Open star clusters are widely distributed in our galaxy and represent a loose collection of stars which number from a few dozen to a few hundred stars and are weakly-held gravitationally. Perhaps the three most famous such open clusters are the Pleiades (M45) in Taurus, the Beehive (M44) in Cancer and the double cluster in Perseus. They are all characterized with a handful of hot and white prominent stars and nebular material surrounding these stars.
| Open Star Clusters | |||||
|---|---|---|---|---|---|
 M6 in Sco |
M7 in Sco |
 M11 in Sct |
 M18 in Sgr |
 M21 in Sgr |
|
 M23 in Sgr |
 M25 in Sgr |
 M26 in Sct |
 M29 in Cyg |
 M34 in Per |
|
 M35 in Gem |
 M36 in Aur |
 M37 in Aur |
 M38 in Aur |
 M39 in Cyg |
|
 M41 in CMa |
 M44 in Cnc |
 M45 in Tau |
 M46 in Pup |
 M47 in Pup |
|
 M48 in Hyd |
 M50 in Mon |
 M52 in Cas |
 M67 in Cnc |
 M73 in Aqr |
|
M93 in Pup |
 M103 in Cas |
||||
 Cr 399 in Vul |
|||||
 IC 1805 / Mel 15 in Cas |
 IC 2157 in Gem |
 IC 4665 in Oph |
 IC 4756 in Ser |
||
 NGC 110 in Cas |
 NGC 129 in Cas |
 NGC 188 in Cep |
 NGC 225 in Cas |
 NGC 457 in Cas |
|
 NGC 663 in Cas |
 NGC 752 in And |
 NGC 869 in Per |
 NGC 884 in Per |
 NGC 869/884 in Per |
|
 NGC 957 in Per |
 NGC 1027 in Cas |
 NGC 1245 in Per |
 NGC 1342 in Per |
 NGC 1502 in Cam |
|
 NGC 1528 in Per |
 NGC 1647 in Tau |
 NGC 1977 in Ori |
 NGC 1981 in Ori |
||
 NGC 2239 in Mon |
NGC 2244 in Mon |
 NGC 2281 in Aur |
 NGC 2301 in Mon |
 NGC 2331 in Gem |
|
 NGC 6633 in Oph |
|||||
 NGC 6791 in Lyr |
 NGC 6811 in Cyg |
 NGC 6823 in Vul |
 NGC 6871 in Cyg |
||
 NGC 6882 in Vul |
 NGC 6883 in Cyg |
NGC 6885 in Vul |
|||
 NGC 6939 in Cep |
 NGC 6940 in Vul |
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 NGC 7039 in Cyg |
 NGC 7082 in Cyg |
 NGC 7209 in Lac |
 NGC 7243 in Lac |
||
 NGC 7686 in And |
 NGC 7789 in Cas |
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