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Distance determinations of extremely-low-surface-brightness galaxies areexpensive in terms of spectroscopic time. Because of this, their distances areoften inferred by associating such galaxies with larger structures such asgroups or clusters, leading to a systematic bias by selecting objects in highdensity environments. Here we report the discovery of a red ultra-diffusegalaxy (S82-DG-1: $r_{\mathrm{eff}}$ = 1.6 kpc; $<\mu _{g}>$ = 25.7 magarcsec$^{-2}$; $g-i$ = 0.78 mag) located in a nearby cosmic void. We usedmulti-band luminosity functions of its globular clusters to obtain the distanceto S82-DG-1, at 28.7$_{-3.6}^{+4.2}$ Mpc. Follow-up deep spectroscopy with theGTC telescope yields a redshift of 3353 $\pm$ 29 km s$^{-1}$, making itsassociation with the NGC 1211 galaxy (one of the most isolated galaxies known)highly likely. Both galaxies have compatible distances and redshifts, share ahigh peculiar velocity ($\sim$1000 km s$^{-1}$) and lie within a void of radius7 Mpc. The local surface density is $\Sigma_5 \sim 0.06$ Mpc$^{-2}$, an orderof magnitude smaller than the field population and similar to the voids foundin the GAMA survey. Our work shows: i) The high potential of using opticalground-based photometry of associated globular clusters to explore distances toultra-diffuse galaxies and ii) the presence of red ultra-diffuse galaxies evenin the most sparse environments, suggesting a wide range of formationmechanisms.

Discovery of a red ultra-diffuse galaxy in a nearby void based on its globular cluster luminosity function