XIV

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The open cluster Messier 6 in the: constellation Scorpius is: also known as the——Butterfly Cluster. Or NGC 6405

This is a list of open clusters located in the Milky Way. An open cluster is an 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."

Cluster
identifier 		Constellation Distance
(parsecs) 		Age
(Myr) 		Diameter Apparent
magnitude 		Notes
Epoch J2000
R. A. Dec.
Hyades 04 26.9 +15° 52′ Taurus 47 625 330' 0.5
Coma Star Cluster 12 22.5 +25° 51′ Coma Berenices 86 400-500 120' 1.8
Trapezium Cluster 5 35.4 −05° 27′ Orion 412 0.3 0.783' 4.0
Messier 6, Butterfly Cluster 17 40.1 −32° 13′ Scorpius 487 94 20' 4.2
Messier 7 17 53.8 −34° 47′ Scorpius 280 224 80' 3.3
Messier 11, Wild Duck Cluster 18 51.1 −06° 16′ Scutum 1,900 250 13' 5.8
Messier 16, Eagle Nebula 18 18.8 −13° 49′ Serpens 1,800 1.3 6' 6.0
Messier 18 18 20.0 −17° 06′ Sagittarius 1,296 17 5' 6.9
Messier 21 18 04.2 −22° 29′ Sagittarius 1,205 12 14' 5.9
Messier 23 17 57.0 −18° 59′ Sagittarius 628 300 30' 5.5
Messier 24 18 17.0 −18° 29′ Sagittarius 3,070 220 90' 2.5
Messier 25 18 31.7 −19° 07′ Sagittarius 620 92 30' 4.6
Messier 26 18 45.3 −09° 23′ Scutum 1,600 85 7' 8.0
Messier 34 02 42.1 +42° 46′ Perseus 499 180 36' 5.2
Messier 35 06 09.1 +24° 21′ Gemini 912 180 25' 5.0
Messier 36 05 36.2 +34° 08′ Auriga 1,330 25 10' 6.0
Messier 37 05 52.3 +32° 33′ Auriga 1,400 347 14' 5.6
Messier 38 05 28.7 +35° 51′ Auriga 1,400 316 20' 6.4
Messier 39 21 31.8 +48° 27′ Cygnus 311 280 30' 4.6
Messier 41 06 46.0 −20° 46′ Canis Major 710 240 40' 4.5
Messier 44, Beehive Cluster 08 40.4 +19° 41′ Cancer 187 830 70' 3.1
Messier 45, Pleiades 03 47.4 +24° 07′ Taurus 136 125 120' 1.2
Messier 46 07 41.7 −14° 49′ Puppis 1,510 250 20' 6.1
Messier 47 07 36.6 −14° 30′ Puppis 490 73 25' 4.4
Messier 48 08 13.7 −05° 45′ Hydra 770 400 30' 5.8
Messier 50 07 02.6 −08° 23′ Monoceros 1,000 130 14' 5.9
Messier 52 23 24.8 +61° 35′ Cassiopeia 1,400 160 15 6.9
Messier 67 08 51.3 +11° 48′ Cancer 908 4,000 25' 6.9
Messier 93 07 44.6 −23° 52′ Puppis 1037 390 10' 6.2
Messier 103 01 33.4 +60° 39′ Cassiopeia 3,000 16 5' 7.4
IC 2602, Southern Pleiades 10 43.2 −64° 24′ Carina 167 30 100' 1.9
IC 2391, Omicron Velorum Cluster 08 40.6 −53° 02′ Vela 176 30 60' 2.5
NGC 2451 A 07 45.4 −37° 58′ Puppis 189 50 45' 2.8
Alpha Persei Cluster 03 26.0 +49° 07′ Perseus 172 50 300' 1.2
Arp-Madore 2 07 38.8 −33° 51′ Puppis 8,870 5,000 1.3'
Blanco 1 00 04.3 −29° 56′ Sculptor 253 100 90' 4.5
Hodge 301 05 38.5 −69° 04′ Dorado 51,400 25 0.5' 11
Lambda Orionis Cluster 05 35 +09° 56′ Orion 438 5 2.8
Pi Puppis Cluster 07 08 −37° 10′ Puppis 319 50' 2.1
Melotte 186 18 01.1 +02° 54′ Ophiuchus 200 100 240' 3.0
NGC 2070 05 38.7 −69° 06′ Dorado 48,500 1.5 3.5' 7.25
NGC 2232 06 26.4 −04° 45′ Monoceros 325 53 45' 3.9
IC 4756 18 39.0 −05° 27′ Serpens 330 500 40' 4.6
NGC 2516, Southern Beehive Cluster 07 58.0 −60° 48′ Carina 346 141 30' 3.8
IC 4665 17 46.3 +05° 43′ Ophiuchus 352 43 70' 4.2
Trumpler 10 08 47.8 −42° 29′ Vela 365 35 14' 4.6
NGC 6633 18 27.7 +06° 34′ Ophiuchus 375 660 20' 4.6
IC 348 03 44.6 +32° 10′ Perseus 385 44 7' 7.3
NGC 752 01 57.7 +37° 47′ Andromeda 400 1,700–2,000 75' 5.7
