  The first known asteroid with the orbit inside that of Venus is
2020~AV$_{2}$. This may be the largest member of a new population of small
bodies with the aphelion smaller than 0.718~au, called Vatiras. The surface of
2020~AV$_{2}$ is being constantly modified by the high temperature, by the
strong solar wind irradiation that characterizes the innermost region of the
Solar system, and by high-energy micrometeorite impacts. The study of its
physical properties represents an extreme test-case for the science of
near-Earth asteroids. Here, we report spectroscopic observations of
2020~AV$_{2}$ in the 0.5-1.5~$\mu m$ wavelength interval. These were performed
with the Nordic Optical Telescope and the William Herschel Telescope. Based on
the obtained spectra, we classify 2020~AV$_{2}$ as a Sa-type asteroid. We
estimate the diameter of this Vatira to be $1.50_{-0.65}^{+1.10}$ km by
considering the average albedo of A-type and S-complex asteroids
($p_V=0.23_{-0.08}^{+0.11}$), and the absolute magnitude (H=$16.40\pm0.78$
mag). The wide spectral band around 1~$\mu m$ shows the signature of an olivine
rich composition. The estimated band centre $BIC = 1.08 \pm 0.02~\mu m$
corresponds to a ferroan olivine mineralogy similar to that of brachinite
meteorites.
