Mu Arae b sive HD 160691 b, nomine communi Quijote, est planeta extrasolaris, die 12 Decembris 2000 a Paulo Butler et Galfrido Marcy repertus, qui stellam Mu Arae (constellationis Arae), a nobis annis luce mensis fere 50 distantem, circumagitur. Planetae Mu Arae b periodus orbitalis 643.25 dierum reportatur, massa 1.676 massae Iovis.
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