Notable Objects
The soft X-ray transient Nova Muscae 1991 is a binary object consisting of a star and a black hole. During the 1991 outburst which led to its discovery, radiation was produced through a process of positron annihilation. Musca also contains the unusual planetary nebula NGC 5189, located about 3,000 light years from earth. Its uniquely complex structure resembles a miniature crab nebula. Also within the constellation is the Hourglass Nebula (MyCn 18) at a distance of about 8,000 light years. The comparatively old globular cluster NGC 4833 near Delta Muscae is 21,200 light years distant and somewhat obscured by dust clouds near the galactic plane. The globular cluster NGC 4372 near Gamma Muscae is fainter and likewise partially obscured by dust, but spans more arc minutes.
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