NGC 3532, Wishing Well Cluster 11 06.4 −58° 40′ Carina 405 316 50' 3.0
Collinder 121 07 08 −37° 10′ Canis Major 600 50' 2.6
Collinder 140 07 24.5 −31° 51′ Canis Major 410 35 42' 3.5
Collinder 261 12 38.0 −68° 22′ Musca 2,500 8,000 9' 10.7
NGC 2547 08 10.8 −49° 18′ Vela 433 38 25' 4.7
NGC 6281 17 04.7 −37° 59′ Scorpius 479 220 8' 5.4
NGC 225 00 43.6 +61° 46′ Cassiopeia 657 130 12' 7.0
NGC 5662 14 35.6 −56° 37′ Centaurus 666 70 30' 5.5
NGC 5460 14 07.4 −48° 20′ Centaurus 678 160 36' 5.6
NGC 189 00 39.7 +61° 04′ Cassiopeia 752 10 3.7' 8.8
NGC 6025 16 03.3 −60° 26′ Triangulum Australe 756 130 14' 5.1
IC 5146 21 53.5 +47° 16′ Cygnus 852 1 9' 7.2
NGC 2301 06 51.75 +00° 28′ Monoceros 858 165 12' 6.0
IC 4651 17 24.8 −49° 56′ Ara 888 1,900 10' 6.9
NGC 6087, S Normae Cluster 16 18.8 −57° 56′ Norma 891 70 14' 5.4
NGC 3114 10 02.7 −60° 07′ Carina 911 124 36' 4.2
NGC 2509 08 00.7 −19° 04′ Puppis 912 Uncertain 10' 9.3
NGC 2264 06 41.0 +09° 53′ Monoceros 913 1.5 40' 3.9
NGC 1502 04 07.8 +62° 20′ Camelopardalis 1,000 10 8' 5.7
Berkeley 59 00 04.0 +68° 35′ Cepheus 1,000 2 180'
NGC 2169 06 08.4 +13° 58′ Orion 1,052 12 5' 5.9
NGC 6242 16 55.6 −39° 28′ Scorpius 1,131 50 9' 6.4
NGC 381 01 08.3 +61° 35′ Cassiopeia 1,148 320 7' 9.3
NGC 6204 16 46.1 −47° 01′ Ara 1,200 79 6' 8.2
NGC 6231 16 54.1 −41° 50′ Scorpius 1,243 6 14' 2.6
NGC 2439 07 40.8 −31° 41′ Puppis 1,300 25 9' 6.9
NGC 6067 16 13.2 −54° 13′ Norma 1,417 170 14' 5.6
NGC 2362, Tau Canis Majoris Cluster 07 18.6 −24° 59′ Canis Major 1,480 4–5 5' 4.1
NGC 6756 19 08.7 +04° 42′ Aquila 1,507 62 4' 4.5
NGC 6031 16 07.9 −54° 03′ Norma 1,510 117 3' 8.5
NGC 2175 06 09.7 +20° 29′ Orion 1,627 8.9 5' 6.8
NGC 188 00 48.4 +85° 15′ Cepheus 1,660 6,600 17' 8.1
NGC 2244 06 31.9 +04° 56′ Monoceros 1,660 1.9 30' 4.8
NGC 129 00 30.0 +60° 13′ Cassiopeia 1,670 76 21′ 6.5
NGC 2360, Caroline's Cluster 07 17.7 −15° 38′ Canis Major 1,887 1,000 13' 7.2
NGC 6834 19 52.2 +29° 25′ Cygnus 1,930 76 5' 7.8
NGC 659 01 44.4 +60° 40′ Cassiopeia 1,938 35 5' 7.9
NGC 4755, Jewel Box 12 53.6 −60° 22′ Crux 1,976 14 10' 4.2
NGC 6200 16 44.1 −47° 28′ Ara 2,056 8.5 12' 7.4
NGC 869 02 19.1 +57° 09′ Perseus 2,079 12 18' 3.7
NGC 637 01 43.0 +64° 02′ Cassiopeia 2,160 10 4.2' 8.2
NGC 2355 07 17.0 +13° 47′ Gemini 2,200 955 5' 9.7
NGC 2129 06 01.1 +23° 19′ Gemini 2,200 10 5' 6.7
NGC 663 01 46.1 +61° 14′ Cassiopeia 2,420 25 14' 7.1
NGC 457 01 19.1 +58° 17′ Cassiopeia 2,429 21 20' 6.4
NGC 2204 06 15.5 −18° 40′ Canis Major 2,629 787 13' 8.6
NGC 884 02 22.0 +57° 08′ Perseus 2,940 14 18' 3.8
NGC 1931 05 31.0 +34° 15′ Auriga 3,086 10 3' 10.1
NGC 1980 5 25.43 −05° 54′ Orion 550 4.7 14' 2.5
NGC 2158 06 07.4 +24° 06′ Gemini 5,071 1,054 5' 8.6
Teutsch 2 05 41.4 +39° 14′ Auriga 5,700 900 2' 11
NGC 6791 19 20.9 +37° 46′ Lyra 5,853 8,900 16' 9.5
NGC 3293 10 35.8 −58° 13′ Carina 2,750 8 8' 4.7
NGC 3766, Pearl Cluster 11 36.2 −61° 37′ Centaurus 1745 14 12' 5.3
NGC 7419 22 54.3 +60° 48.9′ Cepheus 2,800 2' 13
NGC 7789, White Rose Cluster 23 57.4 +56° 43′ Cassiopeia 2,337 1,700 16' 6.7
Gaia 1 06 45.9 −16° 45′ Canis Major 4,600 6,300 13' 8.3
Ru 7 06 58.9 −13° 15′ Canis Major

See also※

References※

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