Radiant (meteor shower)

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Topic: Radiant (meteor shower)

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	AllRefer.com - meteor shower (Astronomy, General) - Encyclopedia
		The trails of the meteors of a meteor shower all appear to be traceable back to a single point in the sky, known as the radiant point, or radiant.
		A shower is named for the constellation in which its radiant is located, e.g., the Lyrids appear to come from a point in Lyra, the Perseids from Perseus, and the Orionids from Orion.
		meteor shower, increase in the number of meteors observed in a particular part of the sky.
	reference.allrefer.com /encyclopedia/M/meteorsh.html

	IMO Meteor Shower Calendar 2000 International Meteor Organization
		Table 1: Optimum radiant diameters to be assumed for shower association of minor-shower meteors as a function of the radiant distance D of the meteor.
		Following the wholly unexpected strong return of this shower in 1998, we are delighted to reintroduce the June Bootids to the Working List of visual meteor showers this year, and to encourage all observers to routinely monitor the expected activity period in case of future outbursts.
		The angular velocity of the meteor should match the expected speed of the shower meteors according to the geocentric velocity of the meteoroids.
	www.imo.net /calendar/cal00.html

	Meteor Showers in 2005-2006
		Like sporadic meteors, meteors from a shower can be seen in any part of the sky, but if you take the ending point of the meteors' trails and trace them backward through their starting points, the place where these paths converge is the radiant for that shower.
		The radiant of a shower is the point in the sky from which meteors would appear to come if you traced their visible paths backward.
		The number of meteors visible depends upon the shower, but the number of visible meteors can range from 5 per hour to 100 per hour or more.
	www.geocities.com /~starwanderer/meteor.htm

	meteor shower
		The Geminid meteor shower will be appearing in 2005 from the 7 to 17 of December and will peak around the 14th of December 13:30 UT. Their ZHR (Zenith hourly ratio) is 120 and its radiant is R.A. 112 degrees and declination +33 degrees.
		The Leonid meteor shower will be appearing in 2005 from the 14 to 21 of November and will probably peak on November 17, 2005 14:30 UT. Unfortunately, the almost full Moon will be lighting up the sky the entire night.
		The Lyrid meteor shower will be appearing in 2005 from the 16 to the 25 of April and will peak around April 22, 2005.
	www.sky-watch.com /meteor.html

	StarDate Online 2005 Meteor Showers and Viewing Tips
		Meteor showers are named by the constellation from which meteors appear to fall, a spot in the sky astronomers call the radiant.
		An increase in the number of meteors at a particular time of year is called a meteor shower.
		The Perseid meteor shower is so named because meteors appear to fall from a point in the constellation Perseus.
	stardate.org /nightsky/meteors

	Meteor Showers
		Known meteor showers are usually named for the constellation from which the meteors seem to originate, called the radiant, or for the comet responsible for the shower.
		Many meteor showers can be predicted, as they repeat every year when the earth passes through the path of a comet.
		Occasionally, though, intense meteor displays fill the sky with tens, hundreds, or even thousands of of meteor trails.
	liftoff.msfc.nasa.gov /academy/space/solarsystem/meteors/Showers.html

	The Leonids
		The radiant point of the shower is in the "sickle" of Leo at a right ascension of 10h 14m and a declination of +22 degrees.
		Jupiter Scientific's annual report on the Leonid Meteor shower; The viewing of the Leonids for 2002.
		The meteors radiate from Leo, the zodiac constellation associated with the astrological sign of the lion for those born in August.
	www.jupiterscientific.org /sciinfo/leonid.html

	Leonid Meteor Shower Peaks Friday
		Observations of this storm, coupled with those of succeeding years, allowed scientists to theorize that the meteors originated from a cloud in space and later to establish the shower's radiant, or apparent point of origin.
		The meteor showers of those years approached the intensity of "meteor storms," a threshold generally marked when viewers can see a thousand meteors an hour.
		They note, however, that predicting meteor shower intensity is not always an exact science.
	news.nationalgeographic.com /news/2004/11/1112_041112_leonid_meteor_shower.html

	The Quadrantid Meteor Shower
		The source of the Quadrantid meteor shower was unknown until Dec. 2003 when Peter Jenniskens of the NASA Ames Research Center found evidence that Quadrantid meteoroids come from 2003 EH1, an "asteroid" that is probably a piece of a comet that broke apart some 500 years ago.
		The Quadrantid meteor shower is one of the year's best, regularly producing 50 to 120 meteors per hour.
		The shower's radiant is located high in the northern sky, so observers in the southern hemisphere, where the weather might be more favorable, see almost nothing.
	www.spaceweather.com /meteors/quadrantids/quadrantids.html

	The Perseid meteor shower peaks on August 12, 2000
		Perseid meteors can appear anywhere in the sky although their trails will point back toward the radiant, pictured as a red dot in the sky map.
		An average Perseid meteor is about as bright as the stars in the Big Dipper, and they are noted for their colorful, long-lasting trails (called "persistent trains" by serious meteor watchers).
		To catch a glimpse of these reliable meteors, simply wake up early and be outdoors away from bright city lights before dawn on August 12th.
	spacescience.com /headlines/y2000/ast08aug_1.htm

