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Topic: Open Cluster M6

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	Messier Object 6
		Open cluster Messier 6 is described by Burnham as a "charming group whose arrangement suggests the outline of a butterfly with open wings."
		Thus, Philippe Loys de Chéseaux independently rediscovered it in 1745-46, and was the first to recognize it as "a very fine star cluster." Abbe Lacaille included it in his catalog of 1751-52 as Lac III.12, and Charles Messier eventually cataloged it on May 23, 1764.
		Of all Messier objects, M6 is situated at the closest angular distance from the Galactic Center, which is located in the constellation Sagittarius but very near to the 3-constellation edge of Sagittarius, Scorpius and Ophiuchus.
	www.seds.org /messier/m/m006.html (515 words)

	[No title]
		Acta Astron.Mica 16,93 118 Dachs.J. :1970, Photoelectric UBV photometry of the open cluster NGC 2516.
		159 Feinstein, A., Cabrera, A.L., Claria, J.J. 1978: Multicolor photometry of the open cluster NGC 2287.
		275 Joshi,U.C.,Sagar,R.,Pandey,P. :1975, Photoelectric photometry of the open cluster NGC 1778.
	cdsweb.u-strasbg.fr /viz-bin/ftp-index?/ftp/cats/vii/92A/refs (7557 words)

	Open Star Clusters - Information and Observations
		Open clusters are extended families of a few hundred comparatively young stars bound together by gravity.
		Many open clusters such as the Pleiades and the Hyades are large enough to be seen with the naked eye, and hundreds more become visible when using a telescope.
		M6 is a fairly difficult object due to its southern declination, but it can be easily seen if you have a clear southern horizon.
	www.nightskyinfo.com /open_clusters (604 words)

	BinoSky: A guide to astronomy with binoculars.
		47 Tucanae (NGC 104, a globular cluster in Tucana)
		M6 (the Butterfly Cluster, an open cluster in Scorpius)
		NGC104 (47 Tucanae, a globular cluster in Tucana)
	www.lightandmatter.com /binosky/binosky.html (804 words)

	Open Clusters
		In older publications they are usually called ‘galactic clusters,’ because we see them inside the body of our galaxy, but now it is more common to refer to them as ‘open clusters’ because their member stars are much less concentrated than those of globular clusters.
		Open clusters (relative to globular clusters) are young clusters of metal rich Population I stars.
		Although clusters are often moved out of the galactic plane by their passage through interstellar clouds or close approaches to other massive bodies, it takes a very long time for the orbital plane to become as inclined as that of NGC 752.
	www.peripatus.gen.nz /Astronomy/OpeClu.html (2247 words)

	Open Star Clusters - Information and Observations (Part 3)
		M39 is a cluster in Cygnus, composed of bright stars scattered around the field.
		The stars of the cluster are grouped in the form of an isosceles triangle.
		The cluster consists of a great number of stars, but because of its large diameter it is best seen in a finder scope.
	www.nightskyinfo.com /open_clusters/index_3.htm (636 words)

	M 6
		The diameter of this star cluster is some 20 light years, with an estimated average density of 0.6 star per cubic parsec.
		The brightest star in this cluster is a yellow or orange giant (spectral type K0-K3) of apparent magnitude 6.17 (the most left of the 4 bright stars forming the remarkable quadrangle of approximate parallelogram shape in our photo), while the hottest stars are blue main sequence stars of spectral type B4-B5.
		Of all Messier objects, M6 is situated at the closest angular distance from the Galactic Center, which is located in the constellation Sagittarius but very near to the 3-constellation edge of Sagittarius, Scorpius and Ophiuchus.
	www.messiermarathon.com /new_page_12.htm (248 words)

	IceInSpace - Australian Amateur Astronomy, News and Forums \| Observing Challenge \| Challenge Objects - July 2005
		M6, also known as NGC6405 or the “Butterfly cluster”, and is visible to the naked eye in the constellation Scorpius.
		It is described by Burnham as a "charming group whose arrangement suggests the outline of a butterfly with open wings".
		The cluster is made up of approximately 80 stars spread over a region about 54 arcmin in diameter, and the visually most conspicuous star is a rather reddish slow, semiregular variable BM Scorpii (HD 160371), a yellow or orange supergiant (spectral type K0-K3 Ib).
	www.iceinspace.com.au /index.php?id=69,217,0,0,1,0 (1314 words)

	M6 (Site not responding. Last check: 2007-10-15)
		M6 Bayonet, a bayonet used by the U.S. military for the M14 rifle
		M6 Toll a toll road to relieve congestion on the M6 motorway.
		M6 motorway; a short section of the N6 national primary road near Kinnegad on the road from Dublin to Galway in the Republic of Ireland.
	www.kiwipedia.com /m6.html (122 words)

	M6
		Messier object M6 is a open cluster which is located in the constellation Scorpius.
		This Open Cluster has an apparent angular size of 15 and a visual brightness of 5.3.
		It is commonly known as the Butterfly Cluster.
	www.absoluteastronomy.com /messier_objects/m6.htm (75 words)

