Ophiacus | Article about Ophiacus by The Free Dictionary
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Ophiuchus (of-ee-yoo -kŭs, oh-fee-) (Serpent Bearer) A large equatorial constellation near Scorpius, lying partly in the Milky Way. The brightest star is the 2nd-magnitude white giant Rasalhague (α), which lies close to Rasalgethi (Alpha [α] Herculis). The area contains the supernova remnant of Kepler's star, the Rho (ρ) Ophiuchi cloud, in which there is active star formation (see Rho Ophiuchi cloud), the loose open cluster IC 4665, and many globular clusters. Abbrev.: Oph; genitive form: Ophiuchi; approx. position: RA 17h, dec –7°; area: 948 sq deg.