	APOD: August 9, 1996 - The Perseid Meteor Shower
		Herrick of New Haven, Connecticut correctly suspected in 1837 that this meteor shower was an annual event.
		This year, European and North American observers should be able to view the shower near its maximum, about 90 meteors per hour, early Monday morning August 12, but the shower should be enjoyable on clear weekend nights (August 10,11) as well.
		regular August shower caused by the yearly passage of the Earth through the orbiting debri left behind by periodic comet Swift-Tuttle.
	antwrp.gsfc.nasa.gov /apod/ap960809.html

	Meteors and Meteor Showers
		Further, during meteor showers (which usually last a few days), the majority of the meteors appear to come from a particular point in the sky, called the radiant of the shower.
		The adjacent figure illustrates the position of the radiant for the Leonid Meteor Shower, and here is a time-exposed image showing clearly the
		Here is an observational determination of the radiant for the Quadrantid shower, and an MPEG movie (127 kB, compressed in time) showing 18 meteors of the Quandrantid shower.
	csep10.phys.utk.edu /astr161/lect/meteors/showers.html (1166 words)

	AMS Meteor Showers page
		Meteor showers are usually named for the constellation in which their radiant lies at the time of shower maximum.
		Radiant: the area in the sky where shower meteors seem to appear from.
		Meteor activity is best seen in the absence of moonlight so showers reaching maximum activity when the moon is less than 10 days old or more than 25 are much more favorably observed than those situated closer to the full moon.
	www.amsmeteors.org /showers.html (1486 words)

	An Exploration of Meteor Angular Speeds
		In order to illustrate how actual meteors behave with regard to angular speed verses angular distance from the radiant, we employ a meteor shower computer simulation written by the author for the Maple mathematics package.
		The eight meteors are evenly distributed at distances of 5, 10, 15, 20, 25, 30, 35, and 40 degrees from the radiant point, with a "near" and "far" pair placed in each directional quadrant.
		The meteor angular speed estimate is primarily used for meteor shower classification verification, using the relationships shown in Equations 1 & 2 and Figures 1-5.
	www.serve.com /wh6ef/richardson/angspeed.html (1486 words)

	Meteors and Meteor Showers
		Further, during meteor showers (which usually last a few days), the majority of the meteors appear to come from a particular point in the sky, called the radiant of the shower.
		Here is an observational determination of the radiant for the Quadrantid shower, and an MPEG movie (127 kB, compressed in time) showing 18 meteors of the Quandrantid shower.
		The adjacent figure illustrates the position of the radiant for the Leonid Meteor Shower, and here is a time-exposed image showing clearly the
	csep10.phys.utk.edu /astr161/lect/meteors/showers.html (1166 words)

	Search Encyclopedia.com
		The trails of the meteors of a meteor shower all appear to be traceable back to a single point in the sky, known as the radiant point, or radiant.
		meteor shower meteor shower, increase in the number of meteors observed in a particular part of the sky.
		meteor meteor, appearance of a small particle flying through space that interacts with the earth's upper atmosphere.
	www.encyclopedia.com /searchpool.asp?target=MBDA+Meteor (541 words)

	Meteor Showers in 2005-2006
		Like sporadic meteors, meteors from a shower can be seen in any part of the sky, but if you take the ending point of the meteors' trails and trace them backward through their starting points, the place where these paths converge is the radiant for that shower.
		The radiant of a shower is the point in the sky from which meteors would appear to come if you traced their visible paths backward.
		Although meteors can be large, the typical size of the particle that produces such a lovely display in our sky ranges from about the size of a grain of sand to the size of a small pebble.
	www.geocities.com /~starwanderer/meteor.htm (550 words)

	Glossary International Meteor Organization
		The number of shower meteors per hour one observer would see if his limiting magnitude is 6.5mag and the radiant is in his zenith.
		The meteors belonging to one shower appear to emanate from their radiant.
		Visual observations are used to monitor major meteor showers, sporadic activity and minor showers down to a ZHR of 2.
	www.imo.net /glossary.html (1047 words)

	2005 METEOR SHOWERS
		General shower attributes, radiant maps and predicted times of maximum are from the International Meteor Organization's
		At other times, many of the meteors seen may be attributed to a common radiant.
		The South Delta Aquarids are medium-speed meteors, and tend to be faint on average.
	skytour.homestead.com /met2005.html#anchor_9 (696 words)

	Meteor Supersite
		A particularly intense meteor shower is called a meteor storm.
		Meteoroids and Meteorites - meteor stream, the meteor rate is increased and a meteor shower results.
		Meteor Streams - Meteor Streams The table below shows predicted activity periods and dates of maximum activity for 2003, the radiant (apparent origin in the sky), average predicted meteor apparent (atmospheric.
	www.dunningadvertising.com /listings/meteor.htm (696 words)

