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Topic: NGC 869

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	Cosmic Voyage-The Online Resource for Amateur Astronomers (Site not responding. Last check: 2007-11-06)
		NGC 869 is west of center and NGC 884 is east of center.
		NGC 869 is a 5.3 magnitude object with 150 stars dusted across a 29' area, according to Lynga.
		NGC 884 is anchored by several 6th and 7th magnitude stars, including 6.4 magnitude HD 14433.
	members.aol.com /billferris/n869884.html (200 words)

	IAAC Observations Matching Your Criteria
		(IAAC) Obj: NGC 6318 - Inst: Orion 6" Dob
		(IAAC) Obj: NGC 6522 - Inst: Orion 6" Dob
		(IAAC) Obj: SN 1999by in NGC 2841 - Inst: Meade LX10 8" SCT
	www.visualdeepsky.org /search.cgi?catalogs=NGC&ids=869 (12507 words)

	Caldwell 14 / NGC 869 + 884 - Open Clusters in Perseus (Site not responding. Last check: 2007-11-06)
		NGC 869 is about 30' in size with clearly brighter center.
		NGC 869 is rather compact, very rich and consentrated towards two 6th magnitude stars in the middle of the cluster.
		NGC 869: This is of same size and magnitude then 884.
	www.kolumbus.fi /jaakko.saloranta/Deepsky/Caldwell/Caldwell14.html (399 words)

	Deepsky observing report NGC 869, NGC 884, Stock 2, M31, NGC 752, Harrington's STAR 14, M27, M1, M36, M38, NGC 1907, ...
		NGC 1907, M35, NGC 2158, M78, M42, M43, M97, M108, M81, M82.
		NGC 752 is a large cluster with a diameter of 50′and some 60 members.
		NGC 2158 is one of the most remote open clusters that can be seen with small to medium aperture telescopes.
	www.backyard-astro.com /deepsky/2003_09_25/ITTday1.html (2726 words)

	SCYON: Paper abstracts (Site not responding. Last check: 2007-11-06)
		The extinction law and the variation of colour excess with position, luminosity as well as spectral class in young open star clusters NGC 663, NGC 869, NGC 884, NGC 1502, NGC 1893, NGC 2244, NGC 2264, NGC 6611, Tr 14, Tr 15, Tr 16, Coll 228, Tr 37 and Be 86 have been studied.
		Its value ranges from 0.22 to 1.03 mag in clusters under study, which indicates that non-uniform extinction is present in all the clusters.
		It is also found that the differential colour excess in open clusters, which may be due to the presence of gas and dust, decreases systematically with the age of clusters indicating that matter is used either in star formation or blown away by hot stars or both.
	obswww.unige.ch /webda/scyon/Yadav.html (329 words)

	Double Cluster, NGC 869 & NGC 884
		The best estimate for the age of NGC 869 is 6.4 million years, while NGC 884 is about 11.5 million years old.
		NGC 884 is somewhat farther away, at 8,150 light years.
		NGC 869 is estimated to be 7,000 light years distant.
	www.kopernik.org /images/archive/n869dc.htm (305 words)

	NGC 869 and NGC 884 The Double Cluster
		While star clusters are neat in themselves, this pair of open clusters, NGC 869 and NGC 884, are doubly interesting.
		According to Sky Catalog 200, the ages for NGC 869 and NGC 884 are 5.6 and 3.2 million years.
		The air mass values were 1.17 and 1.18 for NGC 869 and NC 884, respectively.
	www.macalester.edu /astronomy/research/phys20/CM99/chrism.html (563 words)

	APOD: 2003 December 2 - NGC 869 and NGC 884: A Double Open Cluster (Site not responding. Last check: 2007-11-06)
		APOD: 2003 December 2 - NGC 869 and NGC 884: A Double Open Cluster
		Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
		Open clusters NGC 869 and NGC 884, however, are doubly impressive.
	antwrp.gsfc.nasa.gov /apod/ap031202.html (99 words)

	NGC 869, NGC 884
		As they point out, since the 1840s, the name "Chi" is attributed to NGC 884, and "h" to NGC 869.
		However, these authors point out that very probably, Tycho Brahe measured one position for the "nebulous star" that is actually the double cluster, and Johann Bayer designated this "star" as Chi.
		Both clusters are listed in the SAC 110 best NGC object list.
	www.seds.org /messier/xtra/ngc/n0869.html (283 words)

