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	open cluster
		Open clusters are only weakly held together by gravity and are fated to disperse over a period of several hundred million years.
		The stars in open clusters have formed together within the same interstellar cloud; indeed, in many diffuse nebulae, the birth of new open clusters can be seen taking place.
		As open clusters drift along, some of their members escape due to velocity changes in mutual closer encounters, tidal forces in the galactic gravitational field, and encounters with field stars and interstellar clouds passing their way.
	www.daviddarling.info /encyclopedia/O/opencluster.html (218 words)

	Messier Object 39
		M39 is a very large but very loose open cluster, situated some 9 degrees east and a bit north of Deneb (Alpha Cygni).
		M39 is approaching us at 28 km/s; its proper motion was given as 0.024" per year in the direction of position angle 222 deg (by E.G. Ebbighausen 1940, according to Burnham).
		M39 is 3 deg N and 1/4 deg W. It is also 2 1/2 deg W and 1 deg S of 4.5-mag Pi2 Cygni.
	www.seds.org /messier/m/m039.html (434 words)

	DeepSkyImager Gallery :: M39 Open Cluster
		M39 is a very loose cluster of about 30 stars.
		The cluster has a diameter of about 7 light years, and is believed to be over 250 million years old.
		With a visual magnitude of 5.2, it is a bright cluster although very loosely populated.
	www.skyinsight.net /DeepSkyImager/gallery/M39 (65 words)

	M39
		Messier object M39 is a open cluster which is located in the constellation Cygnus.
		This Open Cluster has an apparent angular size of 32 and a visual brightness of 4.6.
		M39 is unnamed and has an NGC catalog number of NGC 7092.
	www.absoluteastronomy.com /messier_objects/m39.htm (70 words)

	Open Star Clusters
		Over 1100 open clusters are known in our Milky Way Galaxy, and this is probably only a small percentage of the total population which is probably some factor higher; estimates of as many as about 100,000 Milky Way open clusters have been given.
		The first open clusters have been known since prehistoric times: The Pleiades (M45), the Hyades and the Beehive or Praesepe (M44) are the most prominent examples, but Ptolemy had also mentioned M7 and the Coma Star Cluster (Mel 111) as early as 138 AD.
		All the diffuse nebulae in Messier's catalog are associated with open clusters of young stars which have formed of the nebula's material in (astronomically) very recent times, and are still formed today in many cases.
	www.seds.org /messier/open.html (1113 words)

	Open Star Clusters - Information and Observations (Part 4)
		NGC 6530 is the cluster formed inside the Lagoon Nebula and it is surrounded by faint traces of nebulosity.
		IC 4703 is the cluster surrounded by the Eagle Nebula.
		The clusters are composed of countless stars and both are extremely dense.
	www.nightskyinfo.com /open_clusters/index_4.htm (655 words)

	APOD: 2004 March 31 - M39: Open Cluster in Cygnus (Site not responding. Last check: 2007-10-08)
		M39 is a mosaic of 33 images taken by the WIYN telescope on Kitt Peak in Arizona,
		M39 are all about 300 million years old, much younger than the 5000 million years of our Sun.
		open clusters are generally confined to the plane of our Galaxy.
	antwrp.gsfc.nasa.gov /apod/ap040331.html (130 words)

	Astronomical Observations
		OPEN CLUSTERS FOUND TO DATE: M29, M35, M36, M37, M38, M39, M41, M44, M45, M50, M52, M67, M93, M103, NGC 225, NGC 457, NGC 654, NGC 659, NGC 663, NGC 1981, Double Cluster, Hyades.
		This is a large open cluster located in the constellation of Cancer.
		This is a large open cluster in cassiopea.
	www.angelfire.com /space/observations/open.html (614 words)

	Deep Space
		M34, an open cluster, taken through the SLR lens on 9/20/05.
		The cluster is against the backdrop of the Milky Way, so with longer exposures you get a lot more stars.
		The globular cluster (almost a mini-galaxy) in the constellation Hercules: M13.
	www.russsscope.net /deepspace.htm (449 words)

	APOD Search Results for "open cluster"
		Open clusters of stars are younger, contain few stars, and contain a much higher fraction of blue stars than do globular clusters of stars.
		NGC 290 and other open clusters are good laboratories for studying how stars of different masses evolve, since all the open cluster's stars were born at about the same time.
		The center of the open cluster, visible on the upper right, formed only about two million years ago and is dominated in brightness by a host of bright young blue stars.
	antwrp.gsfc.nasa.gov /cgi-bin/apod/apod_search?open+cluster (9676 words)

