Limiting Magnitudes of the Wide Field Survey Telescope (WFST)

Expected to be of the highest survey power telescope in northern hemisphere, Wide Field Survey Telescope (WFST) will begin its routine observations sky since 2023. WFST produce a lot scientific data support researches time-domain astronomy, asteroids and solar system, galaxy formation cosmology so on. We estimated that 5 $\sigma$ limiting magnitudes with 30 second exposure are $u=22.31$ mag, $g=23.42$ $r=22.95$ $i=22.43$ $z=21.50$ $w=23.61$ mag. The above values calculated for conditions $airmass=1.2$, seeing = 0.75 arcsec, precipitable water vapour (PWV) 2.5 mm Moon-object separation $45^{\circ}$ at darkest New Moon night Lenghu site (V=22.30 phase $\theta=0^{\circ}$). different also calculated. calculations based on empirical transmittance optics, vendor provided CCD quantum efficiency, atmospherical model spectrum site. In absence measurement such as spectrum, we use data.