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Topic: Apoapsis

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	apoapsis (Site not responding. Last check: 2007-07-20)
		Given two objects of which one orbits the other, for example a planet and a satellite, apoapsis is the point in the satellite's orbit which is furthest (at the greatest distance) from the planet.
		The point of the closest approach is the periapsis.
		According to Kepler's laws of planetary motion; as a planet travels in an elliptical orbit, around a star; as the planet approaches the apoapsis, it will decrease in velocity.
	www.yourencyclopedia.net /Apoapsis.html (155 words)

	Apsis - Open Encyclopedia (Site not responding. Last check: 2007-07-20)
		In astronomy, an apsis (plural apsides "ap-si-deez") is the point of greatest or least distance of the elliptical orbit of a celestial body from its centre of attraction (the centre of mass of the system).
		The point of closest approach is called the periapsis and the point of farthest approach is the apoapsis.
		A straight line drawn through the periapsis and apoapsis is the line of apsides.
	open-encyclopedia.com /Aphelion (396 words)

	MGS Status
		There was 1 corridor control maneuver executed on the apoapsis portion of orbit 764 to raise periapsis and lower the drag force.
		There was 1 corridor control maneuver executed on the apoapsis portion of orbit 747 to raise periapsis and lower the drag force.
		One Immediate Action maneuver was required on the apoapsis portion of orbit 615 due to an alarm of the -Y solar array yoke structural frequency.
	mars.sgi.com /mgs/status/reports/msop-mgs98.html (13978 words)

	MGS Status (Site not responding. Last check: 2007-07-20)
		The predicted apoapsis height was 486.2 kilometers verses an expected actual height of 491 kilometers, which represents a difference of approximately 5 kilometers.
		This morning it was determined that the spacecraft had achieved a higher than expected degree of apoapsis decay and therefore the schedule ABM maneuver for Apoapsis 1104 was canceled.
		Currently the rate of apoapsis decay is 0.3 km/rev under the planned baseline rate of 14.4 kilometers per revolution.
	mars.jpl.nasa.gov /mgs/status/reports/mgs-AB.html (5417 words)

	Apsis
		In astronomy, an apsis (plural apsides) is the point of greatest or least distance of the elliptical orbit of a celestial body from a center of attraction.
		A straight line drawn through the periapsis and apoapsis is the line of apsides, sometimes called the major-axis of the ellipse.
		According to Kepler's laws of planetary motion, as a body approaches the periapsis it will increase in velocity and as a body approaches the apoapsis it will decrease in velocity.
	www.sciencedaily.com /encyclopedia/apsis (207 words)

	Apoapsis launches new software products at Webcom2001 : E-consultancy.com
		Apoapsis launched a third new product on the software market this week with the first showing of its Broadcast Manager application at WebCom2001.
		The number of large screen monitors that you can configure centrally to convey different messages is literally limitless, and already a major global investment bank is ready to deploy it across their trading floors.
		Established in April 2000, Apoapsis was founded with the aim of improving business performance and empowering personal productivity by delivering innovative, real and practical cost saving IT solutions to customers.
	www.e-consultancy.com /newsfeatures/28775/apoapsis-launches-new-software-products-at-webcom2001.html (611 words)

	Gravel - Calculate elliptical orbit speed at apoapsis and periapsis (Site not responding. Last check: 2007-07-20)
		Va is the (relative) velocity at the apoapsis.
		M is the mass of the object being orbited (this is assumed to be far greater than the mass of the satellite).
		Ra is the maximum radius (apoapsis) of the satellite's orbit.
	www.rclsoftware.org.uk /gravel/orbits.html (181 words)

	Basics of Space Flight Section I. The Environment of Space
		Vanguard-1, by the way, has an orbital period of 134.2 minutes, with its periapsis altitude of 654 km, and apoapsis altitude of 3969 km.
		And of course, as seen in these cartoons, the opposite is true: if you decrease energy when you're at apoapsis, you'll lower the periapsis altitude.
		In practice, you can remove energy from a spacecraft's orbit at periapsis by firing the onboard rocket thrusters there and using up more propellant, or by intentionally and carefully dipping into the planet's atmosphere to use frictional drag.
	www2.jpl.nasa.gov /basics/bsf3-4.html (1216 words)

	The Planetary Society Presents: Cassini, Day By Day (Site not responding. Last check: 2007-07-20)
		Each orbit of the Cassini spacecraft, apoapsis to apoapsis, is designed for a specific kind of Saturn science.
		Apoapsis: 13:12, 17 Jun 2005 (40.7 Rs, inc. 21.8°, phase 66°)
		Apoapsis: 07:02, 31 Dec 2004 (59.6 Rs, inc. 5.3°, phase 72°)
	planetary.org /saturn/daybyday (1040 words)

	Build Your Own Solar Sail Spacecraft Scale Model
		When the spacecraft is out near apoapsis, it can "tack" like a sailboat does, by articulating the sail blades to glancing angle, and increasing its orbital speed slightly.
		Near apoapsis, the spacecraft will alter the angle of each of its blades to a glancing angle, causing the solar "push" to help speed up the spacecraft in its orbit as it passes through apoapsis.
		From there, the same techniques would be able to change apoapsis and/or pariapsis altitude, achieving trajectories to take the sailcraft to other planets and beyond.
	www.spacecraftkits.com /cosmos1/onorbit.html (680 words)

