TW Hydrae b
TW Hydrae b is a likely extrasolar planet orbiting the young T Tauri star TW Hydrae approximately 176 light-years ( 54 parsecs , or nearly km ) away in the constellation of Hydra . 
<triplet> TW Hydrae b <subj> extrasolar planet <obj> instance of <subj> Hydra <obj> constellation <triplet> TW Hydrae <subj> TW Hydrae b <obj> child astronomical body <triplet> Hydra <subj> constellation <obj> instance of