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We present the discovery of NGTS J214358.5-380102, an eccentric M-dwarfbinary discovered by the Next Generation Transit Survey. The system period of7.618 days is greater than many known eclipsing M-dwarf binary systems. Itsorbital eccentricity of $0.323^{+0.0014}_{-0.0037}$, is large relative to theperiod and semi-major axis of the binary. Global modelling of photometry andradial velocities indicate stellar masses of $M_A$=$0.426^{+0.0056}_{-0.0049}$, $M_B$=$0.455 ^{+0.0058}_{-0.0052}$ and stellar radii$R_A$=$0.461 ^{+0.038}_{-0.025}$ $R_B$=$0.411 ^{+0.027}_{-0.039}$,respectively. Comparisons with stellar models for low mass stars show that onestar is consistent with model predictions whereas the other is substantiallyoversized. Spectral analysis of the system suggests a primary of spectral typeM3V, consistent with both modelled masses and radii, and with SED fitting ofNGTS photometry. As the most eccentric eclipsing M-dwarf binary known, NGTSJ214358.5-380102 provides an interesting insight into the strength of tidaleffects in the circularisation of stellar orbits.

NGTS J214358.5-380102 -- NGTS discovery of the most eccentric known eclipsing M-Dwarf binary system