	DeepSkyImager Gallery :: M6 Open Cluster
		M6 is an open cluster of stars found in the constellation of Scorpius.
		This cluster is composed mainly of blue and white stars with the brightest being a yellow or orange giant.
		The shape of this cluster somewhat resembles that of a butterfly, giving rise to its more common name, the butterfly cluster.
	www.skyinsight.net /DeepSkyImager/gallery/M6 (80 words)

	OPEN STAR CLUSTERS
		Open clusters are often considered quite stable gravitational systems but in truth are prone to suffer losses of stellar members.
		As the cluster ages, the larger stars are first start run out of fuel, and begin their individual evolution upon such energy crises and soon the star rapidly swells to becoming a red giant.
		Not to be confused with the Coma Berenices galaxy cluster!
	www.geocities.com /ariane1au/Page030.htm (6645 words)

	Messier Object 7
		This splendid cluster was known to Ptolemy, who mentioned it about 130 AD and described it as the "nebula following the sting of Scorpius." The description may also include M6, but this is uncertain.
		Ake Wallenquist found that this is one of the clusters with the highest degree of concentration toward the center.
		Modern sources agree on M7's integrated apparent visual brightness at magnitude 3.3, while older estimates, mostly from northern observers, had this southern cluster significantly underestimated at mag 4.1 to 5.0.
	messier.obspm.fr /m/m007.html (331 words)

	Cosmic Voyage-The Online Resource for Amateur Astronomers (Site not responding. Last check: 2007-10-15)
		M6 is an impressive open star cluster in eastern Scorpius.
		M6 is located about 5 degrees north-northeast of the stinger in the tail of the scorpion.
		The most interesting feature of M6 for me is two rows of 10th magnitude stars fanning out between a pair of 8th magnitude stars.
	hometown.aol.com /billferris/m6.html (138 words)

	M6 (Site not responding. Last check: 2007-10-15)
		M6 is an open star cluster located near the tail of Scorpius about 3-1/2 degrees northwest of M7.
		Although M6 is visible to the naked eye, P.L. de Cheseaux is credited with discovery of M6 in 1746, and he was the first to identify it as a star cluster.
		M6 is known as the Butterfly Cluster, because the arrangement of this group of stars suggests the outline of a butterfly with open wings.
	members.cox.net /~k5xi/m6.htm (108 words)

	Butterfly Cluster - Wikipedia, the free encyclopedia
		The Butterfly Cluster (also known as M6 or NGC 6405) is an open cluster in the constellation of Scorpius.
		It is visually the closest Messier object (in angular distance) to the center of the galaxy in Sagittarius.
		Estimates of the cluster's distance have varied over the years with a mean value of around 1,600 light years, giving it a spatial dimension of some 12 light years.
	en.wikipedia.org /wiki/Butterfly_Cluster (255 words)

	APOD: January 6, 1999 - M6: The Butterfly Cluster (Site not responding. Last check: 2007-10-15)
		M6, also known as NGC 6405, spans about 20 light-years and lies about 2,000 light years distant.
		open clusters, M6 is composed predominantly of young blue stars, although the brightest star is nearly orange.
		M6 is estimated to be about 100 million years old.
	antwrp.gsfc.nasa.gov /apod/ap990106.html (120 words)

	Sagittarius (Site not responding. Last check: 2007-10-15)
		Sagittarius, "The Archer," is one of the richest constellations in the sky, filled with numerous nebulae and clusters.
		Below and to the left of M24 is the open cluster M25.
		In the right portion of the image are the large open cluster M7 and the smaller open cluster M6 in Scorpius.
	webpages.charter.net /alsonwongweb/sagittar.htm (257 words)

	M6 (Site not responding. Last check: 2007-10-15)
		Open Cluster M6, an open cluster of stars in the Scorpius constellation
		The M6 cipher, a Block cipher used by DTCP.
		It is licensed under the GNU free documentation license.
	www.ufaqs.com /wiki/en/m6/M6.htm (130 words)

	NCKAS -Open Clusters
		Open clusters NGC 869 and NGC 884, however, are doubly impressive.
		The clusters are over 7,000 light years distant toward the constellation of Perseus, but are separated by only hundreds of light years.
		These clusters are magnificent viewed with wide-field as a pair, or viewed separately under higher magnification and smaller field of view.
	www.nckas.org /openclusters (1812 words)

	Messier M6: The Butterfly Cluster
		M6 is visible to the naked eye, and about 330 stars have been identified in the cluster.
		Charles Messier catalogued it in 1764 who described it as "a cluster of small stars between the bow of Sagittarius and the tail of Scorpius".
		To the naked eye it resembles a nebula without stars, but even a small telescope reveals it as a cluster of small stars".
	www.r-clarke.org.uk /messier/m6.htm (130 words)

