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	APOD: January 28, 1997 - Open Cluster M50 (Site not responding. Last check: 2007-10-21)
		Open clusters like M50, shown above, typically contain hundreds of stars, many of which are bright, young, and blue.
		M50 lies about 3000 light-years from Earth and is about 20 light years across.
		Open clusters tend to have irregular shapes and are mostly found in the plane of our Galaxy.
	antwrp.gsfc.nasa.gov /apod/ap970128.html (133 words)

	Star Clusters - Cover Page
		Open star clusters are so called because although the stars are organized into a group, this association is fairly loose and the stars are usually not densely packed together.
		Open clusters are the most easily seen type in a small telescope or binoculars, being often rather larger than globular clusters (see the relevant page on this site).
		Most open clusters are distributed along or close to the plane of our Milky Way galaxy's spiral disc, but M67 has been able to work its way outwards to its current position 1,500 light years out of the galactic plane.
	www.paulandliz.org /Star_Clusters/Open_Clusters.htm (1453 words)

	Robert Bruce Thompson's Winter Messier Objects Presentation - M50
		M50 is roughly 3,000 light years distant, contains about 200 stars in the main body, and has a maximum extent of about 16 by 20 arcminutes, with the bright central portion being a circle of about 16 arcminutes, or about half the diameter of the full moon.
		M50 is fairly young for an open cluster, being 78 million or so years old.
		Most open clusters respond best to a low-power, wide-field eyepiece, but M50 is bright enough and small enough that you can use moderate powers on it.
	www.ttgnet.com /astronomy/winter-messier-program/m50.html (463 words)

	M50
		Messier object M50 is a open cluster which is located in the constellation Monoceros.
		This Open Cluster has an apparent angular size of 16 and a visual brightness of 6.3.
		M50 is unnamed and has an NGC catalog number of NGC 2323.
	www.absoluteastronomy.com /messier_objects/m50.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.
		Open clusters are often typized according to a simple scheme which goes back to Harlow Shapley, which describes richness and concentration roughly (Shapley 1930):
	www.seds.org /messier/open.html (1113 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)

	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)

	APOD Index - Stars: Open Clusters (Site not responding. Last check: 2007-10-21)
		Quite evident in the above photograph are the blue reflection nebulae that surround the brighter cluster stars.
		Explanation: Galactic or open star clusters are relatively young swarms of bright stars born together near the plane of our Milky Way Galaxy.
		Aged 80 million years, M47 is a smaller but looser cluster of about 50 stars spanning 10 light-years.
	antwrp.gsfc.nasa.gov /apod/open_clusters.html (391 words)

	M 50 (Site not responding. Last check: 2007-10-21)
		This cluster was discovered on April 5, 1772 by Charles Messier, but possibly G.D. Cassini had already discovered it before 1711 (according to Kenneth Glyn Jones, and Burnham).
		The open cluster M50 is probably about 3,000 light years distant.
		Messier observed M50 on April 5th, 1772 "It was while observing the comet of 1772 that M.Messier (speaking of himself) observed this cluster." Charles Messier
	www.messiermarathon.com /new_page_56.htm (221 words)

	Sea and Sky's Astronomy Resources: Messier Objects M41 - M50
		This cluster is about 577 light years from Earth and is believed to be approximately 400 million years old.
		It is a tight cluster, containing about 50 bright stars in a region approximately 12 light years in diameter.
		The cluster is easily visible to the naked eye under ideal observing conditions.
	www.seasky.org /astronomy/astronomy_messier_41to50.html (981 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)

	[No title]
		M50 is a beautiful object which can be spotted in binoculars.
		Estimates on the number of stars in this cluster vary greatly as it is actually pretty difficult to determine the actual end of the cluster and the start of the Milky Way background.
		There are about 200 member stars in the cluster and it is estimated that the age of the cluster is around 78 million years.
	www.utahskies.org /deepsky/constellations/monoceros.html (1117 words)

