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Sakowska, J.D. Simon, J.L. Carlin, L. Santana-Silva, M. Adam\\'ow, M. Geha, M. Navabi, N.E.D. No\\\"el, N.F. Sherman, O.Y. Gnedin, P. Massana, P.S. Ferguson, S. Mau, T.S. Li, V.M. Placco, W. Cerny, Y. Choi","submitted_at":"2024-10-01T18:10:15Z","abstract_excerpt":"We present the discovery of Aquarius III, an ultra-faint Milky Way satellite galaxy identified in the second data release of the DECam Local Volume Exploration (DELVE) survey. Based on deeper follow-up imaging with DECam, we find that Aquarius III is a low-luminosity ($M_V = -2.5^{+0.3}_{-0.5}$; $L_V = 850^{+380}_{-260} \\ L_{\\odot}$), extended ($r_{1/2} = 41^{+9}_{-8}$ pc) stellar system located in the outer halo ($D_{\\odot} = 85 \\pm 4$ kpc). 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