J/A+A/686/A107 Recovering the orbits of known PHAs (Kovacova, 2024)
Re-examination of transportation abilities of 5:2 MMR with Jupiter.
Kovacova M.
<Astron. Astrophys. 686, A107 (2024)>
=2024A&A...686A.107K 2024A&A...686A.107K (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Minor planets
Keywords: chaos - instabilities - methods: numerical -
meteorites, meteors, meteoroids - minor planets, asteroids: general
Abstract:
Resonances in the main asteroid belt play a significant role in the
dynamical evolution of small bodies. They are capable of driving
objects into the near-Earth object (NEO) region as well.
This work re-examines the transportation abilities of the 5:2 mean
motion resonance (MMR) with Jupiter. We focus on a greater portion of
the resonance than the previous study that used a similar method. We
are also interested in an elimination course along q∼0.26au that was
discovered previously. Moreover, we search for the orbits of
potentially hazardous asteroids (PHAs) have and for orbits that
correspond to recent L chondrite meteorites.
Firstly, short-term fast Lyapunov indicator maps of the 5:2 MMR were
computed in order to distinguish between stable and unstable orbits.
Then over 10000 unstable particles were selected and integrated for a
longer period of time, up to 10Myr, to reveal the transportation
abilities of the resonance.
During our simulation, 99.45% of test particles became NEOs, 9.43%
reached the orbit with a semi-major axis, a<1au, and over 27% of
particles migrated to low perihelion distances q<0.005au. In
addition, 92.8% of the particles entered the Hill sphere of the Earth
and over 97% reached an orbit at which we would classify them as
potentially hazardous if they were sufficiently large. However, our
simulation did not confirm ejections along q∼0.26au.
Our results suggest that there is some kind of discrepancy between
using the MERCURIUS integrator (REBOUND package) and the ORBIT9
integrator (OrbFit package). This subject is worth additional
examination.
Description:
In order to examine transportation abilities of the 5:2 MMR with
Jupiter we integrated 10080 test particles selected from the most
unstable regions of the resonance. Particles were integrated up to 10
Myr by MERCURIUS integrator (REBOUND package). Integrations were
stopped if the particle was ejected to hyperbolic orbit or to an orbit
with semi-major axis a>100 au. We also searched for the orbits of 2374
known PHAs among these particles. Test particles had to satisfy
criteria: |a-a_{PHA}|<0.1au, |e-e_{PHA}|<0.1 and |i-i_{PHA}|<3deg,
where (a_{PHA}, e_{PHA}, i_{PHA}) are orbital elements corresponding
to specific PHA. For each PHA the designation, total number and
percentage of particles recovering the orbit of PHA and orbital
elements of PHA for the epoch JD 2460200.5 are given. In the
simulation the Sun and all major planets were taken into account.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 82 2374 Total number and percentage of test particles that
recovered the orbits of PHAs and orbital elements
of PHAs
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See also:
B/astorb : Orbits of Minor Planets (Bowell+, 2014-)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Planet ? Asteroid number of PHA
9- 25 A17 --- Name Name of PHA
27- 36 A10 --- Design Preliminary designation PHA between brackets
38- 41 I4 --- N Total number of test particles recovering the
orbit of PHA
43- 47 F5.2 % Nfrac Fraction of test particles recovering the
orbit of PHA
49- 54 F6.3 AU a Semi-major axis (for epoch JD 2460200.5) (1)
56- 61 F6.4 --- e Eccentricity (JD 2460200.5) (1)
63- 68 F6.2 deg i Inclination (JD 2460200.5) (1)
70- 75 F6.2 deg omega Argument of perihelion (JD 2460200.5) (1)
77- 82 F6.2 deg Omega Longitude of ascending node (JD 2460200.5) (1)
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Note (1): Orbital elements of all PHAs were retrieved on October 12, 2023 from
JPL Small-Body Database (https://ssd.jpl.nasa.gov/tools/sbdb_ query.html)
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Acknowledgements:
Martina Kovacova, mkovacova(at)astro.sk
(End) Martina Kovacova [AI SAS, Slovakia], Patricia Vannier [CDS] 25-Mar-2024