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Topic: Globular Cluster M92

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Globular Cluster M13

Globular cluster

Apparent magnitude

Hercules (constellation)

Eikoh Hosoe

	Star Clusters - Globular
		Globular clusters are not formed within the galaxy structure, but usually large numbers of them form a halo around the main galactic structure.
		Globular clusters usually require a larger telescope and higher magnification to observe to best effect, although the larger and closer ones can be spectacular in small instruments.
		Stellar concentration is average for a globular cluster and it is one of the metal-richest globulars.
	www.paulandliz.org /Star_Clusters/Globulars.htm (1802 words)

	Messier 92 - Wikipedia, the free encyclopedia
		Messier 92 (also known as M92 or NGC 6341) is a globular cluster in the Hercules constellation.
		M92 is at a distance of about 26,000 light-years away from Earth.
		M92 is one of the brighter globular clusters in the northern hemisphere, but it is often overlooked by astronomers because of its proximity to the even more spectacular M13.
	en.wikipedia.org /wiki/Globular_Cluster_M92 (143 words)

	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)

	Star cluster - Wikipedia, the free encyclopedia
		Globular clusters are roughly spherical groups of anything between 10,000 and several million stars in a region about 10 to 30 light years across.
		Until recently, globular clusters were the cause of a great mystery in astronomy, as theories of stellar evolution gave ages for the oldest members of globular clusters that were greater than the estimated age of the universe.
		A few of the brightest globular clusters are visible to the naked eye, with the brightest, Omega Centauri, having been known since antiquity and catalogued as a star before the telescopic age.
	en.wikipedia.org /wiki/Star_cluster (1174 words)

	Globular cluster M92 (Site not responding. Last check: 2007-11-07)
		The bright globular cluster Messier 92 (NGC 6341) in Hercules, from a B-band CCD image obtained with the prime-focus camera on the 4-meter telescope of Kitt Peak National Observatory.
		The cluster is off-center because this was a calibration exposure, centered on a group of well-measured standard stars on the cluster's southern outskirts.
		A logarithmic intensity scale was used to simultaneously show bright and faint stars, windowed to conveniently disguise the fact that this four-minute exposure saturated the cluster core as well as a few of the brightest individual stars.
	www.astr.ua.edu /gifimages/m92b.html (110 words)

	Globular Star Clusters
		Globular clusters are gravitationally bound concentrations of approximately ten thousand to one million stars, spread over a volume of several tens to about 200 light years in diameter.
		Globular clusters typically contain a number of variable stars, in particular RR Lyrae stars which were once called "Cluster Variables" because of their abundance in globulars.
		It is perhaps a bit surprising that almost all globular clusters seem to be of about the same age; there seems to be a physical reason that they all formed in a short period of time in the history of the universe, and this period was apparently long ago when the galaxies were young.
	www.seds.org /messier/glob.html (2112 words)

	Globular Clusters
		Globular clusters are huge, spherical, gravitationally bound collections of stars.
		Thus as we look toward the central regions of the galaxy in the summer many more globular clusters are apparent than in the winter when night skies direct our gaze away from the center toward the outer reaches of the Milky Way.
		According to the figures in Deep Sky 2.0, this is the sixth brightest globular cluster in the sky.
	home.insightbb.com /~lasweb/lessons/globular.htm (1554 words)

	M92, Wide Field
		M92 is visible as a diffuse "star" in the finderscope, but less luminous and smaller than M13.
		The brightest stars of M92 are of 12th magnitude, within the range of a 4" telescope and resolvable in an instrument that size.
		M92 appears only half the size of M13, therefore higher magnifications may be applied.
	astro.nightsky.at /Photo/GlobClu/M92_Newton.html (357 words)

	[No title]
		With binoculars, the core of the cluster is resolved as bright and somewhat starlike.
		It is one of the closest globular clusters to Earth.
		It is one of the closest globular clusters, being lying 17,000 light-years away.
	www.windows.ucar.edu /the_universe/txt/const.spring (3114 words)

	Messier Object 92
		Globular Cluster M92 (NGC 6341), class IV, in Hercules
		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.
	www.seds.org /messier/m/m092.html (440 words)

	Geoff Smith's Astrophotgraphy
		Globular Clusters are gravitationally bound clusters of stars containing anything from tens of thousands to around a million stars.
		This globular has a nearby NGC companion- NGC5053, which should be visible in the same eyepiece field.
		Although a superb cluster in its own right it is overshadowed by its flashier neighbour.
	homepage.ntlworld.com /geoff.smith5/globulars.html (144 words)

