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We report the discovery of the faintest known dwarf galaxy satellite of anLMC stellar-mass host beyond the Local Group, based on deep imaging withSubaru/Hyper Suprime-Cam. MADCASH J074238+652501-dw lies $\sim$35 kpc inprojection from NGC 2403, a dwarf spiral galaxy at $D$$\approx$3.2 Mpc. Thisnew dwarf has $M_{g} = -7.4\pm0.4$ and a half-light radius of $168\pm70$ pc, atthe calculated distance of $3.39\pm0.41$ Mpc. The color-magnitude diagramreveals no evidence of young stellar populations, suggesting that MADCASHJ074238+652501-dw is an old, metal-poor dwarf similar to low luminosity dwarfsin the Local Group. The lack of either detected HI gas ($M_{\rm HI}/L_{V} <0.69 M_\odot/L_\odot$, based on Green Bank Telescope observations) or $GALEX$NUV/FUV flux enhancement is consistent with a lack of young stars. This is thefirst result from the MADCASH (Magellanic Analog Dwarf Companions And StellarHalos) survey, which is conducting a census of the stellar substructure andfaint satellites in the halos of Local Volume LMC analogs via resolved stellarpopulations. Models predict a total of $\sim$4-10 satellites at least asmassive as MADCASH J074238+652501-dw around a host with the mass of NGC 2403,with 2-3 within our field of view, slightly more than the one such satelliteobserved in our footprint.

First results from the MADCASH Survey: A Faint Dwarf Galaxy Companion to the Low Mass Spiral Galaxy NGC 2403 at 3.2 Mpc