Accuracies of a few hundredths of magnitude are expected for stars of most spectral types of . When combined with the medium-band photometric measurements performed by the spectrometric instrument, paramenters such as the spectral class, effective temperature, surface gravity, metallicity, interstellar extinction and color excess will be determined for most observed objects. Distances and absolute magnitudes of objects whose parallax is too small to be measured astrometrically will also be obtained from photometric measurements. Median expected broad-band photometric precision for stars of different spectral types as function of magnitude. An extinction of was assumed.
Vertical lines indicate saturation of the CCD at bright stars.
The quoted figures are for the Astro-1.