ИСТИНА

Using the 2-m telescope with a CCD-spectrometer (working in the range of 0.35-0.97 μm with R ≈ 100 re-solving power) of Terskol Observatory operated by IA RAS, we performed in September 2012 spectrophotome-try of (145) Adeona, (704) Interamnia, (779) Nina, and (1474) Beira to specify mineralogy of the asteroid sur-face matter. According to widely used classifications [1-3], Adeona is of C or Ch type, Interamnia – of F or B, Nina – of M or X, and Beira – of FX or B. Values of their geometric albedos are in the same order: 0.06, 0.08, 0.16, and unknown one from the WISE-data [4]. Despite of previously debuted high-temperature mineralogy of Nina, its radar-observations showed that the body is of a primitive type [5]. Comparing reflectance spectra of the asteroids with their spectra obtained by others, we discovered an unusual shape of Adeona’s, Interamnia’s, and Nina’s spectra manifesting itself in a considerable growth of spectral reflectivity predominantly in the range ~0.4-0.6 μm. Given the lack of such a feature in reflectance spectra of other asteroids observed at the observa-tory, with the same facility, closely in time and at similar atmospheric conditions, we suspected its belonging to just the bodies.