	Scorpius (Site not responding. Last check: 2007-10-15)
		Numerous star clusters and emission nebulae can be seen near the stars which form the "stinger" in the lower left portion of the image.
		To the left of the end of the stinger (Lambda Scorpii) are the large open cluster M7 and the smaller open cluster M6.
		The bottom center portion of the image contains the large open cluster H12 and the emission nebula IC 4628.
	webpages.charter.net /alsonwongweb/scorpius.htm (223 words)

	Some Facts About Aftershocks to Large Earthquakes in California (Site not responding. Last check: 2007-10-15)
		In any cluster of earthquakes, the one with the largest magnitude is called the mainshock; earthquakes that occur before the mainshock are called foreshocks while those that occur after the mainshock are called aftershocks.
		That is, a sequence of aftershocks follows certain global patterns as a group, but the individual earthquakes comprising the group are random and unpredictable.
		Clustering of earthquakes usually occurs near the location of the mainshock.
	geopubs.wr.usgs.gov /open-file/of96-266 (978 words)

	The Astronomy Connection - August Messier Tour
		There are six globular clusters, four open clusters, and two diffuse nebula.
		These clusters are not resolvable through small scopes, and appear as round fuzzy patches brightening towards the center.
		This is a pair of large, bright open clusters in Scorpius visible to the naked eye.
	observers.org /observing/m-aug.html (560 words)

	M 6 (NGC 6405) (Site not responding. Last check: 2007-10-15)
		The open star cluster M6, or NGC6405, is also known as the Butterfly Cluster.
		M6 is visible to the naked eye in the constellation Scorpius.
		M6 is variously estimated as between 50 and 100 million years old.
	www.racine.ra.it /planet/testi/Foto/m6.htm (105 words)

	Stargazer Online \|\| Open Clusters M6 & M7 (Site not responding. Last check: 2007-10-15)
		Open Clusters M6 and M7 Open Clusters M6 and M7 Thursday, May 17, 2001
		M6 and M7 are excellent objects to observe in an ordinary pair of binoculars and easy to see with the naked eye (especially from TSP).
		M7 is the larger open cluster in the middle and M6 is above and to the right.
	www.richardbell.net /Astrophotos/M6M7.html (117 words)

	Gary's Amateur Astronomy
		Open cluster of about 50 stars, detached, large range of brightness.
		Open cluster of about 100 stars, detached, weak concentration of stars, medium range of brightness.
		Open cluster of about 80 stars, detached, strong concentration of stars.
	home.comcast.net /~astrohammer/Observingmessier.htm (916 words)

	Scorpius
		The "Butterfly Cluster" - a bright open cluster of 132 stars, 6th magnitude and fainter, 26 arc minutes in diameter, glowing at magnitude 4.6.
		A bright open cluster, 3.5° southeast of M6.
		A faint open cluster near M6 of about 12 faint stars, surrounding a 6th magnitude double star.
	calgary.rasc.ca /constellations/scorpius.htm (270 words)

	Objects - Open Clusters
		Most of the clusters we see are in our galactic neighborhood, in the spiral arms.
		There are many open clusters available to show, including 27 of the Messier objects.
		The fainter open clusters are an acquired taste; for the beginning stargazer, there's not much difference between an open cluster and any other bunch of stars in a field of view.
	depts.clackamas.cc.or.us /haggart/WhatsUp/OpenClusters.htm (258 words)

	M 7
		This splendid cluster was known to Ptolemy who mentioned it about 130 AD, who described it as the "nebula following the sting of Scorpius".
		The description may also include M6 but this is uncertain.
		Charles Messier observed May 23rd 1764 "A larger cluster of stars than the previous one." (M6).
	www.messiermarathon.com /new_page_13.htm (138 words)

	RedOrbit - Reference Library (Site not responding. Last check: 2007-10-15)
		Butterfly Cluster -- To some, the outline of the open cluster of stars M6 resembles a butterfly.
		M6 can best be seen in a dark sky with binoculars towards the constellation of Scorpius, coving about as much of the sky as the full moon.
		Like other open clusters, M6 is composed predominantly of young blue stars, although the brightest star is nearly orange.
	www.redorbit.com /education/reference_library/?article_id=27 (186 words)

	Waid Observatory - Messier Catalog
		M6 The Butterfly Cluster open cluster in Scorpius
		M11 The Wild Duck Cluster open cluster in Scutum
		M16 open cluster associated with the Eagle Nebula in Serpens Cauda
	www.waid-observatory.com /gallery-messier.html (229 words)

	M6 - TvWiki, the free encyclopedia
		Open Cluster M6, an open cluster of stars in the Scorpius constellation
		The M6 standard for calibrating stereo Peak programme meters
		The M6 cipher, a block cipher used by DTCP.
	www.tvwiki.tv /wiki/M6 (130 words)

	Messier Index
		M16 open cluster associated with the Eagle Nebula or Star Queen Nebula IC 4703 in Serpens Cauda
		M17 The Omega or Swan or Horseshoe or Lobster Nebula diffuse nebula in Sagittarius
		M44 Praesepe, the Beehive Cluster open cluster in Cancer
	www.seds.org /messier/data2.html (296 words)

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