	NGC 869
		It is believed that eventually the component stars of open clusters slowly drift apart and disperse.
		NGC 869 is one of two open clusters that make up the famous double cluster in the constellation Perseus.
		The Double Cluster is a naked eye object in dark rural areas and is a beautiful sight in binoculars and amateur telescopes.
	www.astrophoto.net /ngc869.html (212 words)

	APOD: January 29, 1997 - NGC 869 & NGC 884: A Double Open Cluster (Site not responding. Last check: 2007-11-06)
		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.
		The clusters are over 7000 light years distant toward the constellation of Perseus, but are separated by only hundreds of light years.
	antwrp.gsfc.nasa.gov /apod/ap970129.html (123 words)

	The Perseus Double Cluster of Stars (Site not responding. Last check: 2007-11-06)
		The Perseus double cluster is a rich pair of open star clusters that are a spectacular sight even in binoculars.
		The cluster on the left in the above photo is NGC 869, a magnitude 5.3 open cluster of about 200 stars about 29 arcminutes in diameter.
		The cluster on the right in the above photo is NGC 884, a magnitude 6.1 open cluster of about 115 stars, having a size of about 29 arcminutes in diameter.
	members.cox.net /sidleach/ngc869.htm (150 words)

	NGC 869 and 884 - The Double Cluster in Perseus (Site not responding. Last check: 2007-11-06)
		NGC 869 and 884 - The Double Cluster in Perseus
		The famous double star cluster in the constellation Perseus was known in antiquity, first cataloged by the Greek astronomer Hipparcos in 130 B.C. Both clusters are at a distance from us of over 7000 light years, but only a few hundred light years apart.
		NGC 869 is listed at 5.6 million years and NGC 884 at 3.2 million years (Sky Catalog 2000).
	www.www.machunter.org /hap_dbl_cluster_wide.html (157 words)

	Circumpolar North (Site not responding. Last check: 2007-11-06)
		We'll start with the open cluster NGC 869, which is easily observed with binoculars
		M101 (NGC 5457), the Pinwheel Galaxy, is another good object for small telescopes.
		M51 (NGC 5194), the Whirlpool Galaxy, in another of the nice Northern galaxies.
	learnt.smec.curtin.edu.au /astro/html/North-CP.html (346 words)

	Double Cluster (h and Chi Persei; NGC 869 and NGC 884)
		Double Cluster (h and Chi Persei; NGC 869 and NGC 884)
		Two young open clusters that lie close together in the sky in Perseus and are visible to the naked eye on a clear, dark night as a hazy patch of light.
		Both clusters lie in the Perseus OB1 Association and contain many B stars and M supergiants.
	www.daviddarling.info /encyclopedia/D/Double_Cluster.html (133 words)

	AllRefer.com - Perseus, in astronomy, Constellation (Constellations) - Encyclopedia
		It contains the bright star Mirfak (Alpha Persei) and Algol (Beta Persei), a visible variable star of the type known as an eclipsing variable.
		Perseus contains two star clusters (NGC 869 and NGC 884) that are visible to the naked eye, as well as an open cluster (M34) that is barely visible.
		A meteor shower known as the Perseids appears to radiate from a star in Perseus; this shower can be seen every year for several nights beginning Aug. 10, after midnight.
	reference.allrefer.com /encyclopedia/P/Perseus3.html (238 words)

	dcluster (Site not responding. Last check: 2007-11-06)
		NGC 884/869, Double Cluster, Perseus, Stellarvue SV78S f3.8, MX7C, IDAS
		H VI 34;chi Per;in Per OB1;Double Cluster w NGC 869
		H VI 33;h Per;in Per OB1;Double Cluster w NGC 884
	myweb.cableone.net /hurricane4/doublecluster.html (30 words)

	884 - APOD: 2003 December 2 - NGC 869 and NGC 884: A Double Open Cluster (Site not responding. Last check: 2007-11-06)
		Logical tab order is subjective Issue 884 depends on:, Show dependency tree · Show dependency graph.
		h Persei, NGC 869, chi Persei, NGC 884.
		A different astronomy and space science related image is featured each day, along with a brief explanation.
	www.erhome.com /?q=884 (267 words)

	Double Cluster
		It is one of my favorite deep sky objects, along with Omega Centauri and M42.
		NGC 869, also known h Persei, is on the left, with NGC 884, also known as chi Persei, on the right.
		They are both located at a distance of 7000 light-years, and are very young for star clusters, NGC 869 being 5.6 million years old, and NGC 884 being 3.2 million years old.
	webpages.charter.net /alsonwongweb/double.htm (195 words)