	M39 Open Cluster in Cygnus
		The above picture of M39 is a mosaic of 33 images taken by the WIYN telescope on Kitt Peak in Arizona, USA.
		Open clusters, also called galactic clusters, contain fewer and younger stars than globular clusters.
		Also unlike globular clusters, open clusters are generally confined to the plane of our Galaxy.
	www.skyimagelab.com /m39-cygnus.html (221 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		In the vicinity of Cygnus the Swan are two open star clusters that are within the reach of binoculars and low-magnification, wide-field eyepieces in a telescope.
		About 9 degrees from Deneb, the 'tail' of the swan, is the the open star cluster M39.
		Approximately 7 degrees from Deneb in the opposite direction is another open star cluster, M29.
	currentsky.com /2005/aug05/whatsup3.html (218 words)

	Clusters
		The image doesn't do the cluster justice since the field of view is so restricted on the TC255 chip.
		This is another big cluster that is almost better in the view finder than in the scope itself, use your widest angle and lowest magnification eyepiece.
		This was a much smaller cluster that had some nebulostiy in the center where I couldn't resolve stars all the way.
	www.dharmaworks.net /Astronomy/clusters.html (864 words)

	AGO Astronomski observatorij
		True color image of M45 open cluster, taken on September 8th, 2002 with the 19-cm, f/4 flat field S-C telescope and Wright CCD camera.
		True color image of M39 open cluster, taken on September 8th, 2002 with the 19-cm, f/4 flat field S-C telescope and Wright CCD camera.
		True color image of M34 open cluster, taken on September 8th, 2002 with the 19-cm, f/4 flat field S-C telescope and Wright CCD camera.
	astro.ago.uni-lj.si /astro/gallery/gal1.html (712 words)

	synner astro - ic5146
		The Cocoon Nebula, Sh2-125, is involved with open star cluster IC 5146, and lies at the end of an interesting dark nebulae, B168 in Cygnus.
		The cluster is not very rich, containing only about 20 stars, the brightest of which is about magnitude 9.6.at the center of the cluster and nebula.
		The dark nebula B168, however, is easily visible in binoculars and is a fascinating object amidst the rich Cygnus star fields, about 3 degrees east-southeast of open cluster M39.
	www.synner.ath.cx /astro_backup/IC5146.html (193 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)

	Messier Objects 1-50 (Site not responding. Last check: 2007-10-08)
		At a magnitude of 6, this bright cluster is rich with variable stars known as RR Lyrae stars.
		This cluster is a twin to M10 in size and distance.
		M13 This is a globular cluster in Hercules.
	www.ess.sunysb.edu /observer/mess1.html (447 words)

	Gary's Amateur Astronomy
		This beautiful cluster can be found in Cassiopeia, and is a favorite deep space object of many observers.
		It may not have as many stars as other open clusters, but it seems to sparkle like a jewel box when observed through a telescope.
		Brocchi's Cluster, aka Collinder 399, aka The Coathanger is an open cluster of stars found in Vulpecula.
	home.comcast.net /~astrohammer/Photogalleryastrophoto.htm (1466 words)

	Astronomy Picture of the Day 03-31-04
		Explanation: Lying just at the limit of human perception is a picturesque starfield containing one of the larger open clusters on the northern sky.
		The 14 globular clusters the team has found orbiting far out from M31 may be evidence of Andromeda's past cannibalism.
		Globular clusters are ancient systems of hundreds of thousands of stars, which are seen around many galaxies, and provide many clues to their evolutionary history.
	www.freerepublic.com /focus/f-chat/1108541/posts (888 words)

	Messier 39
		Open Cluster M39 (also known as Messier Object 39, Messier 39, M39, or NGC 7092) is an open cluster in the Cygnus constellation.
		M39 is at a distance of about 800 light years away from Earth.
		It is located at Right Ascension 21hours, 32.2 minutes, and Declination +48 degrees 26'.
	www.danceage.com /biography/sdmc_Open_Cluster_M39 (58 words)

	More M39
		This picture of open cluster M39 is a combination of 33 dithered frames in BVR colors taken with the Mosaic camera at the WIYN 0.9-meter telescope on Kitt Peak, near Tucson, Arizona, on the night of September 15th, 2003.
		This camera uses eight separate CCD detectors to cover a large area of the sky, but requires small dither motions between multiple exposures to fill in the gaps between the individual chips.
		IR image of open cluster M39 in Cygnus, taken with the 2MASS IR telescopes.
	www.obspm.fr /messier/more/m039_more.html (114 words)