	NAMN Guide: Appendix A - List of Meteor Showers
		The average meteor from this shower is faint and therefore difficult to photograph.
		Unfortunately this shower is nearly invisible from the Southern Hemisphere due to the northerly declination of its radiant.
		This shower is invisible in the Southern Hemisphere.
	www.namnmeteors.org /appendixA.html (4078 words)

	Your guide to the Perseid meteor shower - Space.com - MSNBC.com
		About five to 10 of the meteors seen in any given hour will not fit this geometric pattern, and may be classified as sporadic or as members of some other (minor) shower.
		The Perseid meteor shower is so named because the flashes appear to radiate from the constellation Perseus, shown on this sky chart.
		For several years before and after its 1992 return, the Perseids were a far more prolific shower, appearing to produce brief outbursts of as many as several hundred meteors per hour, many of which were dazzlingly bright and spectacular.
	www.msnbc.msn.com /id/5623823 (1355 words)

	SPACE.com -- Perseid Preview: Moon to Muscle in on Aug. 12-13 Meteor Shower
		SKY MAP: The radiant for the Perseid meteor shower is a point near the border between Perseus and Cassiopeia, down and to the left from the familiar W pattern of Cassiopeia.
		During this shower, meteors can be seen anywhere in the sky, but they will all appear to be moving away from the radiant.
		Perseid Preview: Moon to Muscle in on Aug. 12-13 Meteor Shower
	www.space.com /spacewatch/persied_preview_030801.html (669 words)

	Meteor Databases READ ME
		If you were to draw a line backward in the sky from all meteors of a given shower, those lines would all intersect at or near that showerÃ¢ÂÂs radiant.
		The radiant positions included in the accompanying databases are given for the time of a showerÃ¢ÂÂs peak activity (in epoch 2000.0 coordinates), and are provided to give the meteor observer some idea as to the radiantÃ¢ÂÂs position.
		2002Ã¢ÂÂs Meteor Shower Calendar was compiled by Alastair McBeath and Rainer Arlt, and it contains a great deal of data about annual meteor showers in general, and about 2001Ã¢ÂÂs showers in particular.
	www.adpartnership.net /StarryNight (669 words)

	The 2003 Perseid Meteor Shower
		Meteors away from the radiant are longer and more eye-catching.
		When the Perseid meteor shower peaks, Mars will be only two weeks away from its closest approach to Earth in some 60,000 years.
		Meteors will seem to flow from a point in Perseus called "the radiant" (red dot).
	science.nasa.gov /headlines/y2003/17jul_perseids2003.htm (669 words)

	A.L.P.O. METEORS SECTION - OBSERVING ALERT PAGE
		To see a meteor shower at its best the radiant must be more than halfway up in the sky.
		These showers are best left to the most experienced observers who use plotting and velocity to determine a meteors classification.
		Please remember that the radiant position will lie west of the listed position before the date of maximum activity and east of the listed position after the date of maximum activity.
	www.lpl.arizona.edu /~rhill/alpo/meteorstuff/metshwr.html (255 words)

	Meteor Showers
		The constellation that a given meteor shower's radiant is in, is the constellation that the shower is named after.
		Because all meteors within a shower are falling toward Earth in parallel paths, to the observer this creates the illusion that they are all originating from one spot in the sky (similar to the way two railroad tracks seem to come together at the horizon).
		Meteor Showers occur due to the Earth passing through or near the path of a comet.
	www.northern-stars.com /meteor_showers.htm (408 words)

	American Meteor Society Intro to Observing
		It is particularly interesting to extend the tracks backward toward the convergent point to find the meteor shower radiant and we would not discourage such experiments even initially.
		Meteor shower rates fluctuate by a considerable amount because meteors even in showers are statistically independent events.
		Because most meteor observers do not start early in the evening (Prior to 10:00 p.m) when the normal rates are low, we still encourage observers, who can, to try to obtain evening hourly rates as the data are needed for statistical purposes.
	www.serve.com /~wh6ef/ams202.html (408 words)

	Perseid FAQ
		shower meteors move faster the closer one gets to 90 degrees distance from the radiant; 2.
		The only shower likely to produce difficulties in plotting terms is the Southern Delta-Aquarids near their peak, though the time of their maximum is rather uncertain, and activity may well be reasonably good for a night or two to either side of the predicted date.
		This means that all meteor workers, wherever they are and whatever methods they use to record meteors, should follow the standard IMO observing guidelines when compiling their information, and submit their data promptly to the appropriate Commission for analysis.
	hcs.harvard.edu /~stahr/info/perseid_faq.html (6874 words)

	Meteor shower - Wikipedia, the free encyclopedia
		Because meteor shower particles are all traveling in parallel paths, and at the same velocity, they will all appear to radiate from a single point in the sky to an observer below.
		For instance, Mars is known to have meteor showers, although these will be different than the ones seen on Earth because the different orbits of Mars and Earth will intersect with orbits of comets in different ways.
		The parent bodies (comets) of most known meteor showers have now been identified.
	www.chicagoheights.us /project/wikipedia/index.php/Meteor_shower (434 words)

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Topic: Radiant (meteor shower)

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