Opposition effect of M-type asteroids
Slyusarev I.G. Shevchenko V.G. Belskaya I.N. Krugly Y.N. Chiorny V.G. Mikhalchenko O.I. Inasaridze R.Y. Ayvaczian V.V. Zhuzhunadze V. Reva I.V. Omarov C.T. Kwiatkowski T. Oszkiewicz D. Troianskyi V. Skiff B.A. Maryeva O. Karpov S. Donchev Z.
June 2025Elsevier Ltd
Planetary and Space Science
2025#260
We present results of the observational program dedicated to search for possible diversity in opposition effect behavior of M-type asteroids. New photometric BVR observations were obtained for 10 asteroids, (325) Heidelberga, (382) Dodona, (558) Carmen, (639) Latona, (758) Mancunia, (789) Lena, (1046) Edwin, (1352) Wawel, (2582) Harimaya-Bashi, and (5615) Iskander. Five of these asteroids have diameters in the range from 5 to 40 km. For all of observed asteroids, we obtained lightcurves and magnitude-phase curves in a wide range of phase angles. We determined values of rotation periods and absolute magnitudes of these asteroids. With our new data, we doubled the number of M-type asteroids with measured opposition effect and for the first time observed opposition effect of M-type asteroids less than 40 km in diameter. We found that three asteroids, (558) Carmen, (789) Lena and (5615) Iskander, exhibit lower values of opposition effect compared to other measured M- and S-type asteroids but the slope of the linear part of the phase curve is typical for moderate-albedo surfaces. A possible explanation of their lower opposition effect is an assumption of a higher metal content on their surfaces as compared to other asteroids.
Asteroids , Photometry , Rotation , Spectrophotometry
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V.N. Karazin Kharkiv National University, 4 Svobody sq., Kharkiv, 61022, Ukraine
E. Kharadze Georgian National Astrophysical Observatory, Abastumani, 0301, Georgia
Samtskhe-Javakheti State University, Rustaveli Street 113, Akhaltsikhe, 0080, Georgia
Fesenkov Astrophysical Institute, 23 Observatory, Almaty, 050020, Kazakhstan
Astronomical Observatory Institute, Faculty of Physics and Astronomy, A. Mickiewicz University, Słoneczna 36, Poznan, 60-286, Poland
Department of Physics and Methods of Teaching, Faculty of Physics and Technology, Vasyl Stefanyk Precarpathian National University, Shevchenko Street 57, Ivano-Frankivsk, 76000, Ukraine
Astronomical Observatory of Odesa I. I. Mechnikov National University, Marazliivska 1v, Odesa, 65014, Ukraine
Lowell Observatory, 1400 West Mars Hill Rd, Flagstaff AZ, 86001, United States
Astronomical Institute of the Czech Academy of Sciences, Fricova 298, Ondrejov, 25165, Czech Republic
Institute of Physics of the Czech Academy of Sciences, Prague, CZ-182 21, Czech Republic
Institute of Astronomy and NAO, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Blvd., Sofia, 1784, Bulgaria
V.N. Karazin Kharkiv National University
E. Kharadze Georgian National Astrophysical Observatory
Samtskhe-Javakheti State University
Fesenkov Astrophysical Institute
Astronomical Observatory Institute
Department of Physics and Methods of Teaching
Astronomical Observatory of Odesa I. I. Mechnikov National University
Lowell Observatory
Astronomical Institute of the Czech Academy of Sciences
Institute of Physics of the Czech Academy of Sciences
Institute of Astronomy and NAO
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