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Topic: Globular Cluster M13

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	Globular Star Clusters - Information and Observations
		Globular clusters are the senior citizens of our galaxy - they contain suns at least 12 billion years old.
		Summer nights are the best time to start hunting for globular clusters, almost one third of them are to be found in the summer constellation of Sagittarius.
		For your first observation of a globular cluster choose M13, the brightest cluster visible from the northern sky, teetering on the edge of naked-eye visibility and appearing as a small, hazy glow in binoculars.
	www.nightskyinfo.com /globular_clusters (661 words)

	Hercules Globular Cluster (M13, NGC 6205)
		The most prominent globular cluster in the northern half of the sky.
		In small telescopes, M13 appears as a misty patch, denser toward the center; in large scopes it's revealed as a nearly perfect sphere of stars.
		M13 was selected in 1974, by Frank Drake and Carl Sagan, as a target for one of the first radio messages addressed to possible extraterrestrial races, sent by the Arecibo Telescope (see Arecibo Message)
	www.daviddarling.info /encyclopedia/H/Hercules_Globular_Cluster.html (234 words)

	Globular Cluster M13
		M13 (NGC 6205) is by and far the largest globular cluster visible to the amateur astronomer.
		M13 is composed of more than a million stars that are packed together at a concentration of 1 star per 100 cubic light years at the outer regions, but may be as high as 3-30 stars per cubic light years at the core.
		With the sun moved to one side of the galactic plane(b), both the expected distribution and the observed distribution of globular clusters were in agreement with one another.
	webhome.idirect.com /~rsnow/finderm13.html (903 words)

	M13 - Globular Cluster in Hercules
		Globular clusters are gravitationally bound concentrations of stars, which form a nearly spherical system around our galaxy.
		The greatest of the globular star clusters, and one of the nearest to the Earth, is the magnificent Omega Centauri, some 17,000 light years distant and visible to the naked eye.
		Inhabitants on a planet inside M13 would probably know nothing of the Galaxy and other galaxies, as their view would be completely blocked by the brilliance of their own skies.
	www.nightskyinfo.com /archive/m13_globular_cluster (353 words)

	Clusters
		Some Open Clusters are clusters by appearance only (they just happen to be optically aligned, the stars were formed at different times).
		Globular clusters may contain hundreds of thousands of stars of the same origin.
		Globular cluster M13 in Hercules is one of the most impressive examples of a globular star cluster.
	www.bisque.com /help/Patterns/patterns/clusters.htm (125 words)

	Astronomy Images by Michael Sparks
		The globular clusters with their tightly packed stars generated a tremendous amount of solar wind that pushed any remaining free gas out of the cluster leaving them with no nebulosity.
		As you can see globular clusters are actually tightly packed stars, relatively speaking that is. So, when you look at one of the images of a globular cluster and see star packed on top of star on top of star remind yourself that what you are looking at is mostly empty space.
		Inhabitants of such a world would know of nothing else except the globular cluster as they would be blinded to the rest of the universe by their own night sky.
	www.geocities.com /astro_imager/globular_clusters.htm (789 words)

	Globular Cluster M13 (Site not responding. Last check: 2007-11-05)
		M13 is one of the better examples of what are known as globular clusters.
		A globular cluster is a cluster of stars, which usually lay on the edges of our galaxy.
		Globular clusters are amazing sites in reflectors with diameters of 10 inches or more, and look quite nice even with small scopes like the FS102.
	home.gwi.net /~aljordan/astro/m13.html (84 words)

	M13, Globular Cluster
		M13 is probably the most looked at and most beautiful object that can be seen in the Northern skies.
		The total luminosity of M13 is over 300,000 times that of the Sun and the total mass is equal to perhaps half a million Suns.
		It is interesting to note that looking back from M13 (a distance of about 21,000 light years), the Sun could not be seen visually in even the largest telescope.
	schmidling.com /m13.htm (600 words)

	Globular Cluster M13 (Site not responding. Last check: 2007-11-05)
		M13 is one of the most prominent and best known globular clusters.
		In fact, globular clusters may be the some of the oldest objects in the universe.
		Globular clusters are found both in spiral galaxies and elliptical galaxies.
	www.wolaver.org /Space/M13.htm (199 words)

	Messier 13 - Wikipedia, the free encyclopedia
		Messier Object 13, the Great Globular Cluster in Hercules; one of the most prominent and best known globular clusters of the Northern celestial hemisphere.
		The Great Globular Cluster in Hercules (also known as the Hercules Globular Cluster, Messier Object 13, Messier 13, M13, or NGC 6205) is a globular cluster in the Hercules constellation at right ascension 16
		The Arecibo message of 1974 was transmitted toward this globular cluster.
	en.wikipedia.org /wiki/Globular_Cluster_M13 (305 words)