	Digital Images of the Sky - Constellations
		NGC 869, h Persei, Open Cluster in Perseus (right)
		NGC 884, chi Persei, Open Cluster in Perseus (left)
		NGC 1499, California Nebula, Emission Nebula in Perseus
	www.allthesky.com /constellations/perseus/dsos.html (150 words)

	M34 (NGC 1039)
		NGC 869 and NGC 884 comprise the outstanding ‘Perseus Double Cluster’, visible to the naked eye and very nicely seen in binoculars and small telescopes.
		Each cluster covers a greater area than the full moon.
		Of the two, NGC 869 (to the west) is the brighter with more members, perhaps 400 stars compared to about 300 stars for NGC 884.
	www.dibonsmith.com /ngc869.htm (80 words)

	Digital Photograph of the Double Star Cluster, NGC 869 & NGC 884 (Site not responding. Last check: 2007-11-06)
		Digital Photograph of the Double Star Cluster, NGC 869 & NGC 884
		Click here to view the full size image.
		The open cluster NGC 884 is a famous star cluster.
	www.telescopes.cc /ngc884.htm (30 words)

	NOAOpre
		Galactic-scale outflow and supersonic ram-pressure stripping in the Virgo cluster galaxy NGC 4388
		Jacoby, G.H., Morse, J.A., Fullton, L.K., Kwitter, K.B., and Henry, R.B.C. Planetary nebulae in the globular clusters Pal 6 and NGC 6441
		Walker, A.R. The LMC cluster NGC 1866 - I. A revised photometric sequence, and a reconnaissance of the surrounding field population
	www.noao.edu /noao/library/noaopre.html (4205 words)

	Double Cluster
		Please click here or on image for a higher resolution view.
		Distance: 7100 light years for NGC 869; 7400 light years for NGC 884
		The famous Double Cluster in Perseus was first cataloged by the Greek astronomer Hipparcos in 130 BC.
	www.starrywonders.com /double.html (251 words)

	Double Cluster
		When viewed in a telescope, the spectacular beauty of these two open clusters is revealed.
		Each cluster contains more than 100 stars, the brightest in NGC 884 being 8th magnitude, and the brightest in NGC 869 being about 6.6 magnitude.
		Notes: 1 sec integration with ST-4 on very faint star.
	www.astropix.com /HTML/A_FALL/DC.HTM (136 words)

	Bass Sale 2 Session 2
		Certainly the coin has many of the properties of a Proof but the somewhat rounded rims of this piece have led to our description of the coin as a prooflike specimen.
		In any case, this superb piece is clearly one of the first struck from the newly polished dies, quite possibly for presentation purposes." At the time of their offering of this coin, it was encapsulated by NGC as "Specimen MS-65."
		What is a Proof and what is not among early American coinage is not rigidly defined, and often one expert will designate a piece a Proof, while another will suggest that a prooflike business strike is more accurate.
	www.harrybassfoundation.org /basscatalogs/BASSSALE2/b2-2-d.htm (5265 words)

	Double Open Cluster - NGC 869 and NGC 884 (Site not responding. Last check: 2007-11-06)
		Double Open Cluster - NGC 869 and NGC 884
		"The Double Open Cluster" - In Perseus (NGC 869 and NGC 884)
		Photoshop - Curves, slight color balance, and unsharp mask sharpening.
	www.whirlpoolgalaxy.com /open_star_doublecluster_intro.html (53 words)

	NGC 869 & 884 - The Double Cluster (Site not responding. Last check: 2007-11-06)
		NGC 869 and 884 - The Double Cluster
		Click Image for 1/2 resolution image – color balance adjusted
		Click here for SEDs info on NGC 869 and 884
	ardenastrophotography.com /NGC869_884.html (37 words)

	PUBLICATIONS
		Hasegawa, T.I., Volk, K., and Kwok, S. A Chemical Model of the Neutral Envelope of the Planetary Nebula NGC 7027,
		Hasegawa, T.I. and Kwok, S. Molecular Line Emissions from the Photodissociation Region of NGC 7027, Astrophys.
		Kwok, S., and Su, K.Y.L. Discovery of Co-Axial Rings in the Quadrupolar Planetary Nebula NGC 6881, Astrophys.
	www.iras.ucalgary.ca /~kwok/publication.html (2540 words)

	Danville-Pittsylvania County, VA NGC Objects Web Page (Site not responding. Last check: 2007-11-06)
		The objects near the center of this picture are NGC 884 and NGC 869.
		This is also known as the Double Cluster, located 7,300 light years away, in the constellation Perseus.
		For permission to use these photographs, please contact the photographer or send e-mail to
	www.gamewood.net /astronomy/ngc (92 words)

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