	Weasner's Meade ETX Site
		The open cluster NGC 6939 was a faint glow with a few stars inside a kite- shaped asterism, and another, NGC 7510, was a wedge of about ten faint stars.
		Open cluster*: NGC 2244 was a bright gathering of some 25 stars in a rectangular pattern, highlighted by the yellowish star 12 Mon, best seen at low power.
		Open cluster*: NGC 2264 was a large, bright, conical group of some 20 stars south of the star 15 Mon, again best seen at low power.
	www.weasner.com /etx/observations/2004/etx-125_obs8.html (4793 words)

	Open Cluster M50 (NGC2323) - Star Clusters - Digital Images of the Sky (Site not responding. Last check: 2007-10-21)
		The presence of the bright blue stars shows, that this Open Cluster has a young age, because this massive, hot and short living stars are still existing.
		Partly this is due to the general tendency of the main branch in the Color-Magnitude-Diagram, that means the faint stars are low mass objects, cool and red.
		But M 50 is positioned directly in the plane of our galaxy, so we expect most faint stars not to be cluster members.
	www.allthesky.com /clusters/m50.html (238 words)

	Clusters
		This is a 3 second CCD exposure taken on February 4, 1997 using a Celestron PixCel 255 CCD Camera at f/6.3 on the Celestron C5+.
		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)

	XWare > APOD
		But open clusters NGC 869 and NGC 884 are doubly impressive.
		Also known as "h and chi Persei", this rare double cluster, shown above, is bright enough to be seen from a dark location without even binoculars.
		In fact, it is a close, large cluster of galaxies, containing several thousands of galaxies centered around a central dominant galaxy.
	www.astronet.ru /db/xware/apod.html?d=1997-01 (391 words)

	[No title]
		Open clusters - these are moderately sparse, lie in the disk and have no gas.
		Open clusters are youngish to middle aged, have blown out their gas and are usually slowly dissolving apart as the star fly off.
		Clusters of galaxies can contain hundreds or even couple of thousand of big galaxies (but are generally deficient in dwarfs and irregulars).
	www.astro.psu.edu /users/steinn/Astro1/lec25.html (3768 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)

	IC 2177 The Seagull Nebula (Site not responding. Last check: 2007-10-21)
		IC 2177 is a large but faint emission nebula on the Monoceros/Canis Major border, about 7 degrees north-east of Sirius, and about 2 degrees south of the open cluster, M50, which is visible in the photograph as a bright, compact group of stars about the nebula.
		At the northern end (top) of the nebula is the scattered cluster NGC 2335, while at the southern (bottom) end is another portion of the nebula, Sh2-297.
		To the east (left) of the main complex is another faint arc of nebulosity that appears to be an extension of the main complex.
	www.montgomerycollege.edu /~mclark/i2177.htm (190 words)

	m50AIP (Site not responding. Last check: 2007-10-21)
		M50, Monoceros, Stellarvue SV78S f6, MX7C, IDAS, 5min
		M50 is a nice open cluster well situated in the winter sky.
		The field of view with the Stellarvue is 43X34 arc minutes at prime focus of f6.
	myweb.cableone.net /hurricane4/m50.html (96 words)

	[No title]
		M50, Open Cluster in Monoceros, Mag 5.9, 16', 100 stars mag 9 -14.
		M46, Open Cluster in Puppis, Mag 6.1, 27', 150 stars mag 10 -13.
		M48, Open Cluster in Hydra, Mag 5.8, 54', 50 stars mag 9 -13.
	www.amateurastronomy.co.uk /open.html (476 words)

	M50 - Open Cluster in Monoceros
		M50 is an open cluster of stars in the constellation Monoceros.
		Its estimated population is approximately 200 stars and lies at a distance of about 3,200 light years from the Earth.
		The main body of the cluster is about 10 light years across, but the outlying stars extend another 10 light years.
	www.waid-observatory.com /m050-2006-04-07.html (131 words)

	A Thousand Wishes
		This is an easy open cluster because it's bright and you just have to glance a little below the brightest star, Sirius, to see it.
		I also took in the open cluster M48, in Hydra, since it was nearby.
		This string of open star clusters begins with M35 at the feet of Gemini, and is followed by M37, M36, and M38 in Auriga.
	www.mindspring.com /~jeffpo/wishes.htm (2208 words)

