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 \pm 0.78 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 .