Publication: Physical characterization of 2020 AV2, the first known asteroid orbiting inside Venus orbit
Loading...
Official URL
Full text at PDC
Publication Date
2020
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
The first known asteroid with the orbit inside that of Venus is 2020 AV2. 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 AV2 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 AV2 in the 0.5–1.5-μm wavelength interval. These were performed with the Nordic Optical Telescope and the William Herschel Telescope. Based on the obtained spectra, we classify 2020 AV2 as a Sa-type asteroid. We estimate the diameter of this Vatira to be 1.50+1.10−0.65 km by considering the average albedo of A-type and S-complex asteroids (pV=0.23+0.11−0.08), and the absolute magnitude (H = 16.40 ± 0.78 mag). The wide spectral band around 1 μm shows the signature of an olivine-rich composition. The estimated band centre BIC = 1.08 ± 0.02 μm corresponds to a ferroan olivine mineralogy similar to that of brachinite meteorites.
Description
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society
UCM subjects
Unesco subjects
Keywords
Citation
Akhlaghi M., Ichikawa T., 2015, ApJS, 220, 1
Bacci P., et al., 2020, Minor Planet Electronic Circulars, 2020-A99
Binzel R. P., et al., 2010, Nature, 463, 331
Binzel R. P., et al., 2019, Icarus, 324, 41
Bott N., Doressoundiram A., Zambon F., Carli C., Guzzetta L., Perna D., Capaccioni F., 2019, Journal of Geophysical Research (Planets), 124, 2326
Burbine T. H., Meibom A., Binzel R. P., 1996, Meteoritics and Planetary Science, 31, 607
Burbine T. H., Buchanan P. C., Dolkar T., Binzel R. P., 2009, Meteoritics and Planetary Science, 44, 1331
Burns R. G., 1993, Mineralogical Applications of Crystal Field Theory
Bus S. J., Binzel R. P., 2002, Icarus, 158, 146
Carry B., Solano E., Eggl S., DeMeo F. E., 2016, Icarus, 268, 340
Cloutis E. A., Gaffey M. J., Jackowski T. L., Reed K. L., 1986, J. Geophys. Res., 91, 11,641
DeMeo F. E., Binzel R. P., Slivan S. M., Bus S. J., 2009, Icarus, 202, 160
DeMeo F. E., Alexander C. M. O., Walsh K. J., Chapman C. R., Binzel R. P., 2015, The Compositional Structure of the Asteroid Belt. pp 13–41, doi:10.2458/azu_uapress_9780816532131-ch002
DeMeo F. E., Polishook D., Carry B., Burt B. J., Hsieh H. H., Binzel R. P., Moskovitz N. A., Burbine T. H., 2019, Icarus, 322, 13
Delbo M., et al., 2014, Nature, 508, 233
Devogèle M., et al., 2019, AJ, 158, 196
Dunn T. L., McCoy T. J., Sunshine J. M., McSween H. Y., 2010, Icarus, 208, 789
Eaton J. W., Bateman D., Hauberg S., Wehbring R., 2018, GNU Octave version 4.4.0 manual: a high-level interactive language for numerical computations. https://www.gnu.org/software/octave/doc/v4.4.1/
Gaffey M. J., Bell J. F., Brown R. H., Burbine T. H., Piatek J. L., Reed K. L., Chaky D. A., 1993, Icarus, 106, 573
Giorgini J. D., 2015, in IAU General Assembly. p. 2256293
Granvik M., et al., 2016, Nature, 530, 303
Granvik M., et al., 2018, Icarus, 312, 181
Greenstreet S., 2020, MNRAS, 493, L129
Greenstreet S., Ngo H., Gladman B., 2012, Icarus, 217, 355
Hasegawa S., Hiroi T., Ohtsuka K., Ishiguro M., Kuroda D., Ito T., Sasaki S., 2019, PASJ, 71, 103
Hutchison R., 2004, Meteorites King T. V. V., Ridley W. I., 1987, J. Geophys. Res., 92, 11457
Kozai Y., 1962, AJ, 67, 591
Lidov M. L., 1962, Planet. Space Sci., 9, 719
Mainzer A., et al., 2011, ApJ, 741, 90
Milliken R. E., Hiroi T., Patterson W., 2016, in Lunar and Planetary Science Conference. p. 2058
Mittlefehldt D. W., Bogard D. D., Berkley J. L., Garrison D. H., 2003, Meteoritics and Planetary Science, 38, 1601
Perna D., et al., 2018, Planet. Space Sci., 157, 82
Pieters C. M., Hiroi T., 2004, in Mackwell S., Stansbery E., eds, Lunar and Planetary Inst. Technical Report Vol. 35, Lunar and Planetary Science Conference.
Popescu M., et al., 2016, A&A, 591, A115
Popescu M., et al., 2018a, MNRAS, 477, 2786
Popescu M., Licandro J., Carvano J. M., Stoicescu R., de León J., Morate D., Boaca I. L., Cristescu C. P., 2018b, A&A, 617, A12
Popescu M., et al., 2019, A&A, 627, A124
Pravec P., Harris A. W., 2007, Icarus, 190, 250
Reddy V., Nathues A., Gaffey M. J., Schaeff S., 2011, Planet. Space Sci., 59, 772
Ryan E. L., Woodward C. E., 2010, AJ, 140, 933
Sánchez J. A., Reddy V., Nathues A., Cloutis E. A., Mann P., Hiesinger H., 2012, Icarus, 220, 36
Sánchez J. A., et al., 2014, Icarus, 228, 288
Sharma I., Jenkins J. T., Burns J. A., 2006, Icarus, 183, 312
Stenborg G., Stauffer J. R., Howard R. A., 2018, ApJ, 868, 74
Sunshine J. M., Bus S. J., Corrigan C. M., McCoy T. J., Burbine T. H., 2007, Meteoritics and Planetary Science, 42, 155
Tatsumi E., et al., 2018, Icarus, 311, 175
Tody D., 1986, The IRAF Data Reduction and Analysis System. p. 733, doi:10.1117/12.968154
Vernazza P., Binzel R. P., Thomas C. A., DeMeo F. E., Bus S. J., Rivkin A. S., Tokunaga A. T., 2008, Nature, 454, 858
Vokrouhlický D., Bottke W. F., Chesley S. R., Scheeres D. J., Statler T. S., 2015, The Yarkovsky and YORP Effects. pp 509–531, doi:10.2458/azu_uapress_9780816532131-ch027
de León J., Duffard R., Licandro J., Lazzaro D., 2004, A&A, 422, L59
de León J., Licandro J., Serra-Ricart M., Pinilla-Alonso N., Campins H., 2010, A&A, 517, A23
de la Fuente Marcos C., de la Fuente Marcos R., 2019a, Research Notes of the American Astronomical Society, 3, 106
de la Fuente Marcos C., de la Fuente Marcos R., 2019b, MNRAS, 487, 2742
de la Fuente Marcos C., de la Fuente Marcos R., 2020, MNRAS, 494, L6
von Zeipel H., 1910, Astronomische Nachrichten, 183, 345