SPECTROPHOTOMETRIC STUDIES OF ASTEROIDS I: REFLECTANCE SPECTRA

G.K. Aimanova; A.V. Serebryanskiy; M.P. Shcherbina; M.A. Krugov

doi:10.31489/2025N2/133-146

Authors

DOI:

https://doi.org/10.31489/2025N2/133-146

Keywords:

spectrophotometry, asteroids, reflectance spectra, Gaia DR3

Abstract

The paper presents the results of the analysis of the reflectivity spectra of asteroids based on observations obtained on 2024-02-22, 2023-11-03, 2023-11-04 and 2023-11-21 at the Assy-Turgen Observatory (77°.87114 E, 43°.225527 N, 2658 meters above sea level, international observatory code 217) using a long-slit spectrograph based on volume-phase holographic gratings (VPHG) installed at the prime focus of the AZT-20 telescope with an aperture of 1.5 meters. The observations were carried out in the low-resolution mode (R=600) in the range of 3500-7500Å using a grating of 360 lines per mm, a dispersion of 4.25Å per pixel, in the first binning in the EMCCD mode with a gain of 5 and an exposure time of 10 seconds, the slit width of 9 arc seconds. The spectrum of asteroids was measured using the differential method: by comparing the fluxes from the object and a standard star. Solar analog stars (G-class stars) were used as standards. Processing and calculation of reflectance spectra, alongside the determination of taxonomic classification according to the Tholen and SMASSII systems, based on spectral morphology and selected spectral characteristics, were conducted for a sample of 19 asteroids, primarily consisting of Main Belt members (14). A comparison was made with the spectra of asteroids based on INASAN observations in 2013–2017 and the reflectivity spectra of asteroids obtained from Gaia (DR 3) observations, and their taxonomic types were determined without taking into account the albedo of the asteroids.

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SPECTROPHOTOMETRIC STUDIES OF ASTEROIDS I: REFLECTANCE SPECTRA