description RCW 121 Overview
help RCW 121 FAQ
What is RCW 121 also called?
RCW 121 is also designated Sh 2-4. It is a small H II region in Scorpius, meaning a cloud of ionized hydrogen where star formation is occurring.
Which catalog includes RCW 121?
RCW 121 appears in the 1960 catalog compiled by Rodgers, Campbell, and Whiteoak. That catalog records southern nebulae visible in H-alpha light.
Where is RCW 121 located?
RCW 121 is located in the constellation Scorpius. Its identification as Sh 2-4 links it to the Sharpless catalog of emission nebulae.
What kind of object is RCW 121?
RCW 121 is an H II region rather than a planet, star, or galaxy. Its glow comes from ionized gas, especially hydrogen emitting strongly at the H-alpha wavelength.
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