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Topic: Open Cluster NGC 4755

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	[No title] (Site not responding. Last check: 2007-10-12)
		Astrophys.J. 78 Christian,C.A.,Janes,K.A. :1979, UBV photometry of the anticenter cluster Berkeley 21.
		227 Hassan,S.M. :1976a, UBV photometry of the galactic cluster Mel 71.
		312 Lloyd Evans,T. :1978, The open cluster NGC 6383.
	cdsweb.u-strasbg.fr /viz-bin/ftp-index?/ftp/cats/aliases/O/OCl_1_/refs (7557 words)

	Jewel Box - Wikipedia, the free encyclopedia
		The Jewel Box (also known as Open Cluster NGC 4755, NGC 4755, Kappa Crucis, or the Kappa Crucis Cluster) is an open cluster in the Crux constellation.
		It was one of the finest open clusters discovered by Nicolas Louis de Lacaille when he was in South Africa during 1751–1752.
		This cluster is one of the youngest known, with an estimated age of only 7.1 million years.
	en.wikipedia.org /wiki/Open_Cluster_NGC_4755 (263 words)

	Open Clusters
		Open clusters (relative to globular clusters) are young clusters of metal rich Population I stars.
		NGC 2264, the cluster associated with the famous cone nebula in Monoceros, is a very young cluster of stars lying in front of and slightly embedded in a dark cloud, about 740 to 800 pc (2400 — 2600 light years) away.
		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)

	NGC 4755 (Kappa Crucis) (Site not responding. Last check: 2007-10-12)
		Open Cluster NGC 4755 (= Lacaille II.12 = Dunlop 301) in Crux
		This cluster was one of the finest open clusters discovered by Abbe Lacaille when he was in South Africa during 1751-1752.
		This cluster is one of the youngest known, with an estimated age of only 7.1 million years (Sky Catalog 2000).
	www.seds.org /messier/xtra/ngc/n4755.html (251 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 (1110 words)

	OpenClusters (Site not responding. Last check: 2007-10-12)
		NGC 1857 is a relatively neglected and unstudied object.
		As is the case with almost all open clusters, there is a red star near the center of the group — a 7th magnitude K3 giant.
		This is one of the showiest open clusters in the southern sky.
	www.belmontnc.4dw.net /openclusters.htm (5657 words)

	ESA Science & Technology: XMM-Newton views a cluster of jewels
		Open clusters are groups of stars formed together in the spiral arms of a galaxy and held together by mutual gravitational attraction.
		Open cluster NGC 2516, and even its constituent stars, is clearly visible to the naked eye.
		The open cluster was chosen as a calibration target for XMM-Newton because the locations of each of these stars is already determined with a very high precision by other ground-based and space-borne observatories, including NASA's Chandra.
	sci.esa.int /content/news/index.cfm?aid=1&cid=1&oid=18715 (586 words)

	NGC 4755 The Jewel Box Cluster (Site not responding. Last check: 2007-10-12)
		NGC 4755 is situated just to the east of the bright star beta crucis.
		NGC 4755 is a compact and rich cluster with a deep orange star near the centre.
		Since it is a small cluster, moderate magnification can be used when observing it, which helps darken the sky background, and rendering the view all the more beautiful.
	www.montgomerycollege.edu /faculty/~mclark/public_html/4755.htm (247 words)

	DOC: Uranometria chart 427
		The cluster NGC 3293 whose corrected position is 10h 32.0m -57 43' (1900) is situated towards the edge of the nebula and contains [magnitudes in the second column are photographic and the number in the last column is the distance modulus]:
		Although one of the finest open clusters in the sky, NGC 3532 is almost unknown to observers in the northern hemisphere...
		On the cluster's western side is a less prominent irregular dark patch, part of a larger stream of dark nebulosity coming in from the south-east.
	www.fortunecity.com /roswell/borley/49/u427.htm (5475 words)

	NGC 4755: A Jewel Box of Stars
		One of the bright central stars is a red supergiant, in contrast to the many blue stars that surround it.
		Open clusters are younger, contain few stars, and contain a much higher fraction of blue stars than do globular clusters.
		Open Cluster NGC 290: A Stellar Jewel Box
	www.astronet.ru /db/xware/msg/1169029 (178 words)

	Astrophysical Objects Image Archive (Site not responding. Last check: 2007-10-12)
		The red HII region with its young cluster is surrounded by a blue reflection nebula.
		This is the Helix nebula, a planetary nebula in NGC 7293.
		This is the Eagle nebula, surrounding the open cluster M 16, in NGC 6611.
	www.windows.ucar.edu /tour/link=/the_universe/astro_obj_il.html (952 words)