	StarGazers Lounge - Blog » M13 GLOBULAR CLUSTER (Site not responding. Last check: 2007-11-05)
		M13, also called the `Great globular cluster in Hercules’, is one of the most prominent and best known globulars of the Northern celestial hemisphere.
		The membership of this star was confirmed by radial velocity measurement, and is strange for such an old cluster - apparently it is a captured field star.
		Nearby, about 40 arc minutes north-east of M13, is the faint (mag 11) galaxy NGC 6207, visible in many large- and medium-size-field photographs of M13, e.g., in the DSSM image.
	www.stargazerslounge.co.uk /blog/2006/04/19/m13-globular-cluster (335 words)

	M13: Hercules Globular Cluster (Site not responding. Last check: 2007-11-05)
		M13 is one of the most prominent and best known globular clusters of the Northern sky.
		Located in the Hercules constellation, M13 is visible to the naked eye on clear nights in dark sky locations.
		M13 is estimated to be about 14 billion years old, which places the date of its origin near to the date of the galaxy's birth.
	www.csupomona.edu /~khoshide/cis311/tutorial05/m13.htm (92 words)

	Messier Object 13
		It was discovered by Edmond Halley in 1714, who noted that `it shows itself to the naked eye when the sky is serene and the Moon absent.' According to Charles Messier, who cataloged it on June 1, 1764, it is also reported in John Bevis' "English" Celestial Atlas.
		The age of M13 has been determined by Sandage as 24 billion years and by Arp as 17 billion years around 1960; Arp later (in 1962) revised his value to 14 billion years (taken from Kenneth Glyn Jones).
		Globular cluster M13 was selected in 1974 as target for one of the first radio messages addressed to possible extra-terrestrial intelligent races, and sent by the big radio telescope of the Arecibo Observatory.
	www.seds.org /messier/m/m013.html (335 words)

	Hercules Globular Cluster M13
		M13, the Hercules cluster, is the most impressive globular cluster readily visible throughout the U.S. It is believed to contain hundreds of thousands (perhaps millions) of stars bound together by their own gravitational pull.
		This photograph captures the cluster better than an eyepiece view at home, but the view through the 10" telescope under a dark sky is simply breathtaking.
		The stars in globular clusters are low in metallicity, indicating that they are relatively old.
	www.djgares.com /id41.html (176 words)

	Globulars
		An interesting fact about globular clusters is that, regardless of the number of stars they contain, the average distance between individual stars is between 3/4 and 1-1/2 light years.
		And because most of the stars in a globular are of the same magnitude, they would appear as grains of sugar sprinkled onto a fl piece of cloth or paper.
		Most of the showplace globulars that amateur astronomers observe occupy positions in the sky that allows them to be seen between late Spring and late Fall.
	www.rocklandastronomy.com /articles/globulars.html (642 words)

	Globulars
		Globular cluster M13 is the brightest globular cluster visible from northern temperate latitudes.
		The pinkish object to the upper left of the cluster's core is a gas cloud surrounding a dying star.
		Globular Cluster M3 is about 100,000 light years away in the constellation Canes Venatici.
	faculty.rmwc.edu /tmichalik/globulars.htm (1085 words)

	M13 (Site not responding. Last check: 2007-11-05)
		Globular clusters are vast swarms of ancient stars that inhabit the halo of our galaxy, outside of the main disk where most of the stars (and the Earth) reside.
		Although the cluster appears extremely dense, the distance between individual stars is actually quite large.
		As a result, stars within them rarely collide, and in the main globular clusters survive relatively unscathed by their passage through the galaxy's disk.
	www.rc-astro.com /star_clusters/globular/m13.htm (149 words)

	Globular Clusters, by Jim Scala
		Globular clusters, like leaves of a maple tree, are all the same, and yet each one is different.
		Put M13 in the center of the field at a star party and don’t tell the first time viewer what is in the field, then wait as they look into the eyepiece.
		In contrast, the galactic cluster represented by M29 is a grouping of stars—a “knot” of stars in the stellar backdrop.
	www.eastbayastro.org /2000/0900/r0900-8.htm (941 words)

	Globular cluster - Wikipedia, the free encyclopedia
		Some globular clusters, like Omega Centauri in our Milky Way and G1 in M31, are extraordinarily massive, weighing as many as several million solar masses, and contain multiple stellar populations.
		The globular star cluster 47 Tucanae, which is made up of about 1 million stars, is one of the densest globular clusters in the Southern Hemisphere.
		The globular cluster Palomar 5, for example, is near the perigalactic point of its orbit after passing through the Milky Way.
	en.wikipedia.org /wiki/Globular_cluster (5026 words)

	APOD: 2004 May 11 - M13: The Great Globular Cluster in Hercules (Site not responding. Last check: 2007-11-05)
		Explanation: M13 is one of the most prominent and best known globular clusters.
		Hercules, M13 is frequently one of the first objects found by curious sky gazers seeking
		M13 is a colossal home to over 100,000 stars, spans over 150
	antwrp.gsfc.nasa.gov /apod/ap040511.html (132 words)

