Physical characterization of 2020 AV2, the first known asteroid orbiting inside Venus orbit
| Autor: | C. Fariña, Ovidiu Vaduvescu, R. de la Fuente Marcos, Marcel Popescu, Eri Tatsumi, Viktoria Pinter, C. de la Fuente Marcos, L. Curelaru, Olga Zamora, Javier Licandro, J. de León |
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| Rok vydání: | 2020 |
| Předmět: |
Absolute magnitude
Solar System 010504 meteorology & atmospheric sciences FOS: Physical sciences Venus 01 natural sciences Nordic Optical Telescope 0103 physical sciences William Herschel Telescope 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) Physics biology Astronomy Astronomy and Astrophysics Albedo biology.organism_classification Astronomía Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Micrometeorite Asteroid Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | E-Prints Complutense. Archivo Institucional de la UCM instname E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid Monthly Notices of the Royal Astronomical Society |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | The first known asteroid with the orbit inside that of Venus is 2020~AV$_{2}$. This may be the largest member of a new population of small bodies with the aphelion smaller than 0.718~au, called Vatiras. The surface of 2020~AV$_{2}$ is being constantly modified by the high temperature, by the strong solar wind irradiation that characterizes the innermost region of the Solar system, and by high-energy micrometeorite impacts. The study of its physical properties represents an extreme test-case for the science of near-Earth asteroids. Here, we report spectroscopic observations of 2020~AV$_{2}$ in the 0.5-1.5~$\mu m$ wavelength interval. These were performed with the Nordic Optical Telescope and the William Herschel Telescope. Based on the obtained spectra, we classify 2020~AV$_{2}$ as a Sa-type asteroid. We estimate the diameter of this Vatira to be $1.50_{-0.65}^{+1.10}$ km by considering the average albedo of A-type and S-complex asteroids ($p_V=0.23_{-0.08}^{+0.11}$), and the absolute magnitude (H=$16.40\pm0.78$ mag). The wide spectral band around 1~$\mu m$ shows the signature of an olivine rich composition. The estimated band centre $BIC = 1.08 \pm 0.02~\mu m$ corresponds to a ferroan olivine mineralogy similar to that of brachinite meteorites. Comment: Accepted for publication in MNRAS. 10 pages, 5 figures |
| Databáze: | OpenAIRE |
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