	Star Clusters (Site not responding. Last check: 2007-10-12)
		Star clusters are both the youngest and oldest easily recognisable objects in the Galaxy.
		Globular clusters, like the magnificent southern naked-eye cluster 47 Tucanae (alongside) are the oldest star clusters known, with ages comparable with the age of the Universe itself.
		In contrast, young clusters such as NGC 3292 (AAT 10) are just a few million years old, brash newcomers in the Milky Way, and still associated with the gas and dust from which they have so recently formed.
	www.elk.itu.edu.tr /~batman/astronom/astro_img/clusters.html (153 words)

	XMM-Newton views a cluster of jewels
		At a distance of 1.300 light years from Earth, the cluster is one of several situated in the Carina constellation which contains the second-brightest star in the sky, Canopus (Alpha Carinae).
		An average open cluster spreads most of its member stars along its path after several hundred million years.
		Its multi-colored appearance has led it to be called 'the southern jewel box', although other open clusters (such as NGC 4755) have also been described the same way.
	heasarc.gsfc.nasa.gov /docs/xmm_lc/archive/2000/05_08.html (590 words)

	Andrew Pierce; Molokai Observing Report -- Part 2 (Site not responding. Last check: 2007-10-12)
		I found NGC 5128, an irregular galaxy which is also the radio source Centaurus A. It certainly looked irregular.
		Next were open clusters in Scorpius, NGC 6231, NGC 6242 and Coll 316.
		Coll 316 is catchy in binos, but NGC 6231 is a very striking compact cluster in the scope.
	observers.org /reports/2000.05.29.html (676 words)

	Open College - Hutchinson encyclopedia article about Open College (Site not responding. Last check: 2007-10-12)
		In the UK, a network launched in 1987 by the Manpower Services Commission (now the Training Agency) to enable people to gain and update technical and vocational skills by means of distance teaching, such as correspondence, radio, and television.
		Open College North West (adult college, Lancashire, UK)
		This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
	encyclopedia.farlex.com /Open+College (108 words)

	NGC 4755 The Jewel Box (Site not responding. Last check: 2007-10-12)
		NGC 4755 is a magnitude 4.2 open star cluster located near the Southern Cross.
		It is a brilliant galactic cluster popularly known as the Jewel Box.
		The Jewel Box is a relatively young star cluster with an age of no more than a few million years.
	members.cox.net /~sidleach/ngc4755.htm (163 words)

	Circumpolar South
		NGC 3532, a HUGE open cluster of magnitude 3 and angular size of nearly one degree: 11h 6m, -58.6 deg
		NGC 3293, another large open cluster of magnitude 4.8 and angular size of 1/2 degree: 10h 36m, -58.2 deg
		The globular star cluster 47 Tuscanae (NGC 104) lies near the edge of the SMC (by optical alignment only -- it is much closer than the SMC and is part of our own Milky Way galaxy).
	www.gecdsb.on.ca /d&g/astro/html/South-CP.html (996 words)

	Artigos IF-UFRGS 2006
		Mass functions and structure of the young open cluster NGC6611.
		Radiatively inefficient accretion flow in the nucleus of NGC 1097.
		Spectral evolution of star clusters in the Large Magellanic Cloud - I. Blue concentrated clusters in the age range 40-300 Myr.
	www.if.ufrgs.br /pes/art06/art06.html (1507 words)

	Spectroscopy of quasars
		The blue line connects a typical cluster star with the beginning of its spectrum.
		The red line lies between the image of the bright red supergiant star in the cluster, and the position where its spectrum would start if it were in fact a hot, blue star.
		However, it is a cool, red star, and its spectrum is deficient in the shorter wavelengths; the yellow line shows where the spectrum of this red star actually begins.
	www.physics.adelaide.edu.au /~pmcgee/starspec.htm (456 words)

	Southern_Skies
		Just north of the center of this cross is a small, condensed and populus open cluster, NGC 3766, quite a jewel to adorn such a faint cross.
		The third jewel is the so-called "jewelbox" cluster, NGC 4755.
		I did see a very small cluster off the East end of the Cross, with the brighter stars forming yet another triangle pattern, the fainter stars crowded towards one side of the triangle, and the star at the opposite point being a noticeable orange color.
	www.jplrecclubs.caltech.edu /astron/images/din/So_Skies_Images/Southern_Skies.html (1775 words)

	Splendors of the Universe 6 (Site not responding. Last check: 2007-10-12)
		NGC 6164-65, a nebula around a bright star
		The Rosette Nebula and NGC 2244 cluster (wide field)
		NGC 2818A, a planetary nebula and open cluster, NGC 2818
	www.aao.gov.au /AAO/images/general/splendors8.html (57 words)

