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  • Fedorets, GrigoriAstrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK (author)

Establishing Earth's Minimoon Population through Characterization of Asteroid 2020 CD3

  • Article/chapterEnglish2020

Publisher, publication year, extent ...

  • 2020-11-23
  • Institute of Physics (IOP),2020
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:ltu-81767
  • https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81767URI
  • https://doi.org/10.3847/1538-3881/abc3bcDOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Validerad;2020;Nivå 2;2020-12-02 (alebob)
  • We report on our detailed characterization of Earth's second known temporary natural satellite, or minimoon, asteroid 2020 CD3. An artificial origin can be ruled out based on its area-to-mass ratio and broadband photometry, which suggest that it is a silicate asteroid belonging to the S or V complex in asteroid taxonomy. The discovery of 2020 CD3 allows for the first time a comparison between known minimoons and theoretical models of their expected physical and dynamical properties. The estimated diameter of (+0.4, -0.2) m and geocentric capture approximately a decade after the first known minimoon, 2006 RH120, are in agreement with theoretical predictions. The capture duration of 2020 CD3 of at least 2.7 yr is unexpectedly long compared to the simulation average, but it is in agreement with simulated minimoons that have close lunar encounters, providing additional support for the orbital models. 2020 CD3's atypical rotation period, significantly longer than theoretical predictions, suggests that our understanding of meter-scale asteroids needs revision. More discoveries and a detailed characterization of the population can be expected with the forthcoming Vera C. Rubin Observatory Legacy Survey of Space and Time.

Subject headings and genre

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  • Micheli, MarcoESA NEO Coordination Centre, Largo Galileo Galilei, 1, I-00044 Frascati (RM), Italy. INAF—Osservatorio Astronomico di Roma, Via Frascati, 33, I-00040 Monte Porzio Catone (RM), Italy (author)
  • Jedicke, RobertUniversity of Hawai'i, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA (author)
  • Naidu, Shantanu P.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA (author)
  • Farnocchia, DavideJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA (author)
  • Granvik, MikaelLuleå tekniska universitet,Rymdteknik,Department of Physics, P.O. Box 64, FI-00014, University of Helsinki, Finland(Swepub:ltu)mikgra (author)
  • Moskovitz, NicholasLowell Observatory, 1400 W Mars Hill Road, Flagstaff, AZ 86001, USA (author)
  • Schwamb, Megan E.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK (author)
  • Weryk, RobertUniversity of Hawai'i, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA (author)
  • Wierzchoś, KacperThe University of Arizona, Lunar and Planetary Laboratory, 1629 E. University Boulevard, Tucson, AZ 85721, USA (author)
  • Christensen, EricThe University of Arizona, Lunar and Planetary Laboratory, 1629 E. University Boulevard, Tucson, AZ 85721, USA (author)
  • Pruyne, TheodoreThe University of Arizona, Lunar and Planetary Laboratory, 1629 E. University Boulevard, Tucson, AZ 85721, USA (author)
  • Bottke, William F.Department of Space Studies, Southwest Research Institute, 1050 Walnut Street, Suite 300, Boulder, CO 80302, USA (author)
  • Ye, QuanzhiDepartment of Astronomy, University of Maryland, College Park, MD 20742, USA (author)
  • Wainscoat, RichardUniversity of Hawai'i, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA (author)
  • Devogèle, MaximeLowell Observatory, 1400 W Mars Hill Road, Flagstaff, AZ 86001, USA. Arecibo Observatory, University of Central Florida, HC-3 Box 53995, Arecibo, PR 00612, USA (author)
  • Buchanan, Laura E.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK (author)
  • Djupvik, Anlaug AmandaNordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Santa Cruz de Tenerife, Spain (author)
  • Faes, Daniel M.Gemini Observatory/NSF's NOIRLab, 670 N. A'ohoku Place, Hilo, HI 96720, USA (author)
  • Föhring, DoraUniversity of Hawai'i, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA (author)
  • Roediger, JoelNational Research Council of Canada, Herzberg Astronomy and Astrophysics Research Centre, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada (author)
  • Seccull, TomGemini Observatory/NSF's NOIRLab, 670 N. A'ohoku Place, Hilo, HI 96720, USA (author)
  • Smith, Adam B.Gemini Observatory/NSF's NOIRLab, 670 N. A'ohoku Place, Hilo, HI 96720, USA (author)
  • Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKESA NEO Coordination Centre, Largo Galileo Galilei, 1, I-00044 Frascati (RM), Italy. INAF—Osservatorio Astronomico di Roma, Via Frascati, 33, I-00040 Monte Porzio Catone (RM), Italy (creator_code:org_t)

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  • In:Astronomical Journal: Institute of Physics (IOP)160:60004-62561538-3881

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