot be adequately explained using existing theories.
		We argue that irregular moons were captured by first getting entangled in a thin layer of chaos inside the Hill sphere.
	amath.colorado.edu /courses/8100/2003Spr/farrelly.html (219 words)

	[3.11] Gas-accretion flow onto the protoplanet: three-dimensional numerical simulation (Site not responding. Last check: 2007-11-03)
		(1)Out of the Hill sphere: The gas approaching to the planet with Keplerian shear velocity forms a bow shock around the Hill sphere by the planetary gravity.
		The shock surface leans back-ward, so that the almost all gas except around the mid plane gets positive momentum in z-direction when the gas passes the shock.
		(2)The accretion flow into the Hill sphere: On the mid plane, the gas loses its energy on the bow-shock surface and enters the Hill sphere passing around one of the Lagrangian points on the Hill sphere.
	www.aas.org /publications/baas/v33n4/aas199/1311.htm (332 words)

	"Amateur Astronomy". Lagrangian Points (Site not responding. Last check: 2007-11-03)
		L1 and L2 are at the limits of the so-called Hill's sphere, a limit at which Sun and planet's gravity balance each other.
		Beyond, they would be taken away by Sun from the planet; theoretically, retrograde satellites may be hold by the planet's gravity well beyond the Hill's sphere limit.
		L3 is on the other side of the Sun relatively to Earth, at about the same distance than the Earth.
	stars5.netfirms.com /lagrangisp.htm (609 words)

	Cassini-Huygens: Operations-Approach & Phoebe Science Highlights
		At about the spacecraft's closest approach to Phoebe, Cassini will cross the Hill sphere of this icy moon.
		Particles detected inside the Hill sphere most likely originate from the surface of the moon.
		The Cosmic Dust Analyzer (CDA) measurements starting at closest approach to Phoebe will provide important information about the composition of the moon's surface as well as about what processes generate the dust.
	saturn.jpl.nasa.gov /operations/approach-science.cfm (709 words)

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