How many stars are in the constellation Musca?
Musca
Located on the border with Circinus is the unusual planetary nebula NGC 5189,[8] estimated to be around 1750light-years away from Earth.[58] Its complex structure is due to multiple ejections of material from the ageing central star, which are distorted by the presence of a likely binary companion.[59] Located 2.4° east of Eta Muscae is the magnitude-12.9 Engraved Hourglass Nebula (MyCn18),[60] which lies about 8000 light-years distant from Earth.[61] To Eta's west lies IC 4191, a compact bluish planetary nebula of magnitude 10.6,[62] thought to lie around 10,750 light-years away from Earth.[63] West of Epsilon Muscae is NGC 4071, a large, diffuse planetary nebula of magnitude 12.7 with a magnitude 12 central star,[62] thought to lie around 4000 light-years away from Earth.[63] The Coalsack Nebula is a dark nebula located mainly in neighbouring Crux that intrudes into Musca.[64] NGC 4463 is an open cluster located on its southwestern border.[65] Around five light-years across, it is located around 3400 light-years away.[12]