	Universe Today - What's Up This Week - March 27 - April 2, 2006
		As we open our week long tour known as a "Messier Marathon," the late rise of the Moon tonight will be on the side of observers.
		Binoculars are all that's needed to see the M34 open cluster also in Perseus, located roughly halfway between the "Demon Star" Algol and lovely double Almach, Gamma Andromeda.
		The open cluster M41 in Canis Major is found just as quickly as drifting south of the brightest star in the sky.
	www.universetoday.com /am/publish/whatsup_mar27_2006.html?2632006 (4924 words)

	Stargazing In Big Sky Country (Site not responding. Last check: 2007-10-21)
		The hot, young stars within the compact open star cluster NGC 2244, which resides at the center of the Rosette, are the source of its illumination.
		NGC 2264 is a nice open cluster with a distinctive shape that gives it its common name, “The Christmas Tree Cluster”.
		This nice open cluster is located off the “foot” of the Twin headed by Castor, within the band of the Milky Way.
	www.glacieradventure.com /StarGaze/March_04.htm (4896 words)

	Art Russell's Monthly Messier Star-Hop; March #1
		The open cluster NGC 2244 is at the right angle of a right triangle formed with 13 Monocerotis on the left end and Epsilon Monocerotis at the right end.
		From there we'll head to the open cluster M50, NGC 2323, also known as the "Galactic Smiley Face" J (I don't know which one of the club's Deep-Sky Zombies christened it: Dave Riddle, Clay McHann, or Rich Jakiel.
		The open cluster is almost entirely within the filed of view.
	education.gsu.edu /spehar/FOCUS/Astronomy/star-hop/Monthly/msh03-1.htm (1123 words)

	Jason Kalirai Research
		Open star clusters are excellent laboratories for testing various aspects of stellar astrophysics.
		Compare the color-magnitude diagrams to numerical simulations to understand the star formation history, binary fraction, and cluster properties.
		Ages of clusters from white dwarf cooling theory.
	www.ucolick.org /~jkalirai/opencluster.htm (382 words)

	Observations made in the constellation Monoceros
		The star cluster at the core of the Rosette Nebula was easy, though the nebula itself was not detected.
		NGC 2215 is a faint (8.6 magnitude according to the Herschel 400 booklet) but attractive open cluster that lies roughly between the excellent triple star Beta Monocerotis and Gamma Monocerotis.
		Misremembering which cluster in the S part of the Winter Milky Way contained a planetary nebula, I spent about 10 minutes probing M50 at high power in the 8-inch, looking for a nonexistant planetary.
	www.lies.com /aaol/view_obs.cgi?con=Mon (728 words)

	Universe Today - What's Up This Week - Mar 7 - 13, 2005
		Monday, March 7- As we open our week long tour of the "Messier Marathon", the late rise of the Moon tonight will be on the side of North American observers.
		Let's head Northwest as we take on two open clusters visible to both telescopes and binoculars.
		is a bright, compact globular cluster in Hydra that will appear as a "fuzzy star" to binoculars and a treat to the telescope.
	www.universetoday.com /am/publish/whatsup_mar7_2005.html (4207 words)

	Observatory Weekly Log
		Doug made the fortunate suggestion that we open the upper two thirds of the dome because viewing was so much better than at the horizon.
		It was often hard to determine if we were looking at a true loose cluster, a portion of the Milky Way, some stars that just happened to be where the telescope pointed or nothing much at all.
		NGC2194 in Orion is a small rich open cluster (very fine in spite of its size).
	www.frostydrew.org /observatory/dated/2002/jan.htm (3452 words)

	More M50
		Open cluster M50, a winter object for Northern hemisphere observers, as photographed by Martin Germano in January 2002.
		It is an autiguided 20 minute exposure on Ektachrome P1600 taken on Feb. 19, 1999 with Ultima 8 f/6.3 SCT from Sooke, BC.
		Wayne Johnson of the Orange County Astronomers (OCA) obtained this CCD image of open cluster M50 with the 22-inch Kuhn Telescope and OCA CCD camera.
	messier.obspm.fr /more/m050_m2.html (94 words)

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