	The Citizen Scientist
		This large open cluster is best viewed with binoculars or a very wide field telescope.
		The region visible in March has little to explore except the faint but distinct open cluster M48 that hovers in the dark zone near Monoceros.
		In contrast, Crux, cradled by Centaurus, has bright stars, a stunning compact open cluster (NGC 4755, the Jewel Box) exhibiting a variety of star color types, and the Coalsack, the most distinct dark nebula in the sky.
	www.sas.org /tcs/weeklyIssues_2006/2006-02-24/eos (502 words)

	Constellations (Site not responding. Last check: 2007-10-12)
		Nebulae NGC 6992 (part of the Veil Nebula), the Cygnus Rift or Northern Coalsack and NGC 7000, the North America Nebula
		Open clusters M50 (NGC 2323), NGC 2232, NGC 2244 surrounded by the faint Rosette Nebula and NGC 2264 embedded in the Cone Nebula
		Open clusters the Double Cluster (NGC 869 and NGC 884) and M34 (NGC 1039), a large 5th mag cluster
	www.star-names.freeserve.co.uk /constellations.htm (1370 words)

	A deep UBVRI CCD photometric study of the moderately young southern open star cluster NGC 4755 = {kappa} Crucis (Site not responding. Last check: 2007-10-12)
		J/A+AS/111/75 J/A+AS/111/75 UBVRI CCD photometry of NGC 4755
		The center of Region 1 is located ~3.2 arcmin south-west while that of Region 2 ~3.5 arcmin north-east to the cluster center marked by Dachs and Kaiser (1984).
		The candidates for pre-main sequence stars are identified as PMS in the last column.
	www.cs.wisc.edu /niagara/data/nasa/A+AS_111_75.xml (163 words)

	Jewel Box (NGC 4755)
		An open cluster of about 100 stars in the constellation Crux, also known as the Kappa Crucis Cluster after its most prominent member, a blue supergiant (visual magnitude 5.89, absolute magnitude -6.10, spectral type B5Ia).
		Located near Beta Crucis, the Jewel Box was discovered by Nicolas Lacaille when he was in South Africa in 1751-52.
		It is one of the youngest clusters known with an estimated age of less than 10 million years.
	www.daviddarling.info /encyclopedia/J/Jewel_Box.html (145 words)

	Astronomy Lecture Notes - Star Clusters (Site not responding. Last check: 2007-10-12)
		Small systems (a few pc across), with hundreds or thousands of stars; Most crowded groups of blue stars in the galactic disk are open clusters, although some star patterns (asterisms) fool us into thinking they are clusters [like NGC 6997].
		Many open clusters are young (like NGC 6188, or NGC 2244).
		In our galaxy, at least 10 billion yr; Some other galaxies have young, blue globular clusters (such as NGC 1850 in LMC, and Stephan's Quintet) formed during galaxy interactions, but most were formed very early on.
	www.olemiss.edu /courses/astr103/Topics-Extrasolar/Clusters-N.html (355 words)

	Astronomy a Go-Go!
		The Coma cluster (Mel 111) in Coma Berenice just north of Leo's tail Denebola and Open cluster NGC 4755 in Crux
		NGC 5128 is easily found halfway between Omega and Iota Centauri.
		Lyra - the Lyra or Harp - Lyra the Lyre or Harp is the instrument invented by Hermes (Mercury) and given to Apollo his half-brother, who in turn gave it to his son Orpheus, the musician of the Argonauts.
	astronomy.libsyn.com /index.php?post_category=Stars (816 words)

	Catalogue: J/A+AS/111/75
		J/A+AS/111/75 UBVRI CCD photometry of NGC 4755 (Sagar+, 1995) ================================================================================ A deep UBVRI CCD photometric study of the moderately young southern open star cluster NGC 4755 = {kappa} Crucis SAGAR R., CANNON R.D.
		Note (1): The center of Region 1 is located ~3.2 arcmin south-west while that of Region 2 ~3.5 arcmin north-east to the cluster center marked by Dachs and Kaiser (1984).
		Note (2): Stars observed by Arp and van Sant (1958) and Dachs and Kaiser (1984) in the photoelectric and photographic system have been prefixed with AV and DK respectively.
	cdsweb.u-strasbg.fr /viz-bin/Cat?J/A+AS/111/75 (369 words)

	APOD: 2001 June 18 - NGC 4755: A Jewel Box of Stars (Site not responding. Last check: 2007-10-12)
		APOD: 2001 June 18 - NGC 4755: A Jewel Box of Stars
		Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
		light-years away, so the light that we see today was emitted from the cluster before even the
	antwrp.gsfc.nasa.gov /apod/ap010618.html (130 words)

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