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2
RCW 108 is a star-forming H II region in Ara about 4,000 light-years away, including the Rim Nebula NGC 6188 and cluster NGC 6193.
3
RCW 124 is NGC 6302, the Bug or Butterfly Nebula in Scorpius, notable for a very hot central star detected by Hubble in 2009.
4
RCW 153 is Sh2-37 or IC 1284, a Sagittarius emission nebula near the galactic center line, with active star formation and radio source W 34.
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RCW 58 is a Wolf-Rayet nebula around WR 40, notable for a dusty ring-like structure modeled in 2021 as about 2.5 solar masses of gas.
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RCW 104 is a southern Milky Way H-alpha emission region listed in the 1960 Rodgers, Campbell and Whiteoak catalog of southern nebulae.
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