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  • Farnocchia, DavideJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA (author)

(523599) 2003 RM: The Asteroid that Wanted to be a Comet

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • Institute of Physics (IOP),2023
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:ltu-95863
  • https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-95863URI
  • https://doi.org/10.3847/PSJ/acb25bDOI

Supplementary language notes

  • Language:English
  • Summary in:English

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

Notes

  • Validerad;2023;Nivå 2;2023-03-15 (hanlid);Funder: National Aeronautics and Space Administration (80NM0018D0004 and NASA-80NSSC18K0853); National Science Foundation (AST-17152); NASA (80NSSC19K0444); NASA Goddard Space Flight Center (NNX17AL71A)
  • We report a statistically significant detection of nongravitational acceleration on the subkilometer near-Earth asteroid (523599) 2003 RM. Due to its orbit, 2003 RM experiences favorable observing apparitions every 5 yr. Thus, since its discovery, 2003 RM has been extensively tracked with ground-based optical facilities in 2003, 2008, 2013, and 2018. We find that the observed plane-of-sky positions cannot be explained with a purely gravity-driven trajectory. Including a transverse nongravitational acceleration allows us to match all observational data, but its magnitude is inconsistent with perturbations typical of asteroids such as the Yarkovsky effect or solar radiation pressure. After ruling out that the orbital deviations are due to a close approach or collision with another asteroid, we hypothesize that this anomalous acceleration is caused by unseen cometary outgassing. A detailed search for evidence of cometary activity with archival and deep observations from the Panoramic Survey Telescope and Rapid Response System and the Very Large Telescope does not reveal any detectable dust production. However, the best-fitting H2O sublimation model allows for brightening due to activity consistent with the scatter of the data. We estimate the production rate required for H2O outgassing to power the acceleration and find that, assuming a diameter of 300 m, 2003 RM would require Q(H2O) similar to 10(23) molec s(-1) at perihelion. We investigate the recent dynamical history of 2003 RM and find that the object most likely originated in the mid-to-outer main belt (similar to 86% probability) as opposed to from the Jupiter-family comet region (similar to 11% probability). Further observations, especially in the infrared, could shed light on the nature of this anomalous acceleration.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Seligman, Darryl Z.Department of Astronomy and Carl Sagan Institute, Cornell University, 122 Sciences Drive, Ithaca, NY, 14853, USA (author)
  • Granvik, MikaelLuleå tekniska universitet,Rymdteknik,Department of Physics, PO Box 64, FI-00014 University of Helsinki, Finland(Swepub:ltu)mikgra (author)
  • Hainaut, OlivierESO, Karl-Schwarzschild-Straße 2, D-85748 Garching-bei-München, Germany (author)
  • Meech, Karen J.Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA (author)
  • Micheli, MarcoESA NEO Coordination Centre, Largo Galileo Galilei, 1, I-00044 Frascati (RM), Italy (author)
  • Weryk, RobertPhysics and Astronomy, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada (author)
  • Chesley, Steven R.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA (author)
  • Christensen, Eric J.Lunar and Planetary Laboratory, University of Arizona, 1629 E University Boulevard, Tucson, AZ 85721, USA (author)
  • Koschny, DetlefESA NEO Coordination Centre, Via Galileo Galilei, 1, I-00044 Frascati (RM), Italy; ESA ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands; LRT, TU Munich, Boltzmannstraße 15, D-85748 Garching bei München, Germany (author)
  • Kleyna, Jan T.Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA (author)
  • Lazzaro, DanielaObservatório Nacional, R. Gen. José Cristino, 77, 20921-400 Rio de Janeiro, RJ, Brazil (author)
  • Mommert, MichaelSchool of Computer Science, University of St. Gallen, Rosenbergstrasse 30, CH-9000 St. Gallen, Switzerland (author)
  • Wainscoat, Richard J.Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA (author)
  • Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USADepartment of Astronomy and Carl Sagan Institute, Cornell University, 122 Sciences Drive, Ithaca, NY, 14853, USA (creator_code:org_t)

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  • In:The Planetary Science Journal: Institute of Physics (IOP)4:22632-3338

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