	More M92 (Site not responding. Last check: 2007-11-07)
		Bright globular cluster Messier 92, represented from a B-band CCD image obtained with the prime-focus camera on the 4-meter Mayall telescope of Kitt Peak National Observatory.
		The cluster is off-center because this was a calibration exposure.
		Central region of globular cluster M92 as taken by Håkon Dahle using the 1024x1024 BroCam CCD camera with an I band filter at the 2.56-m Nordic Optical Telescope on La Palma, exposed for 100 seconds during morning twilight.
	www.obspm.fr /messier/more/m092_more.html (125 words)

	M 92 (Site not responding. Last check: 2007-11-07)
		M92 is a splendid object, visible to the naked eye under very good conditions and a showpiece for every optics.
		It is only slightly less bright but about 1/3 less extended than M13: its 11.2' angular extension corresponds to a true diameter of 85 light years, and may have a mass of up to 330,000 suns.
		Messier observed M92 on March 18th, 1781 "A fine conspicuous nebula, very bright, between the knee and left leg of Hercules.
	www.messiermarathon.com /new_page_98.htm (202 words)

	JBO - Hercules Constellation (Site not responding. Last check: 2007-11-07)
		M92 Globular Cluster B M
		M92 is also a superb globular cluster, somewhat overshadowed by its near neighbour M13. With a visual magnitude of 6.5, it is just on the limit of unaided eye visibility but really needs binoculars or a telescope to observe.
		M92 is north and a little east of the north-eastern star of the keystone, third magnitude Pi Herculis.
	www.jb.man.ac.uk /public/AList/Hercules.html (375 words)

	Globular Clusters, by Jim Scala
		Globular clusters, like leaves of a maple tree, are all the same, and yet each one is different.
		In contrast, the galactic cluster represented by M29 is a grouping of stars—a “knot” of stars in the stellar backdrop.
		Until 1946, M71 was listed as a galactic cluster because it appears more like a close group of stars, but after careful analysis, it took its place as a globular cluster only 8,500 light years away.
	www.eastbayastro.org /2000/0900/r0900-8.htm (941 words)

	Globular Clusters (Site not responding. Last check: 2007-11-07)
		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)

	Observational Data for Galactic Globular Clusters
		Interpreting colour-magnitude diagrams for clusters in terms of a star's evolutionary history remains a central problem for astrophysics even 75 years after the first diagrams were constructed and their significance shown.
		In visual observation of a globular cluster, obviously if you are going to see any resolution at all, your telescope will have to show stars at least as faint as the brightest stars in the cluster.
		The cluster reported by Djorgovski as "Djorgovski 3" is identical with NGC 6540, which was previously considered to be an open cluster.
	www.ngcic.org /papers/gctext.htm (2654 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		Globular Cluster M13 (taken with UCI 24" and ST-6 camera, 1 min.
		Globular Cluster M3 (taken with UCI 24" and ST-6 camera, 1 min.
		Globular Cluster M92 (taken with UCI 24" and ST-6 camera, 1 min.
	www.ps.uci.edu /~shoup/AstroPics/directpics.html (77 words)

	M-92, globular cluster
		Globular star cluster M-92 was discovered by J.E.Bode in December 1777; Messier's independent discovery occurred in March 1781.
		This is a beautiful rich globular cluster which in almost any other constellation would be considered a major show object; in Hercules it has been somewhat over shadowed by the splendor of the fabulous M-13.
		M-92 is rather easily observed in binoculars as a fuzzy star-like object, and rather small telescopes permit some resolution of the outer edges.
	www.kopernik.org /images/archive/m92.htm (335 words)

	Clusters
		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.
		This is a pair of globulars only a small bit apart, though not in the same field of view as the drawing might suggest.
	www.dharmaworks.net /Astronomy/clusters.html (864 words)

	STAR CLUSTER IMAGES (Site not responding. Last check: 2007-11-07)
		Luminance-layered image of globular cluster M4, made from images taken with an Apogee AP7P camera and CMY filters on 5/6/00 by Al Kelly at TSP 2000 (the Texas Star Party) in the Davis Mountains of West Texas with a 17.5" f4.5 Newtonian.
		WRGB composite of the globular cluster M22 taken by Al Kelly on 8/30/97 with CB245 and 17.5" f4.5 Newtonian from Ft. McKavett, Texas.
		Image of globular cluster M5 by Al Kelly, taken on 7/13/96 with 32" f4 Newtonian and CB245 CCD camera from Danciger, Texas.
	www.ghg.net /akelly/starclus.htm (2965 words)