	M13 The Great Globular Cluster in Hercules
		The cluster is estimated to contains as many as a million stars.
		This globular is composed of some of the oldest stars in the Universe.
		The cluster is located about 25,000 light years from the earth in the direction of the constellation Hercules.
	www.waid-observatory.com /m013-2004-03-08.html (147 words)

	Messier Object 92
		Globular cluster M92 is one of the original discoveries of Johann Elert Bode, who found it on December 27, 1777.
		Only about 16 variables have been discovered in this globular, 14 of which are of RR Lyrae type, while one of them is one of the very few eclipsing binaries in globular clusters, of W Ursae Majoris type.
		Although Burnham claims it is not well understood why eclipsing binaries are so rare in globulars, it appears to the present author that there may be a simple answer: In these dense stellar agglomerates, close encounters occur frequently, so that binary systems will be disturbed, and on the long term, will be destroyed.
	www.seds.org /messier/m/m092.html (440 words)

	M13 Globular Cluster (Site not responding. Last check: 2007-11-05)
		M13 is the 13th object in the catalogue compiled by the famous comet hunter Charles Messier.
		It is located in the constellation Hercules, which is high in the summer sky for observers in the northern hemisphere.
		Globular clusters are the oldest stellar systems we know of in the Universe with ages near 15 billion years.
	uregina.ca /~bergbusp/M13.html (156 words)

	M 13 by Shari Shevetz (Site not responding. Last check: 2007-11-05)
		This is the globular cluster M13, taken by my friend Shari.
		She took this with an 11 inch refractor at the Amateur Astronomers Association of Pittsbugh, where she is a member.
		As she has told me, this is a collection of stars about 25,000 light years away -- the light that made that impression left about the time of the ice age.
	hometown.aol.com /gca7sky/glry_a1.htm (70 words)

	M13 Globular Star Cluster (Site not responding. Last check: 2007-11-05)
		The globular star cluster M13 in Hercules is about 25,000 to 30,000 light years from Earth.
		Images of the cluster give the impression that stars in the center of the cluster are crowded together virtually in contact.
		According to Burnham's Celestial Handbook, in a scale model of the star cluster where the stars are the size of a grain of sand, even in the closely packed center of the cluster the grains of sand would be separated from each other by the greater part of a mile.
	members.cox.net /~sidleach/m13_ccd.htm (453 words)

	Globular Cluster M13 (Site not responding. Last check: 2007-11-05)
		This globular cluster is easily seen with binoculars between the two western stars of the "keystone" rhomboid of the constellation Hercules.
		It is the brightest and best globular cluster seen from the Northern Hemisphere.
		M13 contains between 200,000 and 300,000 stars, and lies 23,400 light-years from Earth.
	www.wemac.com /ccd_images/M13.html (47 words)

	Globular Clusters (Site not responding. Last check: 2007-11-05)
		The globular star cluster M4 in Scorpius is one of the largest and nearest objects of its type.
		A view of the globular cluster M13 in Hercules, the finest cluster of its type in the northern half of the sky and one of the most spectacular telescopic objects in the heavens.
		The globular star cluster M92 in Hercules is a rich, beautiful, globular cluster that would normally be considered a major show object.
	faculty.frostburg.edu /phys/latta/astronomy/globular.html (230 words)

	M13 (Site not responding. Last check: 2007-11-05)
		M13 is such a cool object that it is hard to take a bad picture of it.
		The stars in the center of the cluster are concentrated 500 times more densely than stars in our neck of the galaxy.
		Since Globulars are devoid of the dust and gas needed to create new stars, no new stars have been created in the cluster since their separation from the rest of the galaxy.
	www.kkessler.com /objects/M13.html (207 words)

	M13 - The Great Hercules Globular Cluster (Site not responding. Last check: 2007-11-05)
		M13 (NGC 6205) is a globular cluster of several hundred thousand stars located within our galaxy at a distance of approximately 22,200 light years.
		This cluster is located in the constellation Hercules.
		The image above is a color composite of 18, 15-second white images combined with cyan (28x15s), magenta (16x15s) and yellow (14x15sec) images taken on 11 June 2000 and processed using Kunihiko Okano's Digital Development Process.
	members.aol.com /ccdastronomy/m13.html (91 words)

	Globular cluster M13 (Site not responding. Last check: 2007-11-05)
		The famous globular cluster Messier 13 (NGC 6205) in Hercules, seen in a blue-light image taken with the Lowell Observatory 1.1-meter telescope.
		The nonlinear intensity mapping simultaneously shows stars with a wide brightness range, from the brightest red giants down to the main sequence.
		This spans a 17-arcminute field, giving a better impression of the large extent of the cluster.
	www.astr.ua.edu /gifimages/m13b.html (75 words)

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