The Distance and Dynamical History of the Virgo Cluster Ultradiffuse Galaxy VCC 615

We use deep Hubble Space Telescope imaging to derive a distance the Virgo Cluster ultradiffuse galaxy (UDG) VCC 615 using tip of red giant branch (TRGB) estimator. detect 5,023 stars within galaxy, down 50% completeness limit F814W = 28.0, counts in surrounding field correct for contamination due background sources and intracluster stars. an extinction-corrected magnitude $m_{\rm tip,0} 27.19^{+0.07}_{-0.05}$, yielding $d=17.7^{+0.6}_{-0.4}$ Mpc. This places on far side ($d_{\rm Virgo} 16.5 Mpc$), at Virgocentric 1.3 Mpc near virial radius main body Virgo. Coupling this with galaxy's observed radial velocity, we find that is outbound trajectory, having survived recent passage through inner parts cluster. Indeed, our orbit modeling gives chance passed inside core (r<620 kpc) past Gyr, although very close passages directly cluster center (r<200 are unlikely. Given 615's undisturbed morphology, argue has experienced no sudden transformation into UDG potential, but rather long-lived whose relatively wide large dynamical mass protect it from stripping destruction by tides. Finally, also describe serendipitous discovery nearby dwarf projected 90 arcseconds (7.2 away 615.