	Gallery of the Globulars (Site not responding. Last check: 2007-11-07)
		Of about 120 globular clusters surrounding our Milky Way Galaxy, M15 has one of the densest centers.
		Our closest neighboring globular cluster, M4, is made of more than 100,000 stars.
		Globular cluster M92 is about 26,000 light years away from Earth, just a bit farther than its brighter neighbor, M13, in the constellation Hercules.
	scicom.ucsc.edu /SciNotes/9601/Globular/gallery.html (134 words)

	Hercules
		The brightest members of the cluster are red giants, each as bright as 2000 Suns.
		M92 is frequently neglected by observers because of it nearness to the great M13.
		However, taken on it's own merit, it is one of the most beautiful clusters in the sky.
	schmidling.com /herc.htm (719 words)

	Messier Objects 51-110 (Site not responding. Last check: 2007-11-07)
		M71 is one of the nearest globular clusters at 8,500 lty away.
		This cluster is as bright as M13, also in Hercules, but it is twice as small.
		M107 Globular Cluster in Ophiuchus.M107 is a 9th magnitude cluster about 10,000 lty away.
	www.ess.sunysb.edu /observer/mess2.html (421 words)

	Messier Object 92 (Site not responding. Last check: 2007-11-07)
		Globular Cluster M92 (NGC 6341), class IV, in
		Considering the various relations which are important for understanding stellar structure and evolution, they should also be roughly 15 % younger, in a preliminary off-hand estimate.
		For M92, Harris' globular cluster database lists an only little modified value of 26,400 (former 26,100) light years, though, so that the quoted result might stay valid after all.
	digilander.libero.it /COA/m092.htm (287 words)

	M92 Globular Star Cluster (Site not responding. Last check: 2007-11-07)
		The globular star cluster M92 in Hercules is an impressive star cluster, but is over shadowed by the great splendor of the M13 globular cluster nearby.
		M92 was discovered by J.E. Bode in December 1777.
		A Takahashi FS-128 refractor with a reducer operating at f5.9 was used to take these images.
	members.cox.net /~sidleach/m92.htm (115 words)

	M92
		Forever to be regarded as the "other" globular in the constellation Hercules, M92 doesn't get the credit it deserves.
		Visually, this object is quite apparent in scopes of all sizes in dark skies.
		While it's not quite as easy to resolve the stars at the center of the cluster as with M13, a larger scope will actually reveal more stars since the core itself appears a little more graduated, with more levels of brightness throughout the cluster itself.
	www.allaboutastro.com /M92.html (171 words)

	Caltech Astronomy : Palomar Observatory globular star cluster M92
		The globular star cluster known as M92 contains several hundred thousand stars.
		This star cluster is located within the constellation of Hercules.
		Contact the photographers directly for permission to use their images for any purpose.
	www.astro.caltech.edu /palomar/m92.html (143 words)

	Observation Notes
		The Nagler had a nice view of the cluster - not as many stars resolved and not as big as M13, but still a spectacular view - the Nagler will probably be used quite often.
		Observed this globular cluster at 9:30 PM first with the binoculars, then with the telescope.
		This globular cluster is visible as a fuzzy object in binoculars, and appears as part of a triangle of stars.
	www.isd.net /~mjs/astro/obs.html (5380 words)

	M 92 Globular (via CobWeb/3.1 planetlab2.tamu.edu) (Site not responding. Last check: 2007-11-07)
		Dreyer description: Globular cluster, very bright, very large, extremely compressed middle, well resolved, stars small; = M 92.
		Globular cluster M92 is one of the original discoveries of
		According to newer sources, M92 is about 26,000 light years distant, only little more than its brighter apparent neighbor
	www.skywatcherobservatory.com.cob-web.org:8888 /id37.htm (429 words)

	Observations of objects of type "Globular Cluster"
		In the 18" dob with bino viewers, M22 globular cluster was spectacular.
		One of the objects we examined, was M28 globular cluster.
		M28 is a small tightly packed globular cluster that seems like it is embedded in the milky way.
	www.lies.com /aaol/view_obs.cgi?type=gc (1830 words)

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