[en] An observing campaign was conducted in the Southern Hemisphere using low-light video camera triangulation to measure the trajectories and orbits of meteoroids with a possible origin at asteroid Bennu. New CAMS (Camera for Allsky Meteor Surveillance) video camera networks were established in Australia, Chile, and Namibia, and networks in New Zealand and South Africa were expanded. During observing periods in September 2019, 2020, and 2021, we measured 7672, 4936, and 5890 orbits, respectively. Based on the non-detection of predicted meteoroid trail encounters, Bennu's meteoroid production rate was <1.5 kg/s during 1500-1800 CE. Indeed, the current production rate is many orders of magnitude lower. Bennu may have an associated annual meteoroid stream of much older ejecta at a particle flux density of ≤1.3 × 10^6 km^-2 h^-1, based on seven Bennu-like orbits detected during the first three years of observations.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Jenniskens, Peter; SETI Institute, 339 Bernardo Ave, Mountain View, CA 94043, USA
Lauretta, Dante S.; University of Arizona, Department of Planetary Sciences
Koelbel, Lindsey R.; University of Arizona, Department of Planetary Sciences
Brown, P., Weryk, R.J., Coordinated optical and radar measurements of low velocity meteors. Icarus, 352, 2020 id. 113975.
Chesley, S.R., French, A.S., Davis, A.B., Jacobson, R.A., Brozovic, M., Farnocchia, D., et al. Trajectory and estimation for particles observed in the vicinity of (101955) Bennu. JGR Planets, 125, 2020 article id. e2019JE006363.
Gural, P., Fully correcting for the spread in meteor radiant positions due to gravitational attraction. JIMO 29 (2000), 134–138.
Hergenrother, C.W., Adam, C.D., Chesley, S.R., Lauretta, D.S., Introduction to the special issue: exploration of the activity of asteroid (101955) Bennu. JGR Planets, 125, 2020 e2020JE006549.
Jacchia, L.G., Verniani, F., Briggs, R.E., An analysis of the atmospheric trajectories of 413 precisely reduced photographic meteors. Smiths. Contrib. Astrophys. 10 (1967), 1–139.
Jenniskens, P., Meteor Showers and their Parent Comets. 2006, Cambridge University Press, Cambridge 790 pp.
Jenniskens, P., Gural, P.S., Dynneson, L., Grigsby, B.J., Newman, K.E., Borden, M., Koop, M., Holman, D., CAMS: Cameras for Allsky Meteor Surveillance to establish minor meteor showers. Icarus 216 (2011), 40–61.
Jenniskens, P., Lauretta, D.S., Towner, M.C., Bland, P.A., Heathcote, S., Jehin, E., Hanke, T., Cooper, T., Baggaley, J., First results from an observing campaign to detect the meteoroids of Bennu at Earth. Asteroid Science in the Age of Hayabusa 2 and OSIRIS-REx, held 5-7 Nov., 2019, in Tucson, AZ. LPI Contr. No. 2189, ed. 2017, 2019.
Jenniskens, P., Lauretta, D.S., Towner, M.O., Heathcote, S., Jehin, J., Hanke, T., Cooper, T., Baggaley, J.W., Howell, J.A., Johannink, C., Breukers, M., Odeh, M., Moskovitz, N., Juneau, L., Beck, T., De Cicco, M., Samuels, D., Rau, S., Albers, J., Gural, P.S., Meteor showers from known long period comets. Icarus, 365, 2021 article id. 114469.
Kovácová, M., Nagy, R., Kornos, L., Tóth, J., 101955 Bennu and 162173 Ryugu: dynamical modelling of ejected particles to the Earth. Planet Space Sci., 185, 2020 article id. 104897.
Lindblad, B.A., 2. A computerized stream search among 2401 photographic meteor orbits. Smiths. Contr. Astrophys. 12 (1971), 14–24.
Maslov, M., website: http://feraj.ru/Radiants/Predictions/1901-2100eng/Finlayids1901-2100predeng.html. 2009 Last accessed 2021 Sept 30.
Melikyan, R.E., Clark, B.E., Hergenrother, C.W., Chesley, S.R., Noaln, M.C., Ye, Q.-Z., Lauretta, D.S., Bennu's natural sample delivery mechanism: estimating the flux of Bennuid meteors at Earth. JGR Planets, 126, 2021 article id. e2021JE006917.
Moorhead, A.V., Performance of D-criteria in isolating meteor showers from the sporadic background in an optical data set. Mon. Not. R. Astron. Soc. 455 (2016), 4329–4338.
Neslusan, L., Svoren, J., Proubcan, V., A computer program for calculation of a theoretical meteor-stream radiant. Astron. Astrophys. 331 (1998), 411–413.