List of open clusters
Introduction The open cluster Messier 6 in the constellation Scorpius is also known as the Butterfly Cluster or NGC 6405This is a '''list of open clusters''' located in the Milky Way. An open cluster is a gravitationally bound association of up to a few thousand stars that all formed from the same giant molecular cloud. There are over 1,000 known open clusters in the Milky Way galaxy, but the actual total may be up to ten times higher. The estimated half-lives of clusters, after which half the original cluster members will have been lost, range from 150 million to 800 million years, depending on the original density.ClusteridentifierConstellationDistance(parsecs)Age(Myr)DiameterApparentmagnitudeNotesEpoch J2000R. A.Dec.HyadesTaurus47625330'0.5Coma Star ClusterComa Berenices86400-500120'1.8Trapezium ClusterOrion4120.30.783'4.0Messier 6, Butterfly ClusterScorpius4879420'4.2Messier 7Scorpius28022480'3.3Messier 11, Wild Duck ClusterScutum1,90025013'5.8Messier 16, Eagle NebulaSerpens1,8001.36'6.0Messier 18Sagittarius1,296175'6.9Messier 21Sagittarius1,2051214'5.9Messier 23Sagittarius62830030'5.5Messier 24Sagittarius3,07022090'2.5Messier 25Sagittarius6209230'4.6Messier 26Scutum1,600857'8.0Messier 34Perseus49918036'5.2Messier 35Gemini91218025'5.0Messier 36Auriga1,3302510'6.0Messier 37Auriga1,40034714'5.6Messier 38Auriga1,40031620'6.4Messier 39Cygnus31128030'4.6Messier 41Canis Major71024040'4.5Messier 44, Beehive ClusterCancer18783070'3.1Messier 45, PleiadesTaurus136125120'1.2Messier 46Puppis1,51025020'6.1Messier 47Puppis4907325'4.4Messier 48Hydra77040030'5.8Messier 50Monoceros1,00013014'5.9Messier 52Cassiopeia1,400160156.9Messier 67Cancer9084,00025'6.9Messier 93Puppis103739010'6.2Messier 103Cassiopeia3,000165'7.4IC 2602, Southern PleiadesCarina16730100'1.9IC 2391, Omicron Velorum ClusterVela1763060'2.5NGC 2451 APuppis1895045'2.8Alpha Persei ClusterPerseus17250300'1.2Arp-Madore 2Puppis8,8705,0001.3'Blanco 1Sculptor25310090'4.5Hodge 301Dorado51,400250.5'11Lambda Orionis ClusterOrion43852.8Pi Puppis ClusterPuppis31950'2.1Melotte 186Ophiuchus200100240'3.0NGC 2070Dorado48,5001.53.5'7.25NGC 2232Monoceros3255345'3.9IC 4756Serpens33050040'4.6NGC 2516, Southern Beehive ClusterCarina34614130'3.8IC 4665Ophiuchus3524370'4.2Trumpler 10Vela3653514'4.6NGC 6633Ophiuchus37566020'4.6IC 348Perseus385447'7.3NGC 752Andromeda4001,700–2,00075'5.7NGC 3532, Wishing Well ClusterCarina40531650'3.0Collinder 121Canis Major60050'2.6Collinder 140Canis Major4103542'3.5Collinder 261Musca2,5008,0009'10.7 NGC 2547Vela4333825'4.7NGC 6281Scorpius4792208'5.4NGC 225Cassiopeia65713012'7.0NGC 5662Centaurus6667030'5.5NGC 5460Centaurus67816036'5.6NGC 189Cassiopeia752103.7'8.8NGC 6025Triangulum Australe75613014'5.1IC 5146Cygnus85219'7.2NGC 2301Monoceros85816512'6.0IC 4651Ara8881,90010'6.9NGC 6087, S Normae ClusterNorma8917014'5.4NGC 3114Carina91112436'4.2NGC 2509Puppis912Uncertain10'9.3NGC 2264Monoceros9131.540'3.9NGC 1502Camelopardalis1,000108'5.7Berkeley 59Cepheus1,0002180'NGC 2169Orion1,052125'5.9NGC 6242Scorpius1,131509'6.4NGC 381Cassiopeia1,1483207'9.3NGC 6204Ara1,200796'8.2NGC 6231Scorpius1,243614'2.6NGC 2439Puppis1,300259'6.9NGC 6067Norma1,41717014'5.6NGC 2362, Tau Canis Majoris ClusterCanis Major1,4804–55'4.1NGC 6756Aquila1,507624'4.5NGC 6031Norma1,5101173'8.5NGC 2175Orion1,6278.95'6.8NGC 188Cepheus1,6606,60017'8.1NGC 2244Monoceros1,6601.930'4.8NGC 129Cassiopeia1,6707621′6.5NGC 2360, Caroline's ClusterCanis Major1,8871,00013'7.2NGC 6834Cygnus1,930765'7.8NGC 659Cassiopeia1,938355'7.9NGC 4755, Jewel Box Crux1,9761410'4.2NGC 6200Ara2,0568.512'7.4NGC 869Perseus2,0791218'3.7NGC 637Cassiopeia2,160104.2'8.2NGC 2355Gemini2,2009555'9.7NGC 2129Gemini2,200105'6.7NGC 663Cassiopeia2,4202514'7.1NGC 457Cassiopeia2,4292120'6.4NGC 2204Canis Major2,62978713'8.6NGC 884Perseus2,9401418'3.8NGC 1931Auriga3,086103'10.1NGC 1980Orion5504.714'2.5NGC 2158Gemini5,0711,0545'8.6Teutsch 2Auriga5,7009002'11NGC 6791Lyra5,8538,90016'9.5NGC 3293Carina2,75088'4.7NGC 3766, Pearl ClusterCentaurus17451412'5.3NGC 7419Cepheus2,8002'13NGC 7789, White Rose ClusterCassiopeia2,3371,70016'6.7Gaia 1Canis Major4,6006,30013'8.3Ru 7Canis Major
See also * Lists of astronomical objects* List of globular clusters* Lists of clusters
References