	What’s Up - 365 Days of Skywatching » Tuesday, October 17, 2006
		Tonight the large, bright and scattered open cluster M39 is in favor just after skydark.
		A degree and a half south of M39 is its “echo” - the large, faint, 7.2 magnitude open cluster NGC 7082.
		Returning to M39, head two finger-widths southwest in the direction of Deneb to seek 6.8 magnitude IC 1369.
	www.astrowhatsup.com /2006/10/17/tuesday-october-17-2006 (210 words)

	Al Kelly's CCD Astrophotography Page (Site not responding. Last check: 2007-10-08)
		L/RGB image of open cluster NGC 7789 in Cassiopeia, made from images taken by Al Kelly with a Starlight Express MX916 and a Celestron CGE 1400 at f5.3 on 11/23/06 from Friendswood, Texas, using Schuler RGcBc filters.
		L/RGB image of open cluster NGC 6811 in Cygnus, made from images taken by Al Kelly with a Starlight Express MX916 and a 17.5" f4.5 Newtonian on 8/13/06 from Friendswood, Texas, using Schuler RGcBc filters.
		L/RGB image of open cluster NGC 2194 in Orion, made from images taken by Al Kelly with a Starlight Express MX916 and a 17.5" f4.5 Newtonian on 1/2/06 from Friendswood, Texas, using Schuler RGcBc filters.
	www.ghg.net /akelly (4310 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)

	Williams College Student CCD Image Gallery (Site not responding. Last check: 2007-10-08)
		M13 (globular cluster in Hercules), Emanuel Gregg, Astronomy 101
		M39 (open cluster in Cygnus), Leroy Lindsay, Astronomy 101
		NGC457 (open cluster in Cassiopeia), Leroy Lindsay, Astronomy 101
	www.williams.edu /astronomy/hopkins/CCD_F05.html (182 words)

	Stargazers' Newsletter (Site not responding. Last check: 2007-10-08)
		What really makes this pair so wonderful is the colors that they reveal when looked at with a pair of binoculars or a small telescope.
		Because Cygnus is nestled in the Milky Way there are many star clusters, nebulae, and galaxies to behold.
		Aquila the Eagle has several faint open clusters and planetary nebulae but are difficult to find without moderate equipment.
	www.rcsweb.org /tsg/archive/Sept/body.html (1939 words)

	[No title]
		Over the next two nights I tried the eyepiece out on several targets including the open cluster M39, the Ring Nebula M57, the doubles Epsilon Lyra and Eta Cassiopeia, the star Vega and on the Moon (not literally).
		When viewing a relatively dim open cluster, there was no noticeable chromatic aberration.
		When viewing M39 (an open cluster) these aberrations were far less apparent and were acceptable right out to 95% of the field of view.
	www.weasner.com /etx/reviews/2005/morris-zhitong11mm.doc (1005 words)

	M39 in BinoSky, a guide to astronomy with binoculars. (Site not responding. Last check: 2007-10-08)
		M39 in BinoSky, a guide to astronomy with binoculars.
		Magnitudes are given without a decimal point, e.g.
		Visible from a reasonably dark area, but nothing worth writing home about.
	www.lightandmatter.com /binosky/m39.html (37 words)

	What’s Up - 365 Days of Skywatching » 2006 » October
		Starting with M39 head less than two finger-widths east-southeast to a 7.2 magnitude open cluster.
		This one is associated with the 12th magnitude “Cocoon Nebula.” Collectively known as IC 5146, this cluster with nebulosity consists largely of 12th magnitude stars, and is around mid-sized.
		The closest deepsky study to Cas A is the dense and compact open cluster NGC 7510.
	www.astrowhatsup.com /2006/10/page/2 (2003 words)

	More M39 (Site not responding. Last check: 2007-10-08)
		Tim Hunter and Dan Kraus took this beautiful color film image of open cluster M39 in Cygnus from Grassland Observatory near Tucson, Arizona, during their historic Photographic Messier Marathon on March 19/20, 1988.
		Jan Wisniewski took this image of open cluster M39 in Cygnus.
		Image of M39 by Michael Oates of the Manchester Astronomical Society.
	www.obspm.fr /messier/more/m039_m2.html (101 words)

	The Citizen Scientist
		Most observers should be able to locate the open cluster M39 northeast of Deneb.
		Look for the globular cluster M71 between gamma and delta Sagittae.
		Telescopium and Pavo contain some globular clusters, but it is the faint galaxies that really hold sway.
	www.sas.org /tcs/weeklyIssues_2006/2006-07-28/eos/index.html (766 words)

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