Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.403.1834c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 403, Issue 4, pp. 1834-1848.
Astronomy and Astrophysics
Astronomy
5
Celestial Mechanics, Minor Planets, Asteroids
Scientific paper
In a previous paper, the current state of knowledge of the region containing the Phocaea dynamical family was revised. Here, the dynamical evolution and possible origin of the Phocaea dynamical family and asteroid groups in the region are investigated. First, I study the case of asteroids at high eccentricity (e > 0.31). I find that these objects are unstable because of encounters with Mars on time-scales of up to 270Myr. The minimum time needed by members of the Phocaea classical family to reach the orbital locations of these objects, 370Myr, can be used to set a lower limit on the age of the Phocaea family.
Next, attention is focused on the chaotic layer previously identified near the ν6 secular resonance border. Using analytical and numerical tools, I find that the presence of the ν6 secular resonance forces asteroids with |g - g6| < 2.55arcsecyr-1 to reach eccentricities high enough to allow them to experience deep, close encounters with Mars. Results of the analytical model of Yoshikawa and of my numerical simulations fully explain the low-inclination chaotic region found by Carruba.
Finally, I investigate the long-term stability of the minor families and clumps identified in the previous paper, with particular emphasis on a clump only identifiable in the domain of proper frequencies (n, g, g - s) around (6246) Komurotoru. I find that while the clumps identified in the space of proper elements quickly disperse when the Yarkovsky effect is considered, the family around (19536) is still observable for time-scales of more than 50Myr. The (6246) clump, characterized by its interaction with the ν5 + ν16 and 2ν6 - ν16 secular resonances, is robust on time-scales of 50Myr. I confirm that this group may be the first clump ever detected in the frequency domain that can be associated with a real collisional event.
No associations
LandOfFree
Dynamical erosion of asteroid groups in the region of the Phocaea family does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dynamical erosion of asteroid groups in the region of the Phocaea family, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamical erosion of asteroid groups in the region of the Phocaea family will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1178444