	Navigation History
		These are classical, osculating orbit elements at periapsis (perifocus) and apoapsis (apofocus) with the epochs in ephemeris time (ET).
		See key for definition of data and example data.
		ORBITAL PARAMETERS AT APOAPSIS - (optg.Apoapsis_Web.tbl.gz 1,917 KB)
	mars3.jpl.nasa.gov /mgs/status/nav/navhist.html (495 words)

	Math words page 15
		The word apside, and its related terms apoapsis and periapsis are most commonly applied to conic sections, particularly the ellipse.
		The term apside can actually be applied to any motion in reference to a fixed reference point, and refers to a point on the orbit where, for at least an instant, the point is neither approaching nor receding from the reference point.
		In an ellipse the distance from a focus to the nearest vertex is called apoapsis.
	www.pballew.net /arithm15.html (4028 words)

	The Muse at Sunset: Nihilism? Or apoapsis of rationalism?
		(Apoapsis is the farthest point of an object in an elliptical orbit.)
		Due to AC, Lynn, and Fred, I have been steered to this post at Promethean Antagonist, concerning musical nihilism.
		This is a paragraph of text that could go in the sidebar.
	themuseatsunset.blogspot.com /2004/12/nihilism-or-apoapsis-of-rationalism.html (1957 words)

	The Nine Planets Glossary
		Equivalently the eccentricity is (ra-rp)/(ra+rp) where ra is the apoapsis distance and rp is the periapsis distance.
		The semimajor axis of a planetary orbit is also the average distance from the planet to its primary.
		The periapsis and apoapsis distances can be calculated from the semimajor axis and the eccentricity by rp = a(1-e) and ra = a(1+e).
	www.nineplanets.org /help.html (4842 words)

	- Orbiter
		When you and the apoapsis is out of the earth's atmosphere, then you can cut all
		Its saying when the apoapsis reaches a DISTANCE and NOT when you reach it.
		as you reach your apoapsis (see ApT, when it is 0), this phase is not required.
	orbiter.dansteph.com /forum/read.php?f=1&i=10242&t=10242 (581 words)

	Learn more about Apoapsis in the online encyclopedia. (Site not responding. Last check: 2007-07-20)
		Learn more about Apoapsis in the online encyclopedia.
		Hint: Play with putting spaces before and after your words to see the different results you get.
		According to Kepler's laws of planetary motion; as a planet travels in an elliptical orbit, around a star; as the planet approaches the apoapsis, it will decrease in velocity.\n
	www.onlineencyclopedia.org /a/ap/apoapsis.html (195 words)

	Space & astronomy - mars rovers life expectancy
		solar energy reaching the ground on Mars between periapsis and apoapsis
		I think I read that, at apoapsis, Mars gets something
		the movement of the planet from periapsis to apoapsis.
	www.spacebanter.com /printthread.php?t=138 (1048 words)

	Galileo Orbital Elements
		The general pattern for the tour elements is one set of Jupiter-centered elements from Jupiter apoapsis to the next targeted satellite, a satellite-centered state for the satellite encounter, and a Jupiter-centered state from satellite encounter to Jupiter apoapsis.
		Throughout the tour element sets, the reference to apoapsis refers to the apoapsis following the targeted satellite encounter.
		There is no targeted satellite on orbit five (phasing orbit for solar conjunction) so the elements are valid from apoapsis to apoapsis.
	www.planet4589.org /space/jsr/notes/orbital.html (1060 words)

	Basics of Space Flight Section I. The Environment of Space
		Adding energy at apoapsis will increase periapsis altitude.
		Removing energy at apoapsis will decrease periapsis altitude.
		Removing energy at apochron will decrease perichron altitude.
	www2.jpl.nasa.gov /basics/quiz-9.html (94 words)

	Schoolforge News-Journal - Mars (Site not responding. Last check: 2007-07-20)
		During the periapsis atmospheric passes, the spacecraft velocity was slightly reduced because of drag.
		This effect also caused the spacecraft to decrease its apoapsis altitude.
		MGS was to use this aerobraking technique over a period of four months to lower the high point of its orbit from 56,000 km to near 400 km in altitude.
	opensourceschools.org /article.php?story=20030421045650984 (6126 words)

	Merriam-Webster Online
		apoapsis is one of more than 1,000,000 entries available at Merriam-WebsterUnabridged.com.
		For More Information on "apoapsis" go to Britannica.com
		Get the Top 10 Search Results for "apoapsis"
	www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=apoapsis (55 words)

	apoapsis - definition, thesaurus and related words from WordNet-Online (Site not responding. Last check: 2007-07-20)
		apoapsis - definition, thesaurus and related words from WordNet-Online
		Hint: double-click any word on the page to get it searched!
		apoapsis, point of apoapsis - (astronomy) the point in an orbit farthest from the body being orbited
	www.wordnet-online.com /apoapsis.shtml (49 words)

	point of apoapsis - Definition of point of apoapsis by Webster's Online Dictionary (Site not responding. Last check: 2007-07-20)
		point of apoapsis - Definition of point of apoapsis by Webster's Online Dictionary
		point of apoapsis - (astronomy) the point in an orbit farthest from the body being orbited
		aphelion, apoapsis, apogee, apojove, apolune, aposelene, astronomy, celestial orbit, celestial point, orbit, periapsis, point of periapsis, uranology
	www.webster-dictionary.org /definition/point%20of%20apoapsis (73 words)

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